A HIGHLY CONSISTENT FRAMEWORK FOR THE EVOLUTION OF THE STAR-FORMING "MAIN SEQUENCE" FROM z ∼ 0-6

被引：1317

作者：

Speagle, J. S. ^{[1
,2
]}

Steinhardt, C. L. ^{[2
,3
,4
]}

Capak, P. L. ^{[3
,4
]}

Silverman, J. D. ^{[2
]}

机构：

[1] Harvard Univ, Dept Astron, Cambridge, MA 02138 USA

[2] Univ Tokyo, Kavli IPMU, Chiba 2778583, Japan

[3] CALTECH, Pasadena, CA 91125 USA

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

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2014年 / 214卷 / 02期

关键词：

galaxies: evolution; galaxies: star formation; radio continuum: galaxies; surveys; LYMAN-BREAK GALAXIES; HIGH-REDSHIFT GALAXIES; INITIAL MASS FUNCTION; ORIGINS DEEP SURVEY; GOODS-SOUTH FIELD; SPECTRAL ENERGY-DISTRIBUTIONS; DIGITAL SKY SURVEY; INFRARED LUMINOSITY FUNCTIONS; STELLAR POPULATION SYNTHESIS; LESS-THAN;

D O I：

10.1088/0067-0049/214/2/15

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using a compilation of 25 studies from the literature, we investigate the evolution of the star-forming galaxy (SFG) main sequence (MS) in stellar mass and star formation rate (SFR) out to z similar to 6. After converting all observations to a common set of calibrations, we find a remarkable consensus among MS observations (similar to 0.1 dex 1 sigma interpublication scatter). By fitting for time evolution of the MS in bins of constant mass, we deconvolve the observed scatter about the MS within each observed redshift bin. After accounting for observed scatter between different SFR indicators, we find the width of the MS distribution is similar to 0.2 dex and remains constant over cosmic time. Our best fits indicate the slope of the MS is likely time-dependent, with our best-fit log SFR(M-*, t) = (0.84 +/- 0.02 - 0.026 +/- 0.003 x t) logM(*) -(6.51 +/- 0.24 - 0.11 +/- 0.03 x t), where t is the age of the universe in Gyr. We use our fits to create empirical evolutionary tracks in order to constrain MS galaxy star formation histories (SFHs), finding that (1) the most accurate representations of MS SFHs are given by delayed-tau models, (2) the decline in fractional stellar mass growth for a "typical" MS galaxy today is approximately linear for most of its lifetime, and (3) scatter about the MS can be generated by galaxies evolving along identical evolutionary tracks assuming an initial 1s spread in formation times of similar to 1.4 Gyr.

引用

页数：52

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