My arXiv notes (since 2020)
Review articles
2023
2022
July
June
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We show that these objects are strongly triaxial, with triaxiality parameters 0.39 ≤T≤ 0.72, have on average axis ratios <p®>= 0.84 and <q®>= 0.68, and are more spherical in the central regions but flatten out at large radii.
Measured shapes in the outskirts agree well with the shapes found for simulated massive galaxies and their dark matter halos from both the IllustrisTNG and the Magneticum simulations, possibly probing the nature of dark matter. In contrast, both simulations fail to reproduce the observed inner regions of BCGs, producing too flattened objects.
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May
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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
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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.
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January
2021
November
October
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arXiv:2110.04537 The evolution of the barred galaxy population in the TNG50 simulation
arXiv:2110.04434The 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.
arXiv:2110.04342 From Blue Cloud to Red Sequence: Evidence of Morphological Transition Prior to Star Formation Quenching
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.
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.
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.
arXiv:2110.03856 Using the EAGLE simulations to elucidate the origin of disc surface brightness profile breaks as a function of mass and environment
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.
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
High-z galaxies:
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.
arXiv:2007.08384 The ALPINE-ALMA [CII] Survey: Obscured Star Formation Rate Density and Main Sequence of star-forming galaxies at z>4
arXiv:2007.07913 The role of mergers and fly-bys in driving the evolution of dwarf galaxies over cosmic time
arXiv:2007.07413 A 16 deg^2 survey of emission-line galaxies at z<1.6 from HSC-SSP PDR2 and CHORUS
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)
arXiv:2007.05581 Dual supermassive black holes at close separation revealed by the Hyper Suprime-Cam Subaru Strategic Program
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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
arXiv:2007.04988 Predictions for galaxy populations at z>10 to be observed with JWST. Mock catalogs from the study are publicly available.
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.
arXiv:2007.04996 GASP XXX. The spatially resolved SFR-Mass relation in stripping galaxies in the local universe
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…
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arXiv:2007.05484 SPIDERS: overview of the X-ray galaxy cluster follow-up and the final spectroscopic data release
May
arXiv:2005.08995: Observing Correlations Between Dark Matter Accretion and Galaxy Growth: I. Recent Star Formation Activity in Isolated Milky Way-Mass Galaxies
arXiv:2005.05991: The globular cluster system mass-halo mass relation in the E-MOSAICS simulations.
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.
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.
arXiv:2005.04894: Redshift Evolution of Green Valley Galaxies in Different Environments from the Hyper Suprime-Cam Survey
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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.
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:2001.09999, 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.
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:2001.09154, 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.
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:2001.09058, 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:2001.08760, 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:2001.06614, 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:2001.07041, 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:2001.07516, 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.
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
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 2.5×10^9 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:2001.05679, 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.
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:2001.05002, 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:2001.05473, 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.
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:2001.04479, 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:2001.04653, 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!
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.
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:2001.03385, 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.
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
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:
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