The Neutral Hydrogen Cosmological Mass Density at z=5

被引：0

作者：

Crighton, Neil H. M. ^{[1
]}

Murphy, Michael T. ^{[1
]}

Prochaska, J. Xavier ^{[2
]}

Worseck, Gabor ^{[3
]}

Rafelski, Marc ^{[4
]}

Becker, George D. ^{[5
]}

Ellison, Sara L. ^{[6
]}

Fumagalli, Michele ^{[7
,8
]}

Lopez, Sebastian ^{[9
]}

Meiksin, Avery ^{[10
]}

O'Meara, John M. ^{[11
]}

机构：

[1] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

[2] Univ Calif Santa Cruz, Dept Astron & Astrophys, UCO Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA

[3] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[4] CALTECH, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA

[5] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[6] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada

[7] Univ Durham, Dept Phys, Inst Computat Cosmol, South Rd, Durham DH1 3LE, England

[8] Carnegie Observ, 813 Santa Barbara St, Pasadena, CA 91101 USA

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

[10] Univ Edinburgh, Scottish Univ Phys Alliance, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[11] St Michaels Coll, Dept Chem & Phys, One Winooski Pk, Colchester, VT 05439 USA

来源：

FORMATION AND EVOLUTION OF GALAXY OUTSKIRTS | 2016年 / 11卷 / S321期

关键词：

LYMAN-ALPHA SYSTEMS; LIMIT ABSORPTION; OMEGA(H I); GALAXIES; EVOLUTION; GAS; QUASARS;

D O I：

10.1017/S1743921316011595

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the largest homogeneous survey of redshift > 4.4 damped Lya systems (DLAs) using the spectra of 163 quasars that comprise the Giant Gemini GMOS (GGG) survey. With this survey we make the most precise high-redshift measurement of the cosmological mass density of neutral hydrogen, Omega(HI). After correcting for systematic effects using a combination of mock and higher-resolution spectra, we find Omega(HI) = 0.98(-0.18)(+0.20) x 10(-3) at < z > = 4.9, assuming a 20% contribution from lower column density systems below the DLA threshold. By comparing to literature measurements at lower redshifts, we show that OHI can be described by the functional form Omega(HI)(z). (1 + z) 0.4. This gradual decrease from z = 5 to 0 suggests that in the galaxies which dominate the cosmic star formation rate, H i is a transitory gas phase fuelling star formation which must be continually replenished by more highly-ionized gas from the intergalactic medium, and from recycled galactic winds.

引用

页码：309 / 314

页数：6

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