Dr. Cheng Li

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====== My arXiv notes (since 2020) ======

===== 2022 =====

==== May ====

  * [[https://arxiv.org/abs/2205.09069|Influence of Magnetic Fields on the Gas Rotation in the Galaxy NGC6946]]
    * magnetic field causes an ascending rotation curve in the outer radii of the galaxy, by ~7-14 km/s
    * so magnetic field is not that important
  * [[https://arxiv.org/abs/2205.08799|A sparse regression approach for populating dark matter halos and subhalos with galaxies]] (the Durrum team)
    * interesting to compare with Yangyao's model
  * [[https://arxiv.org/abs/2205.08554|Resolving the HI in Damped Lyman-α systems that power star-formation]] (Nature)
  * [[https://arxiv.org/abs/2205.08552|A trail of dark matter-free galaxies from a bullet dwarf collision]] (Pieter van Dokkum, Nature)
  * [[https://arxiv.org/abs/2205.08543|CLEAR: The Evolution of Spatially Resolved Star Formation in Galaxies between 0.5≲z≲1.7 using Hα Emission Line Maps]]
    * Ha surface density relative to continuum surface density within 1kpc drops from z~1 to z~0.5. The authors attribute this to inside-out quenching in the wake of inside-out growth. Since galaxy size grows, the lower value at lower redshift could be a result of gradient but not evolution. The 1kpc radius covers out to the disc at z~1 but it is only the central region at lower redshift. Need to check the size-mass relation at different redshifts.
  * [[https://arxiv.org/abs/2205.08424|Galaxy cluster aperture masses are more robust to baryonic effects than 3D halo masses]]
  * [[https://arxiv.org/abs/2205.08241|How well do local relations predict gas-phase metallicity gradients? Results from SDSS-IV MaNGA]]
  * [[https://arxiv.org/abs/2205.08163|Cosmic-ray diffusion and the multi-phase interstellar medium in a dwarf galaxy. I. Large-scale properties and γ-ray luminosities]]
  * [[https://arxiv.org/abs/2205.07984|The Cosmic Large-Scale Structure in X-rays (CLASSIX) cluster survey IV: Superclusters in the local Universe at z <= 0.03]]
  * [[https://arxiv.org/abs/2205.07916|Simulating cold shear flows on a moving mesh]] (Volker Springel)
  * [[https://arxiv.org/abs/2205.07964|pdf, other]The Ages of Galactic Bulge Stars with Realistic Uncertainties]] Galactic bulge is truly old, with only a small fraction (15/91) of stars younger than 7 Gyr. The presence of a ~8Gyr population with high metallicity is reported.
  * [[https://arxiv.org/abs/2205.07911|Ghostly Stellar Haloes and their Relationship to Ultra-faint Dwarfs]]
  * [[https://arxiv.org/abs/2205.07913|Resolved stellar mass profiles of galaxies in the Hubble Frontier Fields]]
  * [[https://arxiv.org/abs/2205.07909|Starbursts with suppressed velocity dispersion revealed in a forming cluster at z=2.51]]
  * [[https://arxiv.org/abs/2205.07906|A simulated annealing approach to parameter inference with expensive likelihoods]]
  * [[https://arxiv.org/abs/2205.06347|SKYSURF: Constraints on Zodiacal Light and Extragalactic Background Light through Panchromatic HST All-Sky Surface-Brightness Measurements: II. First Limits on Diffuse Light at 1.25, 1.4, and 1.6 microns]]
  * [[https://arxiv.org/abs/2205.05731|High-resolution ALMA study of CO (2-1) line and dust continuum emissions in cluster galaxies at z = 1.46]]
  * [[https://arxiv.org/abs/2205.05698|VERTICO II: effects of HI-identified environmental mechanisms on molecular gas]]
  * [[https://arxiv.org/abs/2205.05258|Enhanced Star Formation Activity of Extreme Jellyfish Galaxies in Massive Clusters and the Role of Ram Pressure Stripping]]

==== January ====

  * [[https://arxiv.org/abs/2201.03137|The age gradients of galaxies in EAGLE: outside-in quenching as the origin of young bulges in cluster galaxies]]
  * [[https://arxiv.org/abs/2201.03112|The Sloan Digital Sky Survey Peculiar Velocity Catalogue]]
  * [[https://arxiv.org/abs/2201.02762|Optical Variability of Quasars with 20-Year Photometric Light Curves]]
  * [[https://arxiv.org/abs/2201.03138|Rapid turn-on of a luminous X-ray source in the candidate Lyman
  continuum emitting galaxy Tol 0440-381]]
  * [[https://arxiv.org/abs/2201.03152|Dust distributions in the Magellanic Clouds]]
  * [[https://arxiv.org/abs/2201.02650|The bulge masses of TDE host galaxies and their scaling with black hole mass]]
  * [[https://arxiv.org/abs/2201.03196|Star Formation Properties of Sloan Digital Sky Survey BOSS Void Galaxies in the Hyper Suprime-Cam Survey]]
  * [[https://arxiv.org/abs/2201.03479|Morphology of dark matter haloes beyond triaxiality]]
  * 

===== 2021 =====

==== November ====

  * [[https://arxiv.org/abs/2111.10080|HSC-XXL : Baryon budget of the 136 XXL Groups and Clusters]]
  * [[https://arxiv.org/abs/2111.10054|Accurate Photometry of Saturated Stars Using the Point-Spread-Function Wing Technique with Spitzer]]
  * [[https://arxiv.org/abs/2111.10036|Stellar populations in local AGNs: evidence for enhanced star formation in the inner 100pc]]
  * [[https://arxiv.org/abs/2111.09889|arXiv:2111.09889]] Multi-wavelength view of the BH of M87

==== October ====

  * [[https://arxiv.org/abs/2110.05202|arXiv:2110.05202]] The infrared-radio relation in the local universe
  * [[https://arxiv.org/abs/2110.04537|arXiv:2110.04537]] The evolution of the barred galaxy population in the TNG50 simulation
  * [[https://arxiv.org/abs/2110.04434|arXiv:2110.04434]]The galaxy size to halo spin relation of disk galaxies in cosmological hydrodynamical simulations. The size-spin relation is examined for 4 sets of hydro simulations, and found to be tight in the IllustrisTNG. It's interesting that different simulations give rise to very different relations. This is probably reflecting our poor knowledge about disk galaxy formation.
  * [[https://arxiv.org/abs/2110.04342|arXiv:2110.04342]] From Blue Cloud to Red Sequence: Evidence of Morphological Transition Prior to Star Formation Quenching
  * [[https://arxiv.org/abs/2110.04336|arXiv:2110.04336]] Late-transition vs smooth H(z) deformation models for the resolution of the Hubble crisis. They find that smooth H(z) deformation models perform worse than transition models.
  * [[https://arxiv.org/abs/2110.04314|arXiv:2110.04314]] A New Census of the 0.2< z <3.0 Universe, Part II: The Star-Forming Sequence. The resulting star-forming sequence has a low-mass slope near unity and a much flatter slope at higher masses, with a normalization 0.2−0.5 dex lower than typical inferences in the literature.
  * [[https://arxiv.org/abs/2110.04305|arXiv:2110.04305]] Rejuvenation triggers nuclear activity in nearby galaxies. The authors demonstrate that local AGN galaxies are not just a simple transition type between star-forming and quiescent galaxies as previously postulated.
  * [[https://arxiv.org/abs/2110.03856|arXiv:2110.03856]] Using the EAGLE simulations to elucidate the origin of disc surface brightness profile breaks as a function of mass and environment
  
  * [[https://arxiv.org/abs/2110.04226|arXiv:2110.04226]] A Cosmological Underdensity Does Not Solve the Hubble Tension

  * [[https://arxiv.org/abs/2110.03185|arXiv:2110.03185]] The star formation history of Andromeda I derived from long period variables. The SFR can be estimated from long-period variables. Result is consistent with our MaNGA study of low-mass galaxies (Shuang Zhou et al.) that have significant fraction of old populations, indicating early star formation or episodes of star formation.

  * [[https://arxiv.org/abs/2107.08634|arXiv:2107.08634]] When did the initial mass function become bottom-heavy? A nice theoretical paper studying the effect of stellar radiation on star formation. Introduction gives a nice review of the physical process in two extreme cases: modern (metal rich) star formation and primordial (metal poor) star formation.

===== 2020 =====

==== July ====

  * [[https://arxiv.org/abs/2007.09432|NGC 90: a hidden jelly-fish galaxy?]]

  * cosmic web, tidal field, and alignment:
    * [[https://arxiv.org/abs/2007.08345|arXiv:2007.08345]] The alignment of satellite systems with cosmic filaments in the SDSS DR12 by Peng Wang at AiP and collaborators.
    * [[https://arxiv.org/abs/2007.08344|arXiv:2007.08344]] A robust determination of halo environment in the cosmic field, by Peng Wang et al.

  * High-z galaxies:
    * [[https://arxiv.org/abs/2007.07992|arXiv:2007.07992]] SCUBA2 and Herschel/SPIRE selected sample of 185 high-z galaxies are displayed on the star forming main sequence, and 60% of them fall on the sequence. It is found the star formation efficiency depends on the epoch and intensity of the star formation burst --- the later the burst, the more intense the star formation.
    * [[https://arxiv.org/abs/2007.08384|arXiv:2007.08384]] The ALPINE-ALMA [CII] Survey: Obscured Star Formation Rate Density and Main Sequence of star-forming galaxies at z>4
      * The main sequence and sSFRs do not evolve significantly between z=4.5 and z=5.5.

  * Star formation history of galaxies:
    * [[https://arxiv.org/abs/2007.07905|arXiv:2007.07905]] Kroupa et al. found the current SFR of local galaxies may be higher than the average of the past SFH, a surprising result contradictory to the commonly-adopted tau model.
    * [[https://arxiv.org/abs/2007.07916|arXiv:2007.07916]] The authors examine the SFHs of simulated galaxies in current hydra-dynamical simulations and found diversity among models.

  * [[https://arxiv.org/abs/2007.07913|arXiv:2007.07913]] The role of mergers and fly-bys in driving the evolution of dwarf galaxies over cosmic time
    * Only a portion of interactions end with mergers for dwarf galaxies. Fly-bys contribute significantly to the star formation due to their preponderance compared to mergers.

  * [[https://arxiv.org/abs/2007.07413|arXiv:2007.07413]] A 16 deg^2 survey of emission-line galaxies at z<1.6 from HSC-SSP PDR2 and CHORUS
  * [[https://arxiv.org/abs/2007.05648|arXiv:2007.05648]] A successful search for intervening 21 cm HI absorption in galaxies at 0.4 < z <1.0 with the Australian Square Kilometre Array Pathfinder (ASKAP)
  * [[https://arxiv.org/abs/2007.05581|arXiv:2007.05581]] Dual supermassive black holes at close separation revealed by the Hyper Suprime-Cam Subaru Strategic Program
  * [[https://arxiv.org/abs/2007.05545|arXiv:2007.05545]] Dissecting and Modelling Galaxy Assembly Bias
  * [[https://arxiv.org/abs/2007.05544|arXiv:2007.05544]] Less than the sum of its parts: the dust-corrected Hα luminosity of star-forming galaxies explored at different spatial resolutions with MaNGA and MUSE

  * [[https://arxiv.org/abs/2007.04988|arXiv:2007.04988]] Predictions for galaxy populations at z>10 to be observed with JWST. Mock catalogs from the study are publicly available. 
  * [[https://arxiv.org/abs/2007.04987|arXiv:2007.04987]] Revealing the relation between black-hole growth and host-galaxy compactness among star-forming galaxies. The paper find the Sigma_1 is most closely related with SMBH accretion rate than M* and SFR.
  * [[https://arxiv.org/abs/2007.04996|arXiv:2007.04996]] GASP XXX. The spatially resolved SFR-Mass relation in stripping galaxies in the local universe
  * [[https://arxiv.org/abs/2007.05040|arXiv:2007.05040]] Damped Lyman-α absorbers and atomic hydrogen in galaxies: the view of the GAEA model. Semi-analytic modelling of CGM, might be related to Meng Jiacheng's project...
  * [[https://arxiv.org/abs/2007.05144|arXiv:2007.05144]] A Machine Learning Approach to the Census of Galaxy Clusters
  * [[https://arxiv.org/abs/2007.05484|arXiv:2007.05484]] SPIDERS: overview of the X-ray galaxy cluster follow-up and the final spectroscopic data release

==== May ====

  * Two papers on S0 galaxies:
    * [[https://arxiv.org/abs/2005.09383|arXiv:2005.09383]]: Star formation in outer rings of S0 galaxies. III. UGC 5936 -- an S0 with currently accreted satellite matter
      * Cold gas accretion from a satellite galaxy provide fuel for star formation in a ring-like structure in the S0 galaxy.
    * [[https://arxiv.org/abs/2005.09016|arXiv:2005.09016]]: The local universe in the era of large surveys. I. Spectral classification of S0 galaxies
      * Spectra of S0 galaxies can be classified into two classes: one dominated by absorption and one with emission lines. The latter class is about a quarter of the total population.

  * [[https://arxiv.org/abs/2005.08995|arXiv:2005.08995]]: Observing Correlations Between Dark Matter Accretion and Galaxy Growth: I. Recent Star Formation Activity in Isolated Milky Way-Mass Galaxies
    * Recent SFR of MW-mass galaxies is not correlated with fresh gas accretion of dark matter halos, implying other processes such as gas recycling dominate further galaxy growth.

  * [[https://arxiv.org/abs/2005.05991|arXiv:2005.05991]]: The globular cluster system mass-halo mass relation in the E-MOSAICS simulations. 
    * GC mass vs. stellar mass of the host galaxy leads to a correlation of GC mass with dark halo mass which is linear when halo mass exceeds 5x10^11 solar mass.

  * [[https://arxiv.org/abs/2005.05974|arXiv:2005.05974]]: SatGen: a semi-analytical satellite galaxy generator -- I. The model and its application to Local-Group satellite statistics, by Fangzhou Jiang et al.
  * [[https://arxiv.org/pdf/1908.07547.pdf|arXiv:1908.07547]]: BASILISK: Bayesian Hierarchical Inference of the Galaxy-Halo Connection using Satellite Kinematics–I. Method and Validation, by Frank van den Bosch et al.


  * [[https://arxiv.org/abs/2005.04894|arXiv:2005.04894]]: Redshift Evolution of Green Valley Galaxies in Different Environments from the Hyper Suprime-Cam Survey
  * [[https://arxiv.org/abs/2005.05184|arXiv:2005.05184]]: Three Mechanisms for Bar Thickening, by Sellwood

==== April ====

  * arXiv:2004.07846, The Angular Momentum of the Circumgalactic Medium in the TNG100 Simulation. Axis of the angular moment of galaxies with high angular moment is found to be aligned with the CGM with high angular moment, and the effect is seen only for low mass halos with halo mass below 1.0e12 solar mass.
  * arXiv:1911.11778, SPECULATOR, a fast tool for computing spectra and/or SEDs of galaxies from stellar population synthesis models.
  * arXiv:2004.06734, Eigengalaxies: describing galaxy morphology using principal components in image space

==== February ====

=== 20200206, Thursday ===

  * arXiv:2002.01484, hydro-dynamic simulations provide more evidence in support of the morphology quenching mechanism. Central spheroids are found to increase the gas velocity dispersion towards the galactic center, which increases the gravitational stability of the gas disc and thus suppresses fragmentation and star formation. The authors discover a pronounced relation between central stellar surface density and star formation rate. This paper is relevant to Jing Tao's current project.

==== January ====

=== 20200131, Friday ===

=== 20200130, Thursday ===

  * arXiv:2001.10547, a model is proposed to interpret the extended [CII] halos around z~6 galaxies. Basically, cooling outflows driven by supernovae can produce extended cool halos, but there is indication of additional energy input from AGN.

  * arXiv:2001.11024, **marked power spectrum is suggested to be more powerful than standard power spectrum in constraining cosmological parameters**, particularly the neutrino mass. This is both because cosmological neutrinos have their greatest influence in voids (these are the regions with the highest neutrino to dark matter density ratios), and because the marked power spectrum can be used to emphasize low-density regions over high-density regions.

  * arXiv:2001.11013, observations of stellar steams in MW are used to constrain both warm and fuzzy dark matter models. 

  * arXiv:2001.10686, Chandra study of AGN pairs selected from SDSS. The X-ray luminosity is found to increase with decreasing pair separation. 

  * arXiv:2001.10544, narrow-band Halpha survey at z~0.62 detects a total of 241 Halpha emitters. Halpha luminosity functions are presented.

  * arXiv:2001.10880, HST/STIS optical spectra were obtained for early-type stars with existing IUE UV spectra. The data are used to construct optical extinction curves. This papers identifies the so-called intermediate scale structure (ISS) in the curves.

=== 20200129, Wednesday ===

  * arXiv:2001.10023, the paper presents an overview of the basic properties and discuss the self similarity of the hot "atmospheres" permeating the gravitational halos from the scale of galaxies, through groups, to massive clusters. Might be relevant to Wu Xuany's current paper writing. 

  * arXiv:2001.10031, HST imaging data is used to study globular clusters around UDGs. The authors suggest the existence of two types of UDGs, one is GC-rich and one is GC-poor. A toy model is proposed in which GC-rich UDGs are "failed" galaxies in massive halos and GC-poor UDGs are similar to normal LSB dwarfs in less massive halos.

  * arXiv:2001.10018, high-z Lyalpha forest spectra of QSOs at 6<z<6.5 are used to study the IGM, and are compared with mock spectra from simulation.

  * arXiv:2001.09999, The BUFFALO HST Survey: the Beyond Ultra-deep Frontier Fields and Legacy Observations, will expand the existing Hubble Frontier Fields (HFF) around each of the six HFF clusters and flanking fields. BUFFALO data including mosaics, value-added catalogs and cluster mass distribution models will be released via MAST on a regular basis, as the observations and analysis are completed for the six individual clusters.

  * arXiv:2001.10527, lecture-turorial for teaching interferometry to Astro 101 students.

=== 20200128, Tuesday ===

  * arXiv:2001.09157, spatially resolved stellar mass-to-light ratio for M31 is derived from color-magnitude diagrams of resolved stars in the Panchromatic Hubble Andromeda Treasury (PHAT) survey. M*/L is found to be correlated with color for both optical (SDSS) and mid-infrared bands from WISE. The M*/L is also correlated with recent SFH.

  * arXiv:2001.09984, the paper presents **general hard X-ray and optical bolometric corrections**, based on analysis of ~1000 type 1 and type 2 AGN. 

  * arXiv:2001.09587, the ACT (Atacama Cosmology Telescope): SZ-based masses and dust emission from IR-selected cluster candidates in the SHELA survey.

  * arXiv:2001.09154, The star formation histories of 39 post-starburst galaxies at z~1, by V. Wild. Main conclusion is that a large fraction (40-90%) of the stellar mass of these galaxies is contributed by recent starburst in the last 1-1.5 Gyr.

  * Hubble constant:
    * arXiv:2001.09213, H0 measurement derived from Megamaser of nearby galaxies, independent of distance ladders and CMB. H0 = 73.9±3.0 km/s/Mpc independent  
    * arXiv:2001.09260, the paper finds that the assumption on the dark energy model does not significantly change the local distance ladder value of H0, with a maximum difference (ΔH0) between the inferred value for different models of 0.47 km/s/Mpc, i.e. a 0.6% shift in H0, significantly smaller than the observed tension.

  * arXiv:2001.09348, a probabilistic fibre-to-target assignment algorithm that takes into account spectrograph targeting constraints and is capable of dealing with multiple concurrent surveys. This algorithm is presented using the 4-metre Multi-Object Spectroscopic Telescope (4MOST) as an example.

=== 20200127, Monday ===

  * arXiv:2001.09110, the authors study the gri image of 155 face-on spiral galaxies from SDSS, aiming to study the dependence of spiral characteristics on host galaxy properties. One of the conclusions is that, for the vast majority of galaxies (86\%) they observe an increase of their arm width with galactocentric distance.

  * arXiv:2001.09073, Wenkai Hu et al. from NAOC uses a sample of ~1800 galaxies observed by WRST to obtain the local cosmic HI density parameter. 

  * arXiv:2001.09058, MUSE is used to obtain IFS for a quasar field at z=5.26, detecting HI+CIV absorption line systems out to 250kpc from galaxies at the same redshift. Strongest CIV systems are those that are closely aligned with galaxies in velocity space. Most metal poor systems lie in the most dense environments, implying gas infalling for the first time into star-forming groups at high redshifts. An extended Lyalpha nebula is also found in their sample.

  * arXiv:2001.08814, predictions for 21cm-galaxy cross-power spectrum, expected to be observed with SKA and future galaxy surveys.

  * arXiv:2001.08760, Voronoi volume function, the distribution of cell volumes in the Voronoi tessellation of any set of cosmological tracers (galaxies/haloes), is suggested to be a new probe of cosmology and galaxy evolution.

=== 20200124, Friday ===

  * arXiv:2001.08713, H0 tension is investigated by reconstructing H(z) in a cosmological-model-independent way, using BAO, Type Ia SN and gravitational lensing Time-Delay observations. The reconstructed H0 using SN Ia and BAO data are consistent with the Planck LCDM model. When gravitational lensing Time-delay is included, H0 increases mildly, with a ~2.5sigma discrepancy. Since the reconstructions are blind to the dark sectors at low z, Hubble tension is not likely to be solved by modifying the energy budget of the low-z universe. Capability of future surveys like DESI and LSST are discussed. 

  * 

=== 20200122, Wednesday ===

  * arXiv:2001.06904, UV and U-band luminosity functions of galaxies up to z~3 based on a combination of u-band photometry from the CLAUDS survey and other optical+NIR bands from HSC. Nice work!!

  * arXiv:2001.06614, a paper based on xGASS on star formation quenching. Some quenched galaxies as identified to fall below the star-forming main sequence can be as HI-rich as those in the star-forming main sequence. The authors thus suggest that a correct mode of quenching cannot be inferred with star formation rate alone, but must include cold gas as well. **The paper also find the internal structure plays an important role, suggesting the importance of the bulge.**

  * arXiv:2001.07367, kinematics of X-ray galaxy groups in COSMOS is analyzed, and compared to the groups of galaxies in the Horizon-AGN simulation. The main finding is larger peculiar velocities of central galaxies in lower mass groups, which is also seen in the simulation. The effect is probably caused by the accretion of new members, which influences lower-mass systems more strongly.
  
  * arXiv:2001.07182, one more paper on Hubble tension. It is proposed that a dark matter core coexisting with a stellar cusp could bring the lensing measurements of H0 to accord with the CMB/LSS value.

  * arXiv:2001.07041, N-body plus hydro simulations to investigate the effect of gas fraction on bar formation and evolution. Overall, galaxies with higher gas fraction form weaker bars with weaker bar features in all aspects. 

  * arXiv:2001.07633, it is argued that the most plausible candidates for the microlenses are primordial black holes, but not stars as previously claimed. The primordial black holes contributing to the observed microlensing signals are either in the dark matter halos of the lensing galaxies, or more generally distributed along the lines of sight to the quasars.

  * arXiv:2001.07536, Hubble tension can be resolved in models involving an effective energy flux from the matter sector into dark energy resulting naturally from a combination of unimodular gravity and an energy diffusion process.

  * arXiv:2001.07516, the 3rd paper by the H IX galaxy survey team, investigating the gas-phase metallicity of HI extreme galaxies which host at least 2.5 times more HI than expected from their R-band optical photometry. The paper studies the optical integral field spectroscopy of the galaxies, and conclude that HIX galaxies show no conclusive evidence for recent major accretion or merger events. Their overall lower metallicities are likely due to being hosted by high spin halos, which slows down their evolution and thus the enrichment of their interstellar medium.

  * arXiv:2001.07459, a model on the impact of galaxy potential on local star formation. The conclusion appears to support the idea of morphology quenching as regulated by a massive central object like a significant bulge. This paper might be relevant to Jing Tao's current project. Need to look into the paper more carefully.

  * arXiv:2001.07447, a white paper by Ran Wang, Wei-has Wang et al. on the future of the sub-mm studies of galaxies with EAO facilities. 

  * extreme objects:
    * arXiv:2001.07446, an AGN showing extreme variability: becoming brighter by 1 magnitude over less than a year and fading to the pre-burst level over 3 years. Interesting object!
    * arXiv:2001.07347, a BAL with extremely large outflow, with velocities of ~ 38,000 km/s and velocity width of ~10,000 km/s, which is the largest velocity measured to date.
    * HI extreme galaxies as mentioned above, arXiv:2001.07516.

=== 20200120, Monday ===

  * papers on AGN/stellar feedback:
    * arXiv:2001.06011, ALMA and SCUBA-2 observations are obtained for the X-ray sources in the CDF-S field. In total, the full X-ray sample contributes ~10% of the 850 micron extra-galactic background light. Another interesting result from this paper is that some sources with intermediate X-ray luminosity present extreme high star formation rate (SFR>300 solar mass per year), but such extreme star formation is not seen in any high X-ray luminosity sources. This is taken as **evidence for star formation quenching in the most luminous AGN**, as a consequence of the clearing of gas in these sources. 
    * arXiv:2001.06012, a model on "positive feedback" is presented. Supernova feedback drives gas out into the hot halo. The gas that is sent out is cooler than the gas in the halo, thus when it mixes it helps the halo gas cools, providing fuel for star formation as the mixed gas falls back onto the Galactic disc. The authors find that this process can main **a roughly-constant cold gas mass in the Milky Way over at least 3 Gyr**. In addition, **a characteristic star formation of 0.5 solar mass per year is found**, above/below which the feedback becomes negative/positive, i.e. either suppressing or enhancing the gas cooling and star formation.

  * AGN in the CDF-S field, two papers by the same group of authors
    * joint analysis of the Chandra and ALMA/SCUBA-2 data (arXiv:2001.06011, see above);
    * arXiv:2001.06015, search for high-z (z>4.5) X-ray AGNs in the CDF-S field, using Chandra 7Ms deep imaging, as well as HST (1.6micron), Spitzer (4.5micron) and ALMA (850 micron) observations. Only five possibly z>5 X-ray AGN are found, and all of them may also lie at lower redshifts. **This implies rapid drop of X-ray AGN number density at high redshifts, and a very low black hole accretion density (very little growth in BH mass density) over z=5-10.**

  * arXiv:2001.06017, a paper by Francesco Shankar and collaborators on galaxy pair fractions in STEEL (the Statistical sEmi-Empirical modeL). The authors examine the effect of variation in the stellar-to-halo mass relation possibly caused by uncertainties in stellar mass estimation, and find **a reduction of the pair fraction with steepening the stellar-to-halo mass ration**. This echoes a recent simulation-based paper (arXiv:2001.02461, see the notes towards the end of this wiki page) which examines the robustness of galaxy pair definition in terms of pair separation.

  * arXiv:2001.06018, Clustering of DESI-like LRGs using photo-z sample, consisting of 2.7 million objects at 0.4<z<0.9 over 5655 sq deg. Photo-z's are estimated from the Legacy survey DECam and WISE photometry, with a precision of sigma=0.02 for LRGs. HOD models are used to fit the clustering measurements, and the MultiDark halo catalog is used. The main scientific result is the **little evolution of the LSS bias factor** over the redshift range probed. Byproduct of the work is **a photo-z catalog for z<21 (z-band magnitude) over >16,000 sq. deg**, which are released to the public.

  * arXiv:2001.06025, SFR-M* relation of galaxies at z=1-4 in the EAGLE simulation is examined. The purpose of the paper is to find the reason(s) for the different SFR-M* relation found by different authors, as well as the different relation between observations and simulations. The main conclusion is that **the severe tension between different observational studies can be broadly explained by the different techniques to infer SFRs.** (I'm wondering whether the same analysis has been done for lower redshifts where galaxy samples are larger and data are better.)

  * arXiv:2001.06379, VESTIGE (Virgo Environmental Survey Tracing Ionized Gas Emission), a survey of narrow-band imaging of the Halpha+[NII] emission for the Virgo cluster using CFHT/MegaCam. 11302 HII regions are identified over 114 late-type galaxies. The main conclusion is that **the star formation quenching in cluster galaxies is driven by ram pressure**, but not other mechanisms such as strangulation which is unable to reproduce the observed radially truncated profiles. 

=== 20200117, Friday ===

  * arXiv:2001.05512, diffuse dust distribution in the ICM of Virgo Cluster. Very interesting and important topic! The paper reports on the detection of the diffuse dust out to ~0.4 viral radius. The measurement is obtained by finding color reddening in NUV-i in the background ~12000 galaxies (0.02<z<0.8). On average the reddening E(B-V) ~ 0.042 mag, and an average extinction of A_V = 0.14 for a total dust mass of 2.5x10^9 solar mass, assuming a LMC extinction law. The dust-to-gas mass ratio is 0.0003, accordingly. 

  * arXiv:2001.05604, ALMA observation of a DLA at z=3.15 identified from the spectrum of a background quasar at z=3.295. The DLA system has optical counterpart showing Lyalpha emission line which is double-peaked (likely a rotating disc system?). The purpose of the ALMA observation is to detect [C II] line in this system, but nothing is observed. Two neighboring sub-mm sources are observed, serendipitously, but their redshifts and origin are unclear. (Looks like an unsuccessful ALMA proposal)

  * arXiv: 2001.05770, neutral atomic carbon [CI] is shown to be a good proxy of molecular hydrogen for high-z galaxies, in remarkable agreement with the gas mass infrared from CO. I think this is good news for studies of high-z galaxies; for a long time the observation of molecular gas of high-z galaxies has been rather limited, due to the lack of CO observations.

  * arXiv:2001.05506, MaNGA-based study of early-type galaxies, comparing the stellar age and metallicity gradients for three types of galaxies: classical ellipticals, recently quenched, and blue star-forming galaxies. 

  * arXiv:2001.05508, disc galaxy simulation for understanding of the escape of Lyman continuum photons. Observations of LGBs at z=3-4 reveal low escape fractions. The simulation in this paper suggests that high metallicity is likely the reason for the low escape fractions; in this case the escape fraction decreases with increasing metallicity and also with increasing dark halo mass. Gas mass is not important.

  * arXiv:2001.05639, the IllustrisTNG300 simulation used to examine the correlation of the baryonic content of dark halos with their formation time, as quantified by the magnitude gap between the brightest and the fourth brightest galaxy member. The magnitude gap is strongly correlated with gas mass, BCG stellar mass and the (total?) stellar mass of satellites, but not with the total stellar mass of halo.

  * arXiv:2001.05776, CO(4->3) mapping of a BCG at z=1.7 reveals ram-pressure stripping effect which stripes off the dense molecular gas of central galaxies in density clusters. 

  * arXiv:2001.05738, spatially resolved stellar age map of galaxy bulges using data from CALIFA.

  * arXiv:2001.05679, a joint analysis of IFU and CO maps for a single galaxy, using data from CAHA (the same instrument used by CALIFA) and NOEMA respectively, by the galaxy group at NJU.

  * arXiv:2001.05507, SCUBA-2 survey of 850um imaging around 19 red QSOs at z~2. 

  * arXiv:2001.05499, NuStar monitoring campaign of NGC1068, a Compton-thick Seyfert 2 which has been monitored by many telescopes for a long time. 

  * two new papers on Hubble constant:
    * arXiv:2001.05874, one more paper on H0 tension. The so-called non-standard quasi-molecular mechanism of recombination is suggested to be able to resolve the Hubble tension problem.
    * arXiv:2001.05881, examination of errors arising from the measurements. It is found that in order to not bias the final results many aspects should be explicitly taken into account (of course!!).

  * two paper on galaxy intrinsic alignment:
    * arXiv:2001.05930, primordial gravitational waves and non-Gaussianities, both produced during inflation, may leave a distinctive imprint in galaxy intrinsic alignment, detectable in the galaxy shape power spectrum (alignment correlation function as well?). The paper discusses the possibility of observing such imprints in future large surveys (should be helpful for science cases of the 6.5m telescope).  
    * arXiv:2001.05962, another paper of today on galaxy intrinsic alignment, by Teppei (nice!). The paper shows the intrinsic alignment of galaxies measured in redshift surveys offers a precision route to constrain cosmology. 

=== 20200116, Thursday ===

  * arXiv:2001.04984, small bulges follow the same relation of mass versus velocity dispersion as massive bulges and globular clusters. This is interpreted as supporting evidence for small bulges to be formed at early universe, but not products of secular evolution driven by bars or minor mergers. This is contrast to what I have understood from SDSS and MaNGA studies. Needs more careful reading and thinking... 

  * arXiv:2001.04985, on AGN feedback, the authors "encourage to adopt and unify three physically-motivated scales for feeding and feedback (micro - meso - macro ~ mpc - kpc - Mpc), linking them in a tight multiphase self-regulated loop."

  * arXiv:2001.04989, luminosity functions of galaxies at z=0.47 and z=1.59, constrained by LARGER data.

  * arXiv:2001.04992, theoretical study of the IRX-beta relation of star-forming galaxies in Illustris TNG50 simulation. Should be helpful for understanding the dust content of real galaxies.

  * arXiv:2001.05002, LBT/MODS spectra for 52 HII regions in 4 galaxies, obtained by the CHAOS project. Sounds like interesting data for better understanding of the (spatially resolved) chemical abundance of gas in galaxies. May be compared with MaNGA and other IFU studies.

  * arXiv:2001.05003, a new paper by Sara Ellison on a joint analysis of the MaNGA and ALFA data for the galaxies in the ALMaQUEST survey. One of their key result is that the starburst in central region of their galaxies is driven by enhancement in star formation efficiency. This seems to be contrast to our result published in Ryan's paper, where we didn't see any significant deviations of our galaxies from the Kenniccutt star formation law. Need to read the paper more carefully. It's good that she cited both my 2008 paper and Ryan's paper.

  * arXiv:2001.05047, [CI] line intensity map of 18 nearby galaxies obtained with SPIRE FTS on Herschel. A tight relation between CO(4-3) and [CI](2-1) line intensities.

  * arXiv:2001.05302, a new paper by Teppei on potential containing capability of alignment of galaxies on cosmology. His model still works well.

  * arXiv:2001.05473, detection of extended Lyalpha emission around 80 quasars at z~3 based on MUSE data. The CGM within the central 30-50kpc is metal rich, ~0.5 solar or even higher, but there is a more extended component of the CGM that is much more metal-poor, indicating accretion of near-pristine gas from the IGM.

  * arXiv:2001.05487, a new survey of mid-infrared imaging on Galactic center, using the FORCAST instrument on SOFIA. This is the overview paper of the project.

=== 20200115, Wednesday ===

  * arXiv:2001.04471, AGN variation is not a stationary process, but depends on AGN luminosity and redshift. The result is obtained by comparing the SDSS and HSC data of an AGN sample, which are separated in ~15 years in time. Interesting and surprising result!

  * arXiv:2001.04472, a statistical study of galaxy mergers in IllustrisTNG simulation. Another paper written by the Canadian group who once again intentionally ignored my original contribution to their research topic! Perhaps I should not care about those people any more!

  * three papers on low-z galaxy clusters:
    * arXiv:2001.04478, dust-to-stellar mass ratio of cluster member galaxies in Abell 1758. Key result is that the ratio is smaller in star-forming galaxies in this dense region, when compared to those in the field. This is interpreted as destruction of dust by ICM heating, ram-pressure stripping or metering shocks. Relevant to what Li Niu has been doing, probably.
    * arXiv:2001.04707, Abell 1703 is not a relaxed cluster as previously thought, but has at least two or three sub-clumps.
    * arXiv:2001.04725, discovery of radio halos in Abell S1063 and Abell 370

  * arXiv:2001.04479, spatially resolved star-forming main sequence (M*-SFR relation) using the DustPedia database: high-res imaging in 23 bands for a sample of nearby galaxies. This data has been used to study spatially resolved dust-to-gas and dust-to-metal ratios. Key result of the new paper is that the same M*-SFR density relation as found in previous IFU-based studies (MaNGA must be one of those) is observed. Since the spatial resolution is different in different studies, this result implies the universality of the relation over different scales. 

  * arXiv:2001.04473, high-z cosmology study with Oxygen lines in Halpha survey. I'm not quite sure the next generation emission line galaxy surveys will target Halpha, which is good but due to its long wavelength it will not be covered in the optical/infrared spectroscopy. Rather, I believe future cosmology surveys will rely mostly on [O II] doublet, but not Halpha. Maybe the authors are considering low-z surveys.

  * arXiv:2001.04638, non-coronating gas component in a high-z starburst galaxy at z=4.3, in the COSMOS field. ALMA observations reveals high-resolution image of [C II] emission. The gas component is found to be falling into the galaxy from a direction perpendicular to the disk rotation. This is interesting, but the interpretation is different from the galaxy-galaxy merger origin of the counter rotators in MaNGA as suggested by Chen Yanmei and collaborators. This might also be somehow related to the Halpha blobs found by Ji Xihan.

  * arXiv:2001.04975, CO measurements in various J transitions for the central region of 126 nearby galaxies. CO-H2 conversion factor is ~10 times lower in galaxy centers than the commonly adopted value!

  * arXiv:2001.04653, study of a single star in MW (ν Indi) provides evidence to support the collision of the dwarf galaxy, Gaia-Enceladus, with MW at its earliest time (about 11-13 Gyr ago). 


=== 20200114, Tuesday ===

Tuesdays always have the longest list of papers!

  * three papers on H0 tension (hot topic!):
    * arXiv:2001.03624, review article by Adam Riess on the H0 tension. Important topic and timely summary for the current community.
    * arXiv:2001.03775, the papers claims the Hubble tension problem is solved naturally in constant coupling model, but the problem remains unsolved in varying coupling model. Coupling means the interacting scenario between dark matter and dark energy. The parameter, delta, is defined to quantify the strength and direction of the energy transfer between the two dark sectors (positive for transfer from dark matter to dark energy, and vice versa).
    * arXiv:2001.04307, recently introduced "measurable dark energy models" is investigated. The key point is that this model can be excellent candidate to alleviate the H0 tension.

  * two papers on strongly lensed high-z galaxies:
    * arXiv:2001.03619, Pop III star detected at z=6.629 with MUSE, strongly lensed
    * arXiv:2001.03641, a hyper luminous starburst galaxy at z=4.72, lensed by a pair of galaxies at z=1.48. L_IR~0.6x10^14 solar. Very short depletion time, 14+/-5 Myr, indicating either very high star formation efficiency, or fast decrease of star formation.

  * Observations of high-z galaxies
    * arXiv:2001.03699, Lyman-alpha blob at z=3.1 with deep MUSE observations, a total of 17.5 hrs narrow-band imaging in Ly-alpha 1216, HeII 1640 and CIV 1549.A coherent large-scale velocity gradient of ~1000 km/s is found, and it is aligned perpendicular to the major axis of the blob.
    * arXiv:2001.04453: faint Lyman alpha emitters near z>4.7 CIV absorbers by MUSE
    * arXiv:2001.04303, FIR SED of galaxies at z~6 can be reproduced by an analytic dust emission model of Pop II massive galaxies. 

  * theoretical papers on galaxies:
    * arXiv:2001.04354, release of the AGORA simulations of galaxies.
    * arXiv:2001.04384, hydrodynamical modeling of starburst-driven outflows; a variety of physical mechanisms are considered.

  * arXiv:2001.03795, splash bridges of gas between interacting gas-rich galaxies. This is a theoretical study applying a "sticky particle simulation code" developed earlier by the same authors. Stripped gas is drawing more attention. Still remember the observational paper of yesterday (arXiv:2001.03385). The Taffy Galaxies with ALMFA by Appleton et al. (2019) is mentioned in the current paper; sounds like an interacting case study.

  * arXiv:2001.04037, a new paper by Barbara and Luca, interesting work! They continuously use the xGASS data (of course) and examine the asymmetric HI spectrum of their galaxies. Two interesting points: 1) S/N is important when identifying asymmetry in HI spectra; some of the effect is caused by noise; 2) environment processes should be the reason for the asymmetry. Thus this is another work providing clues on stripped gas from galaxies.

  * arXiv:2001.03620, GW detections for accreting BH-BH binaries, predicted for the planned LISA. Sky positions can be identified within 0.4 deg^2 uncertainty for stellar-origin BH-BH binaries with accretion at the Eddington or super-Eddington rates, and <0.01 deg^2 for intermediate BH-BH binaries with >~10% of the Eddington rate. It's hard to believe such small position uncertainties. 

  * arXiv:2001.03995, cold spot in CMP maps is a significant anomaly. The authors consider two possible origins of the cold spot: a huge void or a cosmic texture, and found neither can explain the cold spot anomaly. I note that, in Yangyao's paper we indeed found our local universe is located in a void. 

  * arXiv:2001.04046, looks like an important improvement for near-infrared spectrograph, in terms of efficiently suppressing the emission of OH molecules from the atmosphere. 18% overall throughput is impressive and encouraging.

  * arXiv:2001.04090, formation history of subhalos and evolution of satellites by Shi Jingjing (and Huiyuan and Houjun). I should read the paper.

  * arXiv:2001.03621, photo-z estimation for LSST

  * arXiv:2001.04172, Avi Loeb again, TDE of a star by a supermassive BH.


=== 20200113, Monday ===

  * arXiv:2001.03176, as it is said in the abstract of this paper, it is very useful to have cosmological simulations for different cosmological models for preparing/understanding future large surveys. However, it is impossible to run N-body simulations for every possible cosmological model. One solution is to use some technique/algorithm to rescale the simulation of given cosmology, obtaining generations of simulations for different cosmologies. Apparently Raul Augulo has been pushing this effort for a long time. I remembered he developed a cosmology-rescaling algorithm with Simon White when he was a student at MPA. This new paper looks like a new milestone along the line of this effort. This echoes the recent talk by Yin Li here who applied matching-learning for the same purpose. Future surveys such as DESI and PFS cosmology surveys will also need mock catalogs, supposed to be obtained for different cosmologies by running a large set of N-body simulations. The rescaling algorithm and the machine-learning technique should definitely be considered.

  * arXiv: 2001.03178, another paper based on the FIRE simulation, on the formation history of the MW-M31 system. It looks a reasonable result that the main progenitor of the systems formed at ~12 Gyr ago, which is consistent with the known age of the MW. However, according to recent studies of the APOGEE data, the MW experienced two merger events at later times. This seems to not be mentioned in the current paper, although the role of (lots of) minor mergers is emphasized. Need to look into the paper for details.

  * arXiv:2001.03181, a review paper on dust attenuation law in galaxies to appear in ARA&A. Very timely for us! Should be helpful to Li Niu, Zhang Xiaoya and also myself for better interpreting our MaNGA-based dust attention measurements.

  * arXiv:2001.03209, proceedings of a conference, but technique of "pattern recognition" mentioned in the tile sounds interesting, probably it will be helpful to Wang Kai and Chen Yangyao who're developing algorithms for identifying high-z (proto-)clusters and groups of galaxies.

  * arXiv:2001.03379, interesting work to test (against) the merger-driven QSO formation picture. 

  * arXiv:2001.03385, interesting effort of searching for stripped HI streams from galaxies in dense regions. Good to know that this is doable with Arecibo, so the FAST should also be able to do something. Should be kept in mind for possible project for FAST when it is ready.

  * arXiv:2001.03450, analysis of MUSE IFU data for 45 nearby galaxies, comparing the HII regions on and off spiral arms. Results are reasonable --- HII regions in spiral arms are more metal rich. This is something that could be done as well with the MaNGA data, with larger sample size but relatively poor spatial resolution. It would be interesting to see whether the small percentage of the MUSE sample which shows the opposite trend is really a significant population in the MaNGA.

  * arXiv:2001.03470, LAMOST stellar parameters, perhaps a useful plus to MaStar?

  * arXiv:2001.03498, C IV absorbers at z>5, cool! Should talk to Cai Zheng who is on the paper.

  * Others: 
    * a series of theoretical papers by a same group on tidal disruption events (arXiv:2001.03501-03504, and arXiv:2001.03234)
    * modified gravity versus modified inertia, test with observed rotation curves (arXiv:2001.03348)
    * release of 637 spectra for 247 SN Ia. (arXiv:2001.03235)


=== 20200110, Friday ===

  * Li Niu's paper on dust attenuation curve measuring is out today (arXiv:2001.02815)

  * arXiv:2001.02695, LEGA-C survey team paper on stellar kinematics of massive galaxies at z~0.8, 
    * fraction of slow rotators increases with stellar mass and environmental density

  * arXiv:2001.02696, Quasar luminosity function from z=0-7, sounds like a nice summary of the existing data. LFs are in Fig.5. Interesting to see Phil Hopkins to write observational papers

  * two papers from the same group, based on ultra deep imaging data,
    * arXiv:2001.02689, proposing a new physically motivated definition of galaxy size. Galaxy size is given by the radius where stellar surface mass density is equal to 1 solar mass per pc^2, similar to the way of the radio community defining R_H1; A very tight mass-size relation is found using the newly defined size, with a scatter of only ~0.06dex!
    * arXiv:2001.02691, UDGs have sizes comparable to the sizes of dwarf galaxies if the new size definition is adopted! this means they are not diffuse at all. Interesting! I expect to see many more papers debating on this result in the near future. 

  * two papers related to Wolf-Rayet stars/galaxies:
    * arXiv:2001.02693, stellar population models applied to understand the observed photon ionization efficiency. The papers uses both Starburst99 and BPASS, both of which include massive stars (incl. WR stars). I would strongly suggest Liang Fuheng to have a look at the BPASS code papers, and consider the possibility of applying that code for his current project on WR regions in MaNGA.
    * arXiv:2001.02725, outbursts from a Wolf-Rayet star in M33; nice to directly see an individual WR stars in a nearby galaxy.

=== 20200109, Thursday ===

Many interesting papers (particularly on galaxies) from arXiv yesterday! Apparently western astronomers are fully back at work.

Here is a list of impressive topics from my reading: 
  * two papers on stellar-to-dark matter mass relation, 
    * one observational paper for z=0-4 using COSMOS data (arXiv:2001.02230),
    * and one theoretical paper for z=5-10 (arXiv:2001.02233)
 
  * three papers on AGN or SN feedback! 
    * Spatially resolved spectroscopy with VLT/KMOS find no evidence for AGN feedback even at high redshifts! surprising and unexpected result! (arXiv:2001.02242)
    * The UVIT paper continue to claim evidence for AGN feedback, though. 
    * case study of Mrk900, a blue compact dwarf galaxy, using VMOS at VLT (arXiv:2001.02573)

  * MW dark halo masss is updated, 1.5x10^12 solar mass, consistently falling in the previously found range of 1-2 x10^12 solar mass. Gaia data is used. (arXiv:2001.02651)

  * two papers using simulations: 
    * one on stelalr kinematics in simulated galaxies (might be helpful to interpret IFU-based observations), arXiv:2001.02237
    * one on galaxy mergers (it's good to know that the simple selection by pair separation still is substantially accurate, even better than more complex selection criteria), arXiv:2001.02461

  * supernova host galaxies in DES survey, possible effect of cosmological constant on galaxy clusters, globular clusters in dwarf galaxies, difficulties of selecting AGN in MIR

  * Papers on special types of galaxies:  
      * ETGs with UV upturn from GAMA survey (arXiv:2001.02465)
      * BCDG Mrk 900 (arXiv:2001.02573, mentioned above already)
      * LSBGs: review on low-surface-brightness galaxies by Sugata Kaviraj, (arXiv:2001.01728)
      * peculiar spiral galaxy NGC5474, resolved photometry from HST. This is a satellite galaxy of M101, with off-center bulge, (arXiv:2001.02413)


  * and fianlly, transfer of life by Earth-grazing objects! Another brain-storm paper by Avi Loeb ? The good thing is that it is only 4 pages. (arXiv:2001.02235)
Dr. Cheng Li

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