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Your search keyword '"Dekel, A [0000-0003-4174-0374]"' showing total 6 results
Start Over Author "Dekel, A [0000-0003-4174-0374]" Topic astrophysics of galaxies (astro-ph.ga)
6 results on '"Dekel, A [0000-0003-4174-0374]"'

1. RC100: Rotation Curves of 100 Massive Star-forming Galaxies at z = 0.6-2.5 Reveal Little Dark Matter on Galactic Scales

Author

A. Nestor Shachar, S. H. Price, N. M. Förster Schreiber, R. Genzel, T. T. Shimizu, L. J. Tacconi, H. Übler, A. Burkert, R. I. Davies, A. Dekel, R. Herrera-Camus, L. L. Lee, D. Liu, D. Lutz, T. Naab, R. Neri, A. Renzini, R. Saglia, K. F. Schuster, A. Sternberg, E. Wisnioski, S. Wuyts, Nestor Shachar, A [0000-0003-1785-1357], Price, SH [0000-0002-0108-4176], Förster Schreiber, NM [0000-0003-4264-3381], Genzel, R [0000-0002-2767-9653], Shimizu, TT [0000-0002-2125-4670], Tacconi, LJ [0000-0002-1485-9401], Übler, H [0000-0003-4891-0794], Burkert, A [0000-0001-6879-9822], Davies, RI [0000-0003-4949-7217], Dekel, A [0000-0003-4174-0374], Herrera-Camus, R [0000-0002-2775-0595], Lee, LL [0000-0001-7457-4371], Liu, D [0000-0001-9773-7479], Lutz, D [0000-0003-0291-9582], Naab, T [0000-0002-7314-2558], Neri, R [0000-0002-7176-4046], Renzini, A [0000-0002-7093-7355], Saglia, R [0000-0003-0378-7032], Schuster, KF [0000-0003-2890-9454], Sternberg, A [0000-0001-5065-9530], Wisnioski, E [0000-0003-1657-7878], Wuyts, S [0000-0003-3735-1931], and Apollo - University of Cambridge Repository

Subjects
Space and Planetary Science, 5101 Astronomical Sciences, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astronomy and Astrophysics, 5109 Space Sciences, Astrophysics - Astrophysics of Galaxies, 51 Physical Sciences
Abstract

We analyze Ha or CO rotation curves (RCs) extending out to several galaxy effective radii for 100 massive, large, star-forming disk galaxies (SFGs) across the peak of cosmic galaxy star formation (z~0.6-2.5), more than doubling the previous sample presented by Genzel et al. (2020) and Price et al. (2021). The observations were taken with SINFONI and KMOS integral-field spectrographs at ESO-VLT, LUCI at LBT, NOEMA at IRAM, and ALMA. We fit the major axis kinematics with beam-convolved, forward models of turbulent rotating disks with bulges embedded in dark matter (DM) halos, including the effects of pressure support. The fraction of dark to total matter within the disk effective radius ($R_e ~ 5 kpc$), $f_DM (R_e)=V_{DM}^2 (R_e)/V_{circ}^2 (R_e)$, decreases with redshift: At z~1 (z~2) the median DM fraction is $0.38\pm 0.23$ ($0.27\pm 0.18$), and a third (half) of all galaxies are "maximal" disks with $f_{DM} (R_e)2.5 M_{\odot} yr^{-1} kpc^{-2}$) and galaxies with massive bulges ($M_{bulge}>10^{10} M_{\odot}$). A combination of stellar or active galactic nucleus (AGN) feedback, and/or heating due to dynamical friction, either from satellite accretion or clump migration, may drive the DM from cuspy into cored mass distributions. The observations plausibly indicate an efficient build-up of massive bulges and central black holes at z~2 SFGs., Submitted to ApJ (34 pages, 12 figures, 4 tables)

Published
2023
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2. CEERS Key Paper V: A triality on the nature of HST-dark galaxies

Author

Pablo G. Pérez-González, Guillermo Barro, Marianna Annunziatella, Luca Costantin, Ángela García-Argumánez, Elizabeth J. McGrath, Rosa M. Mérida, Jorge A. Zavala, Pablo Arrabal Haro, Micaela B. Bagley, Bren E. Backhaus, Peter Behroozi, Eric F. Bell, Laura Bisigello, Véronique Buat, Antonello Calabrò, Caitlin M. Casey, Nikko J. Cleri, Rosemary T. Coogan, M. C. Cooper, Asantha R. Cooray, Avishai Dekel, Mark Dickinson, David Elbaz, Henry C. Ferguson, Steven L. Finkelstein, Adriano Fontana, Maximilien Franco, Jonathan P. Gardner, Mauro Giavalisco, Carlos Gómez-Guijarro, Andrea Grazian, Norman A. Grogin, Yuchen Guo, Marc Huertas-Company, Shardha Jogee, Jeyhan S. Kartaltepe, Lisa J. Kewley, Allison Kirkpatrick, Dale D. Kocevski, Anton M. Koekemoer, Arianna S. Long, Jennifer M. Lotz, Ray A. Lucas, Casey Papovich, Nor Pirzkal, Swara Ravindranath, Rachel S. Somerville, Sandro Tacchella, Jonathan R. Trump, Weichen Wang, Stephen M. Wilkins, Stijn Wuyts, Guang Yang, L. Y. Aaron Yung, Pérez-González, PG [0000-0003-4528-5639], Barro, G [0000-0001-6813-875X], Annunziatella, M [0000-0002-8053-8040], Costantin, L [0000-0001-6820-0015], García-Argumánez, Á [0000-0002-8365-5525], McGrath, EJ [0000-0001-8688-2443], Mérida, RM [0000-0001-8115-5845], Zavala, JA [0000-0002-7051-1100], Haro, PA [0000-0002-7959-8783], Bagley, MB [0000-0002-9921-9218], Backhaus, BE [0000-0001-8534-7502], Behroozi, P [0000-0002-2517-6446], Bell, EF [0000-0002-5564-9873], Bisigello, L [0000-0003-0492-4924], Buat, V [0000-0003-3441-903X], Calabrò, A [0000-0003-2536-1614], Casey, CM [0000-0002-0930-6466], Cleri, NJ [0000-0001-7151-009X], Coogan, RT [0000-0002-4343-0479], Cooper, MC [0000-0003-1371-6019], Cooray, AR [0000-0002-3892-0190], Dekel, A [0000-0003-4174-0374], Dickinson, M [0000-0001-5414-5131], Elbaz, D [0000-0002-7631-647X], Ferguson, HC [0000-0001-7113-2738], Finkelstein, SL [0000-0001-8519-1130], Fontana, A [0000-0003-3820-2823], Franco, M [0000-0002-3560-8599], Gardner, JP [0000-0003-2098-9568], Giavalisco, M [0000-0002-7831-8751], Gómez-Guijarro, C [0000-0002-4085-9165], Grazian, A [0000-0002-5688-0663], Grogin, NA [0000-0001-9440-8872], Guo, Y [0000-0002-4162-6523], Huertas-Company, M [0000-0002-1416-8483], Jogee, S [0000-0002-1590-0568], Kartaltepe, JS [0000-0001-9187-3605], Kewley, LJ [0000-0001-8152-3943], Kirkpatrick, A [0000-0002-1306-1545], Kocevski, DD [0000-0002-8360-3880], Koekemoer, AM [0000-0002-6610-2048], Long, AS [0000-0002-7530-8857], Lotz, JM [0000-0003-3130-5643], Lucas, RA [0000-0003-1581-7825], Papovich, C [0000-0001-7503-8482], Pirzkal, N [0000-0003-3382-5941], Ravindranath, S [0000-0002-5269-6527], Somerville, RS [0000-0002-6748-6821], Tacchella, S [0000-0002-8224-4505], Trump, JR [0000-0002-1410-0470], Wang, W [0000-0002-9593-8274], Wilkins, SM [0000-0003-3903-6935], Wuyts, S [0000-0003-3735-1931], Yang, G [0000-0001-8835-7722], Aaron Yung, LY [0000-0003-3466-035X], and Apollo - University of Cambridge Repository

Subjects
Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astronomy and Astrophysics, 5109 Space Sciences, 51 Physical Sciences, Astrophysics - Astrophysics of Galaxies
Abstract

The new capabilities that JWST offers in the near- and mid-infrared (IR) are used to investigate in unprecedented detail the nature of optical/near-IR faint, mid-IR bright sources, HST-dark galaxies among them. We gather JWST data from the CEERS survey in the EGS, jointly with HST data, and analyze spatially resolved optical-to-mid-IR spectral energy distributions (SEDs) to estimate both photometric redshifts in 2 dimensions and stellar populations properties in a pixel-by-pixel basis. We select 138 galaxies with F150W-F356W>1.5 mag, F356W100 Gyr^-1); (2) 18% are quiescent/dormant (i.e., subject to reignition and rejuvenation) galaxies at 3, Comment: Published in CEERS ApJL Focus Issue, ApJL 946, L16

Published
2022
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3. CEERS Key Paper I: An Early Look into the First 500 Myr of Galaxy Formation with JWST

Author

Steven L. Finkelstein, Micaela B. Bagley, Henry C. Ferguson, Stephen M. Wilkins, Jeyhan S. Kartaltepe, Casey Papovich, L. Y. Aaron Yung, Pablo Arrabal Haro, Peter Behroozi, Mark Dickinson, Dale D. Kocevski, Anton M. Koekemoer, Rebecca L. Larson, Aurélien Le Bail, Alexa M. Morales, Pablo G. Pérez-González, Denis Burgarella, Romeel Davé, Michaela Hirschmann, Rachel S. Somerville, Stijn Wuyts, Volker Bromm, Caitlin M. Casey, Adriano Fontana, Seiji Fujimoto, Jonathan P. Gardner, Mauro Giavalisco, Andrea Grazian, Norman A. Grogin, Nimish P. Hathi, Taylor A. Hutchison, Saurabh W. Jha, Shardha Jogee, Lisa J. Kewley, Allison Kirkpatrick, Arianna S. Long, Jennifer M. Lotz, Laura Pentericci, Justin D. R. Pierel, Nor Pirzkal, Swara Ravindranath, Russell E. Ryan, Jonathan R. Trump, Guang Yang, Rachana Bhatawdekar, Laura Bisigello, Véronique Buat, Antonello Calabrò, Marco Castellano, Nikko J. Cleri, M. C. Cooper, Darren Croton, Emanuele Daddi, Avishai Dekel, David Elbaz, Maximilien Franco, Eric Gawiser, Benne W. Holwerda, Marc Huertas-Company, Anne E. Jaskot, Gene C. K. Leung, Ray A. Lucas, Bahram Mobasher, Viraj Pandya, Sandro Tacchella, Benjamin J. Weiner, Jorge A. Zavala, Finkelstein, SL [0000-0001-8519-1130], Bagley, MB [0000-0002-9921-9218], Ferguson, HC [0000-0001-7113-2738], Wilkins, SM [0000-0003-3903-6935], Kartaltepe, JS [0000-0001-9187-3605], Papovich, C [0000-0001-7503-8482], Yung, LY [0000-0003-3466-035X], Haro, PA [0000-0002-7959-8783], Behroozi, P [0000-0002-2517-6446], Dickinson, M [0000-0001-5414-5131], Kocevski, DD [0000-0002-8360-3880], Koekemoer, AM [0000-0002-6610-2048], Larson, RL [0000-0003-2366-8858], Le Bail, A [0000-0002-9466-2763], Morales, AM [0000-0003-4965-0402], Pérez-González, PG [0000-0003-4528-5639], Burgarella, D [0000-0002-4193-2539], Davé, R [0000-0003-2842-9434], Hirschmann, M [0000-0002-3301-3321], Somerville, RS [0000-0002-6748-6821], Wuyts, S [0000-0003-3735-1931], Bromm, V [0000-0003-0212-2979], Casey, CM [0000-0002-0930-6466], Fontana, A [0000-0003-3820-2823], Fujimoto, S [0000-0001-7201-5066], Gardner, JP [0000-0003-2098-9568], Giavalisco, M [0000-0002-7831-8751], Grazian, A [0000-0002-5688-0663], Grogin, NA [0000-0001-9440-8872], Hathi, NP [0000-0001-6145-5090], Hutchison, TA [0000-0001-6251-4988], Jha, SW [0000-0001-8738-6011], Jogee, S [0000-0002-1590-0568], Kewley, LJ [0000-0001-8152-3943], Kirkpatrick, A [0000-0002-1306-1545], Long, AS [0000-0002-7530-8857], Lotz, JM [0000-0003-3130-5643], Pentericci, L [0000-0001-8940-6768], Pierel, JDR [0000-0002-2361-7201], Pirzkal, N [0000-0003-3382-5941], Ravindranath, S [0000-0002-5269-6527], Ryan, RE [0000-0003-0894-1588], Trump, JR [0000-0002-1410-0470], Yang, G [0000-0001-8835-7722], Bhatawdekar, R [0000-0003-0883-2226], Bisigello, L [0000-0003-0492-4924], Buat, V [0000-0003-3441-903X], Calabrò, A [0000-0003-2536-1614], Castellano, M [0000-0001-9875-8263], Cleri, NJ [0000-0001-7151-009X], Cooper, MC [0000-0003-1371-6019], Croton, D [0000-0002-5009-512X], Daddi, E [0000-0002-3331-9590], Dekel, A [0000-0003-4174-0374], Elbaz, D [0000-0002-7631-647X], Franco, M [0000-0002-3560-8599], Gawiser, E [0000-0003-1530-8713], Holwerda, BW [0000-0002-4884-6756], Huertas-Company, M [0000-0002-1416-8483], Jaskot, AE [0000-0002-6790-5125], Leung, GCK [0000-0002-9393-6507], Lucas, RA [0000-0003-1581-7825], Mobasher, B [0000-0001-5846-4404], Pandya, V [0000-0002-2499-9205], Tacchella, S [0000-0002-8224-4505], Weiner, BJ [0000-0001-6065-7483], Zavala, JA [0000-0002-7051-1100], and Apollo - University of Cambridge Repository

Subjects
epoch simulations flares, cosmology legacy survey, deblended dust emission, uv luminosity functions, ultra-deep field, hubble frontier fields, FOS: Physical sciences, Astronomy and Astrophysics, initial mass function, 5109 Space Sciences, space-telescope observations, Astrophysics - Astrophysics of Galaxies, Space and Planetary Science, similar-to 10, Astrophysics of Galaxies (astro-ph.GA), 51 Physical Sciences, high-redshift galaxies
Abstract

We present an investigation into the first 500 Myr of galaxy evolution from the Cosmic Evolution Early Release Science (CEERS) survey. CEERS, one of 13 JWST ERS programs, targets galaxy formation from z~0.5 to z>10 using several imaging and spectroscopic modes. We make use of the first epoch of CEERS NIRCam imaging, spanning 35.5 sq. arcmin, to search for candidate galaxies at z>9. Following a detailed data reduction process implementing several custom steps to produce high-quality reduced images, we perform multi-band photometry across seven NIRCam broad and medium-band (and six Hubble broadband) filters focusing on robust colors and accurate total fluxes. We measure photometric redshifts and devise a robust set of selection criteria to identify a sample of 26 galaxy candidates at z~9-16. These objects are compact with a median half-light radius of ~0.5 kpc. We present an early estimate of the z~11 rest-frame ultraviolet (UV) luminosity function, finding that the number density of galaxies at M_UV ~ -20 appears to evolve very little from z~9 to z~11. We also find that the abundance (surface density [arcmin^-2]) of our candidates exceeds nearly all theoretical predictions. We explore potential implications, including that at z>10 star formation may be dominated by top-heavy initial mass functions, which would result in an increased ratio of UV light per unit halo mass, though a complete lack of dust attenuation and/or changing star-formation physics may also play a role. While spectroscopic confirmation of these sources is urgently required, our results suggest that the deeper views to come with JWST should yield prolific samples of ultra-high-redshift galaxies with which to further explore these conclusions., 41 pages, 20 figures, 6 tables, submitted to ApJL. Key results in Figures 13-15, discussed in Sections 7 and 8

Published
2022
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4. Mass and Environment as Drivers of Galaxy Evolution. IV. On the Quenching of Massive Central Disk Galaxies in The Local Universe

Author

Alvio Renzini, Qiong Li, Luis C. Ho, Roberto Maiolino, Qi Guo, Avishai Dekel, Filippo Mannucci, Chengpeng Zhang, Simon J. Lilly, Feng Yuan, Kexin Guo, Jingjing Shi, Zhongyi Man, Yingjie Peng, Jing Dou, Di Li, Zhang, C [0000-0001-6469-1582], Ho, LC [0000-0001-6947-5846], Renzini, A [0000-0002-7093-7355], Mannucci, F [0000-0002-4803-2381], Dekel, A [0000-0003-4174-0374], Li, D [0000-0003-3010-7661], Yuan, F [0000-0003-3564-6437], Lilly, SJ [0000-0002-6423-3597], Dou, J [0000-0002-6961-6378], Guo, K [0000-0001-6103-2821], Man, Z [0000-0001-9463-2444], Li, Q [0000-0002-3119-9003], Shi, J [0000-0001-9879-4926], and Apollo - University of Cambridge Repository

Subjects
Physics, 010504 meteorology & atmospheric sciences, Stellar mass, Star formation, astro-ph.GA, Velocity dispersion, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Mass ratio, 01 natural sciences, Astrophysics - Astrophysics of Galaxies, Galaxy, Barred spiral galaxy, Space and Planetary Science, Bulge, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, Galaxy formation and evolution, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences
Abstract

The phenomenological study of evolving galaxy populations has shown that star forming galaxies can be quenched by two distinct processes: mass quenching and environment quenching (Peng et al. 2010). To explore the mass quenching process in local galaxies, we study the massive central disk galaxies with stellar mass above the Schechter characteristic mass. In Zhang et al. (2019), we showed that during the quenching of the massive central disk galaxies as their star formation rate (SFR) decreases, their molecular gas mass and star formation efficiency drop rapidly, but their HI gas mass remains surprisingly constant. To identify the underlying physical mechanisms, in this work we analyze the change during quenching of various structure parameters, bar frequency, and active galactic nucleus (AGN) activity. We find three closely related facts. On average, as SFR decreases in these galaxies: (1) they become progressively more compact, indicated by their significantly increasing concentration index, bulge-to-total mass ratio, and central velocity dispersion, which are mainly driven by the growth and compaction of their bulge component; (2) the frequency of barred galaxies increases dramatically, and at a given concentration index the barred galaxies have a significantly higher quiescent fraction than unbarred galaxies, implying that the galactic bar may play an important role in mass quenching; and (3) the "AGN" frequency increases dramatically from 10% on the main sequence to almost 100% for the most quiescent galaxies, which is mainly driven by the sharp increase of LINERs. These observational results lead to a self-consistent picture of how mass quenching operates., Comment: 20 pages, 11 figures. Published in ApJ

Published
2021
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5. Implications of Increased Central Mass Surface Densities for the Quenching of Low-mass Galaxies

Author

Dale D. Kocevski, Avishai Dekel, Timothy Carleton, S. M. Faber, Anton M. Koekemoer, David C. Koo, Zhu Chen, Pablo G. Pérez-González, Mauro Giavalisco, Eric F. Bell, Seong-Kook Lee, Casey Papovich, Yicheng Guo, F. S. Liu, Peter Kurczynski, Guo, Y. [0000-0003-2775-2002], Carleton, T. [0000-0001-6650-2853], Bell, E. F. [0000-0002-5564-9873], Chen, Z. [0000-0002-2326-0476], Dekel, A. [0000-0003-4174-0374], Fabel, S. M. [0000-0003-4996-214X], Giavalisco, M. [0000-0002-7831-8751], Kocevski, D. D. [0000-0002-8360-3880], Koekemoer, A. M. [0000-0002-6610-2048], Koo, D. C. [0000-0003-3385-6799], Kurczynski, P. [0000-0002-8816-5146], Lee, S. K. [0000-0001-5342-8906], Liu, F. S. [0000-0002-1064-1544], Papovich, C. [0000-0001-7503-8482], Pérez González, P. G. [0000-0003-4528-5639], National Science Foundation (NSF), National Aeronautics and Space Administration (NASA), and National Research Foundation of Korea (NRF)

Subjects
Galaxy structure, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010504 meteorology & atmospheric sciences, Stellar mass, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Extragalactic astronomy, Galaxy evolution, 0103 physical sciences, 010303 astronomy & astrophysics, Dwarf galaxies, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Physics, Quenching, Galaxy formation, Quenched galaxies, Star formation, Sigma, Astronomy and Astrophysics, Radius, Astrophysics - Astrophysics of Galaxies, Galaxy environments, Redshift, Galaxy, Galaxy physics, Galaxy quenching, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Astrophysics::Earth and Planetary Astrophysics, Low Mass, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We use the Cosmic Assembly Deep Near-infrared Extragalactic Legacy Survey (CANDELS) data to study the relationship between quenching and the stellar mass surface density within the central radius of 1 kpc ($\Sigma_1$) of low-mass galaxies (stellar mass $M_* \lesssim 10^{9.5} M_\odot$) at $0.5 \leq z < 1.5$. Our sample is mass complete down to $\sim 10^9 M_\odot$ at $0.5 \leq z < 1.0$. We compare the mean $\Sigma_1$ of star-forming galaxies (SFGs) and quenched galaxies (QGs) at the same redshift and $M_*$. We find that low-mass QGs have higher $\Sigma_1$ than low-mass SFGs, similar to galaxies above $10^{10} M_\odot$. The difference of $\Sigma_1$ between QGs and SFGs increases slightly with $M_*$ at $M_* \lesssim 10^{10} M_\odot$ and decreases with $M_*$ at $M_* \gtrsim 10^{10} M_\odot$. The turnover mass is consistent with the mass where quenching mechanisms transition from internal to environmental quenching. At $0.5 \leq z < 1.0$, we find that the $\Sigma_1$ of galaxies increases by about 0.25 dex in the green valley (i.e., the transitioning region from star forming to fully quenched), regardless of their $M_*$. Using the observed specific star formation rate (sSFR) gradient in the literature as a constraint, we estimate that the quenching timescale (i.e., time spent in the transition) of low-mass galaxies is a few ($\sim4$) Gyrs at $0.5 \leq z < 1.0$. The mechanisms responsible for quenching need to gradually quench star formation in an outside-in way, i.e., preferentially ceasing star formation in outskirts of galaxies while maintaining their central star formation to increase $\Sigma_1$. An interesting and intriguing result is the similarity of the growth of $\Sigma_1$ in the green valley between low-mass and massive galaxies, which suggests that the role of internal processes in quenching low-mass galaxies is a question worthy of further investigation., Comment: 12 pages, 11 figures. Accepted by ApJ

Published
2021
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6. Nearly all Massive Quiescent Disk Galaxies Have a Surprisingly Large Atomic Gas Reservoir

Author

Roberto Maiolino, Filippo Mannucci, Di Li, Qi Guo, Avishai Dekel, Kexin Guo, Zhongyi Man, Chengpeng Zhang, Jing Dou, Feng Yuan, Qiong Li, Luis C. Ho, Yingjie Peng, Alvio Renzini, Zhang, C [0000-0001-6469-1582], Ho, LC [0000-0001-6947-5846], Maiolino, R [0000-0002-4985-3819], Dekel, A [0000-0003-4174-0374], Mannucci, F [0000-0002-4803-2381], Li, D [0000-0003-3010-7661], Yuan, F [0000-0003-3564-6437], Renzini, A [0000-0002-7093-7355], Guo, K [0000-0001-6103-2821], Man, Z [0000-0001-9463-2444], Li, Q [0000-0002-3119-9003], Apollo - University of Cambridge Repository, ITA, USA, GBR, ISR, and CHN

Subjects
010504 meteorology & atmospheric sciences, Stellar mass, media_common.quotation_subject, astro-ph.GA, Population, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Spectral line, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, education, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, media_common, Physics, education.field_of_study, Star formation, Hot dark matter, Gas supply, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Galaxy, Universe, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Astrophysics::Earth and Planetary Astrophysics
Abstract

The massive galaxy population above the characteristic Schechter mass M*~10^10.6 Msun contributes to about half of the total stellar mass in the local Universe. These massive galaxies usually reside in hot dark matter haloes above the critical shock-heating mass ~10^12 Msun, where the external cold gas supply to these galaxies is expected to be suppressed. When galaxies run out of their cold gas reservoir, they become dead and quiescent. Therefore, massive quiescent galaxies living in hot haloes are commonly believed to be gas-poor. Based on the data from SDSS, ALFALFA, GASS and COLD GASS surveys, here we show that the vast majority of the massive, quiescent, central disk galaxies in the nearby Universe have a remarkably large amount of cold atomic hydrogen gas, surprisingly similar to star-forming galaxies. Both star-forming and quiescent disk galaxies show identical symmetric double-horn HI spectra, indicating similar regularly rotating HI disks. Relative to their star-forming counterparts, massive quiescent central disk galaxies are quenched because of their significantly reduced molecular gas content, lower dust content, and lower star formation efficiency. Our findings reveal a new picture, which clearly demonstrates the detailed star-formation quenching process in massive galaxies and provides a stringent constraint on the physical mechanism of quenching., 10 pages, 4 figures (+2 figures in the appendix); accepted for publication in The Astrophysical Journal Letters

Published
2019
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