The ALMA Redshift 4 Survey (AR4S) I. The massive end of the z=4 main sequence of galaxies

被引：47

作者：

Schreiber, C. ^{[1
,2
]}

Pannella, M. ^{[2
,3
]}

Leiton, R. ^{[4
,5
]}

Elbaz, D. ^{[2
]}

Wang, T. ^{[2
,6
]}

Okumura, K. ^{[2
]}

Labbe, I. ^{[1
]}

机构：

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

[2] Univ Paris Diderot, CEA Saclay, CNRS, Lab AIM Paris Saclay,CEA DSM Irfu, Pt Courrier 131, F-91191 Gif Sur Yvette, France

[3] Ludwig Maximilians Univ Munchen, Fac Phys, Scheinerstr 1, D-81679 Munich, Germany

[4] Univ Valparaiso, Inst Fis & Astron, Avda Gran Bretana 1111, Valparaiso 2360102, Chile

[5] Univ Concepcion, Astron Dept, Cssilla 160-C, Concepcion, Chile

[6] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 599卷

关键词：

galaxies: evolution; galaxies: statistics; galaxies: star formation; submillimeter: galaxies; STAR-FORMATION;

D O I：

10.1051/0004-6361/201629155

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We introduce the ALMA Redshift 4 Survey (AR4S), a systematic ALMA survey of all the known galaxies with stellar mass (M-*) larger than 5 x 10(10) M-circle dot at 3.5 < z < 4.7 in the GOODS-south, UDS and COSMOS CANDELS fields. The sample we have analyzed in this paper is composed of 96 galaxies observed with ALMA at 890 mu m (180 mu m rest-frame) with an on-source integration time of 1.3 min per galaxy. We detected 32% of the sample at more than 3 sigma significance. Using the stacked ALMA and Herschel photometry, we derived an average dust temperature of 40 +/- 2K for the whole sample, and extrapolate the L-IR and SFR for all our galaxies based on their ALMA flux. We then used a forward modeling approach to estimate their intrinsic sSFR distribution, deconvolved of measurement errors and selection effects: we find a linear relation between SFR and M-circle dot, with a median sSFR = 2.8 +/- 0.8 Gyr and a dispersion around that relation of 0.28 +/- 0.13 dex. This latter value is consistent with that measured at lower redshifts, which is proof that the main sequence of star-forming galaxies was already in place at z = 4, at least among massive galaxies. These new constraints on the properties of the main sequence are in good agreement with the latest predictions from numerical simulations, and suggest that the bulk of star formation in galaxies is driven by the same mechanism from z = 4 to the present day, that is, over at least 90% of the cosmic history. We also discuss the consequences of our results on the population of early quiescent galaxies. This paper is part of a series that will employ these new ALMA observations to explore the star formation and dust properties of the massive end of the z = 4 galaxy population.

引用

页数：7

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