AN ALMA SURVEY OF SUBMILLIMETER GALAXIES IN THE EXTENDED CHANDRA DEEP FIELD SOUTH: THE REDSHIFT DISTRIBUTION AND EVOLUTION OF SUBMILLIMETER GALAXIES
Artikel i vetenskaplig tidskrift, 2014

We present the first photometric redshift distribution for a large sample of 870 mu m submillimeter galaxies (SMGs) with robust identifications based on observations with ALMA. In our analysis we consider 96 SMGs in the Extended Chandra Deep Field South, 77 of which have 4-19 band photometry. We model the SEDs for these 77 SMGs, deriving a median photometric redshift of z(phot) = 2.3 +/- 0.1. The remaining 19 SMGs have insufficient photometry to derive photometric redshifts, but a stacking analysis of Herschel observations confirms they are not spurious. Assuming that these SMGs have an absolute H-band magnitude distribution comparable to that of a complete sample of z similar to 1-2 SMGs, we demonstrate that they lie at slightly higher redshifts, raising the median redshift for SMGs to zphot = 2.5 +/- 0.2. Critically we show that the proportion of galaxies undergoing an SMG-like phase at z >= 3 is at most 35% +/- 5% of the total population. We derive a median stellar mass of M star = (8 +/- 1) x 10(10) M circle dot, although there are systematic uncertainties of up to 5 x for individual sources. Assuming that the star formation activity in SMGs has a timescale of similar to 100 Myr, we show that their descendants at z similar to 0 would have a space density and MH distribution that are in good agreement with those of local ellipticals. In addition, the inferred mass-weighted ages of the local ellipticals broadly agree with the look-back times of the SMG events. Taken together, these results are consistent with a simple model that identifies SMGs as events that form most of the stars seen in the majority of luminous elliptical galaxies at the present day.

STAR-FORMING GALAXIES

galaxies: starburst

SIMILAR-TO 2

OLD STELLAR POPULATIONS

YALE-CHILE MUSYC

galaxies: high-redshift

FAR-INFRARED PROPERTIES

X-RAY SOURCES

DEGREE EXTRAGALACTIC SURVEY

PHOTOMETRIC REDSHIFT

galaxies: evolution

1.4 GHZ SURVEY

BLACK-HOLES

Författare

J. M. Simpson

Durham University

A. M. Swinbank

Durham University

I. Smail

Durham University

D. M. Alexander

Durham University

W. N. Brandt

Pennsylvania State University

F. Bertoldi

Universität Bonn

C. De Breuck

European Southern Observatory (ESO)

S. C. Chapman

Dalhousie University

K. E. K. Coppin

University of Hertfordshire

E. da Cunha

Max Planck-institutet

A. L. R. Danielson

Durham University

H. Dannerbauer

Universität Wien

T. R. Greve

University College London (UCL)

J. A. Hodge

Max Planck-institutet

R. J. Ivison

University of Edinburgh

A. Karim

Universität Bonn

Kirsten Kraiberg Knudsen

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

B. M. Poggianti

Osservatorio Astronomico di Padova

E. Schinnerer

Max Planck-institutet

A. P. Thomson

Durham University

F. Walter

Max Planck-institutet

J. L. Wardlow

UC Irvine

Niels Bohr Institute

A. Weiss

Max Planck-institutet

P.P. van der Werf

Universiteit Leiden

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 788 2 125

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1088/0004-637x/788/2/125