Astro-ph Club

Time : Every Wednesday 10:30 AM
Location: The 2nd floor lounge in Leewonchul Hall
Organizer : Yun-Kyeong Sheen
Previous boards: [astro-ph 2016]
Please add a new article at the first row of the table.


2017

Date Title First author Speaker Keywords arXiv link
2017/11/15 The mass-metallicity relations for gas and stars in star-forming galaxies: strong outflow vs variable IMF Jianhui Lian 신윤경 the origin of the large difference in gas and stellar metallicity arXiv:1710.11135
2017/11/8 Data analysis recipes: Using Markov Chain Monte Carlo David W. Hogg 박대성 very useful and kind, practical guide for using MCMC methods by David Hogg arXiv:1710.06068
Snapshots of structure formation of a 'Cosmic Beast': Full-scale observations and simulations of MACS J0717.5+3745 M. Jauzac 신윤경 A massive galaxy cluster (z = 0.54) surrounded by 11 merging substructures. arXiv:1711.01324
2017/10/25 Hubble Space Telescope Imaging of the Active Dwarf Galaxy RGG 118 Vivienne F. Baldassare 박대성 The nearby dwarf galaxy (RGG 118) hosting an active black hole of $\sim 5 \times 10^{4} M_{\odot}$ is imaged with HST/WFC3 to characterize its host galaxy, which is consequently found to have a pseudobulge using GALFIT modeling. They have shown that its black hole is under-massive with respect to the BH-galaxy scaling relations defined by classical bulge samples, supporting the scenario that BHs in pseudobulge systems grow primarily via secular processes. arXiv:1709.07884
The infrared-radio correlation of spheroid- and disc-dominated star-forming galaxies to z ~ 1.5 in the COSMOS field Dániel Cs. Molnár 신윤경 Low-redshift calibrations of radio emission as an SFR-tracer may remain valid out to at least z ~ 1 - 1.5 for pure star-forming systems. arXiv:1710.07655
2017/9/20 LoCuSS: The infall of X-ray groups onto massive clusters C. P. Haines 신윤경 Identify 39 X-ray groups in the infall regions of 23 massive galaxy clusters at z ~ 0.2 arXiv:1709.04945
The effect of nuclear gas distribution on the mass determination of SMBHs J. E. Mejia-Restrepo 변우원 Line-of-sight inclination of disky nuclear gas distribution may affect to measure the SMBH mass. arXiv:1709.05345
Polarization of the changing-look quasar J1011+5442 D. Hutsemékers 박대성 The polarization observation for a recently discovered changing-look (broad-line disappeared over a timescale of a few years) quasar (J1011+5442) produces the linear polarization degree of $p=0.15\pm0.22\%$, which is equivalent to null polarization. This result supports the scenario that the spectral change is due to a variation of accretion rate and is against the variable dust obscuration scenario. arXiv:1707.05540
2017/7/31-9/8 Summer Break
2017/7/26 Witnessing galaxy assembly in an extended z ~ 3 structure Michele Fumagalli 신윤경 MUSE observations of a high column-density damped Lya absorber (DLA) at z = 3.25 arXiv:1707.07003
2017/7/19 CALIFA reveals prolate rotation in massive early-type galaxies: A polar galaxy merger origin? A. Tsatsi 신윤경 Prolate rotation of early-type galaxies arXiv:1707.05130
First results from the IllustrisTNG simulations: the galaxy color bimodality Nelson+ 김민진 Color bimodality can be well reproduced by the next generation Illustris simulation. arXiv:1707.03395
Black Holes on FIRE: Stellar Feedback Limits Early Feeding of Galactic Nuclei Anglés-Alcázar 김민진 FIRE simulation shows BH growth in early Universe seems to be heavily suppressed by the stellar feedback. arXiv:1707.03832
2017/1/4 SDSS-IV MaNGA: a serendipitous observation of a potential gas accretion event Edmond Cheung 변우원 a large, asymmetric Ha complex that extends ~6.3kpc is most consistent with gas accretion through recycled wind material. arXiv:1609.02155v2
SDSS-IV MaNGA: the global and local stellar mass assembly histories of galaxies Héctor J. Ibarra-Medel 신윤경 the main driver of the global MGHs (mass growth histories) is mass, with more massive galaxies assembling earlier (downsizing) MNRAS.463.2799
2017/1/11 SDSS-IV MaNGA: properties of galaxies with kinematically decoupled stellar and gaseous components Yifei Jin 신윤경 66 galaxies with kinematically misaligned gas and stars MNRAS.463.913
2017/1/18 Evidence for HI replenishment in massive galaxies through gas accretion from the cosmic web Dane Kleiner 신윤경 massive galaxies accreting cold gas from the intrafilament medium that can replenish some HI gas arXiv:1701.03467
Evidences against cuspy dark matter halos in large galaxies Davi C. Rodrigues, Paulo L. C. de Oliveira, Valerio Marra, Antonino del Popolo 유재원 Galaxy rotation curves fitting to compare the Burkert DM profile and the Navarro-Frenk-While (NFW) profile. Only galaxies with stellar mass over $10^{10}M_{\odot}$ match better with NFW profile. arXiv:1701.02698
2017/2/1 Massive relic galaxies prefer dense environments Luis Peralta de Arriba 박대성 the fraction of present-day massive relic galaxies (i.e., $M_{\star} \gtrsim 10^{10} M_{\odot}$ galaxies with little or no growth from star formation or mergers since $z\sim2$) is higher in cluster environment than massive normal galaxies. they also tend to be closer to centers in galaxy clusters than other massive galaxies. arXiv:1605.06503
A gravitationally-boosted MUSE survey for emission-line galaxies at z > 5 behind the massive cluster RCS 0224 Renske Smit 신윤경 the detailed internal properties of a highly magnified z = 4.88 galaxy seen through the z = 0.77 cluster arXiv:1701.08160
Do galaxy global relationships emerge from local ones? The SDSS IV MaNGA surface mass density-metallicity relation Jorge K. Barrera-Ballesteros 변우원 tight relation, with higher metallicities as the surface density increases. This local relationship can reproduce two properties: mass-metallicity rel' and radial metallicity gradients. MNRAS.463.2513
2017/2/8 Generative Adversarial Network recover features in astrophysical images of galaxies beyond the deconvolution limit Kevin Schawinski 신윤경 A machine learning system can learn to recover information from poor quality data. Applicable to data from SDSS, LSST, Euclid, HST, and JWST. arXiv:1702.00403
Growing supermassive black holes in the late stages of galaxy mergers are heavily obscured C. Ricci 박대성 A study on the relation between AGN obscuration and galaxy mergers. By analysing the broad-band X-ray spectra of a sample of 30 U/LIRGs in different merger stages, they showed that the fraction of CT AGNs ($N_{\rm H}>10^{24}$ cm$^{-2}$) in late merger galaxies is higher ($f_{\rm CT}=65$%) than local hard X-ray selected AGNs (mostly isolated galaxies; $f_{\rm CT}=27$%). All AGNs of the sample in late merger galaxies have $N_{\rm H} \geq 10^{23}$ cm$^{-2}$, which implies that obscuring material covers 95% of the X-ray source (richer in gas and dust). arXiv:1701.04825
2017/2/15 The dependence of the mass-metallicity relation on large scale environment Po-Feng Wu 신윤경 the turnover of the MZ relation depends on the gas-content of galaxies. arXiv:1702.03323
An intermediate-mass black hole in the centre of the globular cluster 47 Tucanae Bülent Kızıltan 박대성 a first definitive measurement of IMBH mass ($M_{\rm BH} = 2,200^{+1,500}_{-800}M_{\odot}$) in the globular cluster, 47 Tucanae ($M_{\rm GC} = 0.7\times10^{6}M_{\odot}$) using “Pulsar acceleration” distribution data with extensive $N$-body simulations. the IMBH has no detectable electromagnetic counter part, thus is gas-starved (not actively accreting BH). arXiv:1702.02149
The link between galaxy and black hole growth in the EAGLE simulation Stuart McAlpine 변우원 concurrent with observational results, caused by selection effect arXiv:1701.01122
2017/3/8 Galaxies grow their bulges and black holes in diverse ways Eric F. Bell 김민진(변우원) merger-only scenario cannot explain the variations between stellar halo mass and bulge mass arXiv:1702.06116
The Dragonfly Nearby Galaxies Surveys. III. The luminosity function of the M101 group Shany Danieli 변우원(김석) M101 group also has 'missing satellite' & 'too big to fail' problems arXiv:1702.04727
Star formation histories in mergers: The spatially resolved properties of the early-stage merger LIRGs IC 1623 and NGC 6090 C. Cortijo-Ferrero 신윤경 lower central nebular metallicity, and flatter profiles, in agreement with the gas inflow scenario arXiv:1702.06544
2017/03/22 OMEGAWINGS: the first complete census of post starburst galaxies in clusters in the local universe A. Paccagnella 신윤경 Post starburst galaxies in clusters at 0.04 < z < 0.07. arXiv:1703.03204
The HI content of isolated ultra-diffuse galaxies:a sign of multiple formation mechanisms? E. Papastergis 변우원 UDGs in the field are gas-poor(quiescent) or gas-rich(star-forming) galaxies arXiv:1703.05610
2017/03/29 The MASSIVE Survey - VII. The relationship of angular momentum, stellar mass and environment of early-type galaxies Melanie Veale 신윤경 a reflection of the joint connection between environment versus M_K, and between M_K versus rotation arXiv:1703.08573
A Universe of ultra-diffuse galaxies: Theoretical predictions from the $\Lambda$CDM simulation Yu Rong 변우원 UDGs in the cluster seem genuine dwarf galaxies, but have high-spins of the host halos and formed at late time. arXiv:1703.06147
2017/4/5 Is ram-pressure stripping an efficient mechanism to remove gas in galaxies? Vincent Quilis 변우원 less massive galaxies : outer region, weak RPS / massive galaxies : inner region, removed gas is subdominant compared with the retained gas arXiv:1703.09446
VEGAS: A VST Early-type GAlaxy Survey II. Photometric study of giant ellipticals and their stellar halos Marilena Spavone 신윤경 Decomposition of light profiles arXiv:1703.10835
2017/4/12 AGN with discordant optical and X-ray classification are not a physical family: Diverse origin in two AGN Ordovás-Pascual 변우원 Two type-2 AGN with low X-ray absorption can be explained by nuclear dust extinction and low $M_{SMBH}/M_{host}$ ratio, respectively. arXiv:1704.01595
Red but not dead: Unveiling the star-forming far-infrared spectral energy distribution of SpARCS brightest cluster galaxy at 0 < z < 1.8 N. R. Bonaventura 신윤경 BCGs retain a pulse of star formation activity while maintaining 'red' optical colors. arXiv:1704.02721
2017/4/19 Near-Infrared MOSFIRE Spectra of Dusty Star-Forming Galaxies at 0.2<z<4 C.M. Casey 박대성 Spectroscopically confirming 450$\mu$m and 850$\mu$m selected dusty star-forming galaxies (DSFGs) with Keck MOSFIRE. 31 sources out of 114 targets were confirmed. This low rate of confirmation is due to intrinsically high rest-frame optical obscuration (too weak Halpha to be detected) and limited sensitivity to certain $z$ ranges (MOSFIRE H and K bands). Large millimeter survey program is necessary to spectroscopically characterizing the high-$z$ DSFGs. arXiv:1703.10168
Molecular gas dominated 50 kpc ram pressure stripped tail of the Coma galaxy D100 Pavel Jachym 신윤경 CO observations with IRAM 30m telescope reveal in total ~ 10$^{9}$ M$_{\odot}$ of H$_{2}$ in several regions along the ram pressure stripped gas tail arXiv:1704.00824
2017/4/26 GAIA reveals a metal-rich in-situ component of the local stellar halo Ana Bonaca 변우원 half of halo sample is metal-rich([Fe/H]>-1) and seems to be formed in-situ rather than accreted. arXiv:1704.05463
Sumo Puff: tidal debris or disturbed ultra-diffuse galaxy? Johnny P. Greco 신윤경 Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) discovered a diffuse stellar cloud with an angular extent > 30“. arXiv:1704.06681
2017/5/10 Evolutionary phase of gas-rich galaxies in a galaxy cluster at z=1.46 Masao Hayashi 신윤경 ALMA CO J=2-1 detection of 17 galaxies arXiv:1705.02567
Tidal tails around the outer halo globular clusters Eridanus and Palomar 15 G. C. Myeong 변우원 Tidal tails of two GCs are likely formed by the dynamical evolution of the cluster itself arXiv:1704.07690
2017/5/17 Obscured Active Galactic Nuclei triggered in compact star-forming galaxies Yu-Yen Chang 박대성 obscured AGN hosts (182 at $z \le 1.5$ in COSMOS field) are more compact than normal star-forming sources at similar redshift and stellar mass. since their sample has low merger fraction and does not show highly perturbed morphology, they suggest that obscured AGNs are primarily hosted by star-forming galaxies having undergone a process of dynamical contraction (central gas compaction triggered by intense gas inflow introducing violent disc instabilities).
high-z discs -(gas contraction)→ blue nuggets -(quenching)→ red nuggets -(size growth by dry mergers)→ low-z spheroids
arXiv:1612.02429
2017/6/7 Supermassive black holes in disk-dominated galaxies outgrow their bulges and co-evolve with their host galaxies B.D. Simmons 변우원 major mergers do not play a significant role in controlling the coevolution of galaxies and BH. arXiv:1705.10793
The Taipan Galaxy Survey: scientific goals and observing strategy Elisabete da Cunha 신윤경 A multi-object spectroscopic survey of the Southern hemisphere for galaxies out to z < 0.4. arXiv:1706.01246
2017/6/14 Fully stripped? they dynamics of dark and luminous matter in the massive cluster collision MACSJ0553.4-3342 Ebeling H. 신윤경 A binary, post-collision merger of massive clusters at z =0.4270. The cool core of the slightly less massive cluster was fully stripped and captured by the massive one during the collision. arXiv:1706.03535
2017/6/21 Ten Billion Years of Brightest Cluster Galaxy Alignments Michael J. West 박대성 the major axis of the BCG and that of the host cluster are aligned in high-redshift universe already (using HST images of distant 65 galaxy clusters at $0.19 < z < 1.8$).
plausible mechanisms for the origin of BCG alignments: 1) anisotropic infall of matter into clusters along preferred directions. 2) primordial alignment. 3) gravitational torques that make it aligned with the local tidal field.
arXiv:1706.03798
Blueberry galaxies: the lowest mass young starbursts Huan Yang 신윤경 Dwarf starburst galaxies with very small size, very strong emission lines, the lowest stellar mass and lowest metallicities. arXiv:1706.02819
Quantifying the Origin and Distribution of Intracluster Light in a Fornax-like Cluster Kathryn A. Harris 유재원 In N-body simulation, the infalling subhalos (disc + halo) are tidally stripped or disrupted and form disc ICL and halo ICL. The disc ICL is more concentrated in center of the galaxy cluster and the halo ICL (old stars) dominates at radial distance larger than 200kpc. arXiv:1706.03713
Properties of Merger Shocks in Merging Calaxy Clusters Ji-Hoon Ha 김효원 Numerical simulation about galaxy cluster major merger generate shock wave. Studying about merger shock process and properties of shock wave. arXiv:1706.05509
2017/6/28 A massive, dead disk galaxy in the early Universe Sune Toft 신윤경 We report an analysis of the stellar populations and kinematics of a lensed z=2.1478 compact galaxy, which-surprisingly-turns out to be a fast-spinning, rotationally supported disk galaxy. arXiv:1706.07030
The sustainable growth of the first black holes E. Pezzulli 변우원 Loss of angular momentum of accreted gas is the most important factor to grow SMBH, while the effect of stellar feedback and disk wind is not. arXiv:1706.06592
2017/7/5 The most-luminous heavily-obscured quasars have a high merger fraction: morphological study of WISE-selected hot dust-obscured galaxies Lulu Fan 박대성 Using high-resolution HST WFC3 NIR images, they show that Hot DOGs at $z\sim3$ have a high merger fraction ($62\pm14\%$) and transforming (intermediate) morphologies ($\langle n_{\rm sersic}\rangle=2.1$), which are consistent with what has been expected from the merger-driven evolutionary model. arXiv:1605.00661
Black hole masses of tidal disruption event host galaxies T. Wevers 변우원 The TDE host galaxy sample is dominated by low mass black holes($\sim10^6M_{\odot}$) as expected. arXiv:1706.08965
2017/7/12 Star formation in low density HI gas around the elliptical galaxy NGC 2865 F. Urrutia-Viscarra 신윤경 Potential precursors of globular clusters. arXiv:1706.06585
Discovery of a lensed ultrabright submillimeter galaxy at z=2.0439 A. Díaz-Sánchez 박대성 By cross-correlating $ALLWISE$ and $Planck$ catalogs, they found a lensed (lensing amplification factor of 11) ultrabright ($L_{\rm IR} \sim 10^{13}L_{\odot}$; SFR $\sim 500-2000$ $M_{\odot}$/yr) SMG (named to Cosmic Eyebrow) at $z=2.044$. The follow-up optical (rest-frame UV) and archival NIR (rest-frame opt) spectroscopic data revealed that they are consistent with a typical absorption line spectrum of a starburst galaxy and typical H$\alpha$ features of other well known SMGs. arXiv:1707.02454