The Evolution of the Baryons Associated with Galaxies Averaged over Cosmic Time and Space
文献类型：期刊论文
| 作者 | Walter,Fabian3,4; Carilli,Chris4; Neeleman,Marcel3; Decarli,Roberto5; Popping,Gerg?6; Somerville,Rachel S.7,8; Aravena,Manuel9; Bertoldi,Frank10; Boogaard,Leindert11; Cox,Pierre12 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-10-01 |
| 卷号 | 902期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | Galaxy evolution High-redshift galaxies Interstellar medium Molecular gas |
| DOI | 10.3847/1538-4357/abb82e |
| 英文摘要 | Abstract We combine the recent determination of the evolution of the cosmic density of molecular gas (H2) using deep, volumetric surveys, with previous estimates of the cosmic density of stellar mass, star formation rate and atomic gas (H i), to constrain the evolution of baryons associated with galaxies averaged over cosmic time and space. The cosmic H i and H2 densities are roughly equal at z?～?1.5. The H2 density then decreases by a factor to today’s value, whereas the H i density stays approximately constant. The stellar mass density is increasing continuously with time and surpasses that of the total gas density (H i and H2) at redshift z?～?1.5. The growth in stellar mass cannot be accounted for by the decrease in cosmic H2 density, necessitating significant accretion of additional gas onto galaxies. With the new H2 constraints, we postulate and put observational constraints on a two-step gas accretion process: (i) a net infall of ionized gas from the intergalactic/circumgalactic medium to refuel the extended H i reservoirs, and (ii) a net inflow of H i and subsequent conversion to H2 in the galaxy centers. Both the infall and inflow rate densities have decreased by almost an order of magnitude since z?～?2. Assuming that the current trends continue, the cosmic molecular gas density will further decrease by about a factor of two over the next 5 Gyr, the stellar mass will increase by approximately 10%, and cosmic star formation activity will decline steadily toward zero, as the gas infall and accretion shut down. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-902-2-ABB82E |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/57602]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.SKA Organization, Lower Withington Macclesfield, Cheshire SK11 9DL, UK 2.Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile Av. Vicu?a Mackenna 4860, 782-0436 Macul, Santiago, Chile 3.Max Planck Institute for Astronomy, K?nigstuhl 17, D-69117 Heidelberg, Germany; walter@mpia.de 4.National Radio Astronomy Observatory, Pete V. Domenici Array Science Center, P.O. Box O, Socorro, NM 87801, USA 5.INAFOsservatorio di Astrofisica e Scienza dello Spazio, via Gobetti 93/3, I-40129, Bologna, Italy 6.European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748, Garching, Germany 7.Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA 8.Center for Computational Astrophysics, Flatiron Institute, 162 5th Avenue, New York, NY 10010, USA 9.Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército 441, Santiago, Chile 10.Argelander-Institut für Astronomie, Universit?t Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany |
| 推荐引用方式 GB/T 7714 | Walter,Fabian,Carilli,Chris,Neeleman,Marcel,et al. The Evolution of the Baryons Associated with Galaxies Averaged over Cosmic Time and Space[J]. The Astrophysical Journal,2020,902(2). |
| APA | Walter,Fabian.,Carilli,Chris.,Neeleman,Marcel.,Decarli,Roberto.,Popping,Gerg?.,...&Yung,L. Y. Aaron.(2020).The Evolution of the Baryons Associated with Galaxies Averaged over Cosmic Time and Space.The Astrophysical Journal,902(2). |
| MLA | Walter,Fabian,et al."The Evolution of the Baryons Associated with Galaxies Averaged over Cosmic Time and Space".The Astrophysical Journal 902.2(2020). |
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