The ALMA Reionization Era Bright Emission Line Survey: The molecular gas content of galaxies at z ∼ 7

被引：13

作者：

Aravena, M. ^{[1
]}

Heintz, K. ^{[2
,3
]}

Dessauges-Zavadsky, M. ^{[4
]}

Oesch, P. ^{[2
,3
,4
]}

Algera, H. ^{[5
,6
]}

Bouwens, R. ^{[7
]}

da Cunha, E. ^{[8
]}

Dayal, P. ^{[9
]}

De Looze, I. ^{[10
]}

Ferrara, A. ^{[11
]}

Fudamoto, Y. ^{[12
]}

Gonzalez, V. ^{[13
]}

Graziani, L. ^{[14
,15
]}

Hygate, A. P. S. ^{[7
]}

Inami, H. ^{[5
]}

Pallottini, A. ^{[11
]}

Schneider, R. ^{[14
,15
,16
,17
]}

Schouws, S. ^{[7
]}

Sommovigo, L. ^{[14
]}

Topping, M. ^{[18
]}

van der Werf, P. ^{[7
]}

Palla, M.

机构：

[1] Univ Diego Portales, Inst Estudios Astrofis, Fac Ingn & Ciencias, Ave Ejercito 441, Santiago 8370191, Chile

[2] Cosm Dawn Ctr DAWN, Radmandsgade 64, DK-2200 Copenhagen N, Denmark

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

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

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

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

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

[8] Univ Western Australia, Int Ctr Radio Astron Res, 35 Stirling Hwy, Crawley, WA 6009, Australia

[9] Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands

[10] Univ Ghent, Sterrenkundig Observ, Krijgslaan 281-S9, B-9000 Ghent, Belgium

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

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

[13] Univ Chile, Dept Astron, Casilla 36-D, Santiago 7591245, Chile

[14] Sapienza Univ Roma, Dipartimento Fis, Piazza le Aldo Moro 5, I-00185 Rome, Italy

[15] INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Rome, Italy

[16] Sapienza Univ Roma, Sapienza Sch Adv Studies, Ple Aldo Moro 2, I-00185 Rome, Italy

[17] INFN, Sez Roma 1, Ple Aldo Moro 2, I-00185 Rome, Italy

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

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 682卷

关键词：

galaxies: evolution; galaxies: high-redshift; galaxies: ISM; ISM: molecules; STAR-FORMING GALAXIES; ULTRA DEEP FIELD; CO LUMINOSITY FUNCTIONS; SPECTROSCOPIC SURVEY; HIGH-REDSHIFT; MAIN-SEQUENCE; INTERSTELLAR-MEDIUM; SCALING RELATIONS; REBELS SURVEY; COSMIC TIME;

D O I：

10.1051/0004-6361/202347281

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A key to understanding the formation of the first galaxies is to quantify the content of the molecular gas as the fuel for star formation activity through the epoch of reionization. In this paper, we use the 158 mu m [C II] fine-structure emission line as a tracer of the molecular gas in the interstellar medium (ISM) in a sample of z = 6.5-7.5 galaxies recently unveiled by the Reionization Era Bright Line Emission Survey, REBELS, with the Atacama Large Millimeter/submillimeter Array. We find substantial amounts of molecular gas (similar to 10(10.5) M-circle dot), comparable to those found in lower-redshift galaxies for similar stellar masses (similar to 10(10) M-circle dot). The REBELS galaxies appear to follow the standard scaling relations of the molecular gas-to-stellar mass ratio (mu(mol)) and the gas-depletion timescale (t(dep)) with distance to the star-forming main sequence expected from extrapolations of z similar to 1-4 observations. We find median values at z similar to 7 of mu(mol) = 2.6(-1.4)(4.1) and t(dep) = 0.5(-0.14)(+0.26) Gyr, indicating that the baryonic content of these galaxies is dominated by the gas phase and evolves little from z similar to 7 to 4. Our measurements of the cosmic density of molecular gas, log(rho(mol)/(M-circle dot Mpc(-3))) = 6.34(-0.31)(+0.34), indicate a steady increase by an order of magnitude from z similar to 7 to 4.

引用

页数：11

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