Where stars form and live at high redshift: clues from the infrared

被引：33

作者：

Bethermin, M. ^{[1
,2
,3
,4
]}

Dore, O. ^{[5
]}

Lagache, G. ^{[2
,3
,4
]}

机构：

[1] Univ Paris Diderot, CNRS, Lab AIM Paris Saclay, CEA,DSM,Irfu, Saclay, France

[2] Inst Astrophys Spatiale IAS, F-91405 Orsay, France

[3] Univ Paris 11, Paris, France

[4] CNRS, UMR8617, F-75700 Paris, France

[5] CALTECH, Jet Prop Lab, Pasadena, CA USA

来源：

ASTRONOMY & ASTROPHYSICS | 2012年 / 537卷

关键词：

galaxies: star formation; galaxies: statistics; galaxies: halos; dark matter; infrared: galaxies; STELLAR MASS FUNCTION; LESS-THAN; 2; HALO MASS; LUMINOSITY FUNCTION; GAS CLOUDS; GALAXIES; EVOLUTION; FRAGMENTATION; MORPHOLOGY; SAMPLE;

D O I：

10.1051/0004-6361/201118607

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The relation between dark matter halos and the loci of star formation at high redshift is a pressing question in contemporary cosmology. Matching the abundance of halos to the abundance of infrared (IR) galaxies, we explore the link between dark matter halo mass (M-h), stellar mass (M-*) and star-formation rate (SFR) up to a redshift of 2. Our findings are five-fold. First, we find a strong evolution of the relation between M-* and SFR as a function of redshift with an increase of sSFR = SFR/M-* by a factor similar to 30 between z = 0 and z = 2.3. Second, we observe a decrease of sSFR with stellar mass. These results reproduce observed trends at redshift z > 0.3. Third, we find that the star formation is most efficient in dark matter halos with M-h similar or equal to 5 x 10(11) M-circle dot, with hints of an increase of this mass with redshift. Fourth, we find that SFR/M-h increases by a factor similar to 15 between z = 0 and z = 2.3. Finally we find that the SFR density is dominated by halo masses close to similar to 7 x 10(11) M-circle dot at all redshift, with a rapid decrease at lower and higher halo masses. Despite its simplicity, our novel use of IR observations unveils some characteristic mass-scales governing star formation at high redshift.

引用

页数：4

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