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-Gesellschaft
A. L. R. Danielson
Durham University
H. Dannerbauer
Universität Wien
T. R. Greve
University College London (UCL)
J. A. Hodge
Max-Planck-Gesellschaft
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-Gesellschaft
A. P. Thomson
Durham University
F. Walter
Max-Planck-Gesellschaft
J. L. Wardlow
University of California at Irvine (UCI)
Niels Bohr Institute
A. Weiss
Max-Planck-Gesellschaft
P.P. van der Werf
Universiteit Leiden
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 788 2 125Ämneskategorier
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
DOI
10.1088/0004-637x/788/2/125