THE EVOLUTION OF THE GALAXY STELLAR MASS FUNCTION AT z=4-8: A STEEPENING LOW-MASS-END SLOPE WITH INCREASING REDSHIFT

被引：186

作者：

Song, Mimi ^{[1
]}

Finkelstein, Steven L. ^{[1
]}

Ashby, Matthew L. N. ^{[2
]}

Grazian, A. ^{[3
]}

Lu, Yu ^{[4
]}

Papovich, Casey ^{[5
]}

Salmon, Brett ^{[5
]}

Somerville, Rachel S. ^{[6
]}

Dickinson, Mark ^{[7
]}

Duncan, K. ^{[8
,9
]}

Faber, Sandy M. ^{[10
]}

Fazio, Giovanni G. ^{[2
]}

Ferguson, Henry C. ^{[11
]}

Fontana, Adriano ^{[3
]}

Guo, Yicheng ^{[10
]}

Hathi, Nimish ^{[12
]}

Lee, Seong-Kook ^{[13
]}

Merlin, Emiliano ^{[3
]}

Willner, S. P. ^{[2
]}

机构：

[1] Univ Texas Austin, Dept Astron, C1400, Austin, TX 78712 USA

[2] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[3] Osserv Astron Roma, INAF, Via Frascati 33, I-00040 Monte Porzio Catone, Italy

[4] Carnegie Inst Sci, Observ, Pasadena, CA 91101 USA

[5] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[6] Rutgers State Univ, Dept Phys & Astron, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA

[7] Natl Opt Astron Observ, Tucson, AZ 85719 USA

[8] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

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

[10] Univ Calif Santa Cruz, Lick Observ, Univ Calif Observ, Santa Cruz, CA 95064 USA

[11] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[12] Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France

[13] Seoul Natl Univ, CEOU, Astron Program, Dept Phys & Astron, Seoul 151742, South Korea

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 825卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: luminosity function; mass function; ULTRA DEEP FIELD; STAR-FORMING GALAXIES; HUBBLE-SPACE-TELESCOPE; SIMILAR-TO; 8; SPECTRAL ENERGY-DISTRIBUTIONS; LYMAN-BREAK GALAXIES; ULTRAVIOLET LUMINOSITY FUNCTION; EXTRAGALACTIC LEGACY SURVEY; SURVEY. SURVEY DESIGN; DIGITAL SKY SURVEY;

D O I：

10.3847/0004-637X/825/1/5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present galaxy stellar mass functions (GSMFs) at z = 4-8 from a rest-frame ultraviolet (UV) selected sample of similar to 4500 galaxies, found via photometric redshifts over an area of similar to 280 arcmin(2) in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS)/Great Observatories Origins Deep Survey (GOODS) fields and the Hubble Ultra Deep Field. The deepest Spitzer/IRAC data to date and the relatively large volume allow us to place a better constraint at both the low- and high-mass ends of the GSMFs compared to previous space-based studies from pre-CANDELS observations. Supplemented by a stacking analysis, we find a linear correlation between the rest-frame UV absolute magnitude at 1500 angstrom (M-UV) and logarithmic stellar mass (log M-*) that holds for galaxies with log(M-*/M-circle dot) less than or similar to 10. We use simulations to validate our method of measuring the slope of the log M-*-M-UV relation, finding that the bias is minimized with a hybrid technique combining photometry of individual bright galaxies with stacked photometry for faint galaxies. The resultant measured slopes do not significantly evolve over z = 4-8, while the normalization of the trend exhibits a weak evolution toward lower masses at higher redshift. We combine the log M-*-M-UV distribution with observed rest-frame UV luminosity functions at each redshift to derive the GSMFs, finding that the low-mass-end slope becomes steeper with increasing redshift from alpha = -1.55(-0.07)(+0.08) at z = 4 to alpha = -2.25(-0.35)(+0.72) at z = 8. The inferred stellar mass density, when integrated over M-* = 10(8)-10(13) M-circle dot, increases by a factor of 10(-2)(+30) between z = 7 and z = 4 and is in good agreement with the time integral of the cosmic star formation rate density.

引用

页数：25

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