The ALMA REBELS Survey: The Cosmic H i Gas Mass Density in Galaxies at z ≈ 7

被引：30

作者：

Heintz, K. E. ^{[1
,2
]}

Oesch, P. A. ^{[1
,2
,3
]}

Aravena, M. ^{[4
]}

Bouwens, R. J. ^{[5
]}

Dayal, P. ^{[6
]}

Ferrara, A. ^{[7
]}

Fudamoto, Y. ^{[8
,9
]}

Graziani, L. ^{[10
,11
]}

Inami, H. ^{[12
]}

Sommovigo, L. ^{[7
]}

Smit, R. ^{[13
]}

Stefanon, M. ^{[14
]}

Topping, M. ^{[15
]}

Pallottini, A. ^{[7
]}

van der Werf, P. ^{[5
]}

机构：

[1] Cosm Dawn Ctr DAWN, Copenhagen, Denmark

[2] Univ Copenhagen, Niels Bohr Inst, Jagtvej 128, DK-2200 Copenhagen N, Denmark

[3] Univ Geneva, Dept Astron, Chemin Pegasi 51, CH-1290 Versoix, Switzerland

[4] Univ Diego Portales, Fac Ingn & Ciencias, Nucleo Astron, Av Ejercito 441, Santiago, Chile

[5] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[6] Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AB Groningen, Netherlands

[7] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy

[8] Waseda Univ, Waseda Res Inst Sci & Engn, Fac Sci & Engn, Shinjuku Ku, 3-4-1 Okubo, Tokyo 1698555, Japan

[9] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo, Japan

[10] Sapienza Univ Roma, Dipartimento Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy

[11] Osserv Astron Roma, INAF, Via Frascati 33, I-00078 Rome, Italy

[12] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 7398526, Japan

[13] Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England

[14] Univ Valencia, Dept Astron & Astrofis, C Dr Moliner 50, E-46100 Valencia, Spain

[15] Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2022年 / 934卷 / 02期

基金：

新加坡国家研究基金会; 欧盟地平线“2020”; 欧洲研究理事会;

关键词：

STAR-FORMING GALAXIES; MOLECULAR GAS; INTERSTELLAR-MEDIUM; SCALING RELATIONS; DUST CONTENT; REDSHIFT; EMISSION; EVOLUTION; EPOCH; REIONIZATION;

D O I：

10.3847/2041-8213/ac8057

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The neutral atomic gas content of individual galaxies at large cosmological distances has until recently been difficult to measure due to the weakness of the hyperfine H I 21 cm transition. Here we estimate the H I gas mass of a sample of main-sequence star-forming galaxies at z similar to 6.5-7.8 surveyed for [C II] 158 mu m emission as part of the Reionization Era Bright Emission Line Survey (REBELS), using a recent calibration of the [C II]-to-H I conversion factor. We find that the H I gas mass excess in galaxies increases as a function of redshift, with an average of M-HI /M-star approximate to 10, corresponding to H I gas mass fractions of f(HI) = M-HI /(M-star + M-HI) = 90%, at z approximate to 7. Based on the [C II] 158 mu m luminosity function (LF) derived from the same sample of galaxies, we further place constraints on the cosmic H I gas mass density in galaxies (rho(HI)) at this redshift, which we measure to be rho(HI) = 7.1(-3.0)(+6.4) x 10(6) M-circle dot Mpc(-3). This estimate is substantially lower by a factor of approximate to 10 than that inferred from an extrapolation of damped Ly alpha absorber (DLA) measurements and largely depends on the exact [C II] LF adopted. However, we find this decrease in rho(HI) to be consistent with recent simulations and argue that this apparent discrepancy is likely a consequence of the DLA sight lines predominantly probing the substantial fraction of H I gas in high-z galactic halos, whereas [C II] traces the H I in the ISM associated with star formation. We make predictions for this buildup of neutral gas in galaxies as a function of redshift, showing that at z greater than or similar to 5, only approximate to 10% of the cosmic H I gas content is confined in galaxies and associated with the star-forming ISM.

引用

页数：8

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