Evolution of the dust emission of massive galaxies up to z=4 and constraints on their dominant mode of star formation

被引：241

作者：

Bethermin, Matthieu ^{[1
,2
]}

Daddi, Emanuele ^{[2
]}

Magdis, Georgios ^{[3
]}

Lagos, Claudia ^{[1
]}

Sargent, Mark ^{[4
]}

Albrecht, Marcus ^{[5
]}

Aussel, Herve ^{[2
]}

Bertoldi, Frank ^{[5
]}

Buat, Veronique ^{[6
]}

Galametz, Maud ^{[1
]}

Heinis, Sebastien ^{[7
]}

Ilbert, Olivier ^{[6
]}

Karim, Alexander ^{[5
]}

Koekemoer, Anton ^{[8
]}

Lacey, Cedric ^{[9
]}

Le Floc'h, Emeric ^{[2
]}

Navarrete, Felipe ^{[5
]}

Pannella, Maurilio ^{[2
]}

Schreiber, Corentin ^{[2
]}

Smolcic, Vernesa ^{[10
]}

Symeonidis, Myrto ^{[4
,11
]}

Viero, Marco ^{[12
]}

机构：

[1] European So Observ, D-85748 Garching, Germany

[2] Univ Paris Diderot, CEA Saclay, CNRS, Lab AIM Paris Saclay,CEA,DSM,Irfu, F-91191 Gif Sur Yvette, France

[3] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[4] Univ Sussex, Dept Phys & Astron, Ctr Astron, Brighton BN1 9QH, E Sussex, England

[5] Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany

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

[7] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

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

[9] Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England

[10] Univ Zagreb, Dept Phys, Zagreb 10002, Croatia

[11] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

[12] CALTECH, Pasadena, CA 91125 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 573卷

基金：

欧洲研究理事会;

关键词：

galaxies: formation; galaxies: evolution; galaxies: high-redshift; galaxies: star formation; infrared: galaxies; submillimeter: galaxies; LYMAN BREAK GALAXIES; SIMILAR-TO; 2; INFRARED LUMINOSITY FUNCTIONS; MOLECULAR GAS CONTENT; FORMING GALAXIES; STELLAR MASS; SUBMILLIMETER GALAXIES; MAIN-SEQUENCE; HIGH-REDSHIFT; HALO MASS;

D O I：

10.1051/0004-6361/201425031

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We aim to measure the average dust and molecular gas content of massive star-forming galaxies (>3 x 10(10) M-circle dot) up to z = 4 in the COSMOS field to determine if the intense star formation observed at high redshift is induced by major mergers or is caused by large gas reservoirs. Firstly, we measured the evolution of the average spectral energy distributions as a function of redshift using a stacking analysis of Spitzer, Herschel, LABOCA, and AzTEC data for two samples of galaxies: normal star-forming objects and strong starbursts, as defined by their distance to the main sequence. We found that the mean intensity of the radiation field < U > heating the dust (strongly correlated with dust temperature) increases with increasing redshift up to z = 4 in main-sequence galaxies. We can reproduce this evolution with simple models that account for the decrease in the gas metallicity with redshift. No evolution of < U > with redshift is found in strong starbursts. We then deduced the evolution of the molecular gas fraction (defined here as M-mol/(M-mol + M-star)) with redshift and found a similar, steeply increasing trend for both samples. At z similar to 4, this fraction reaches similar to 60%. The average position of the main-sequence galaxies is on the locus of the local, normal star-forming disks in the integrated Schmidt-Kennicutt diagram (star formation rate versus mass of molecular gas), suggesting that the bulk of the star formation up to z = 4 is dominated by secular processes.

引用

页数：17

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