An Alma Survey of Sub-Millimeter Galaxies in the Extended Chandra Deep Field South: Sub-Millimeter Properties of Color-Selected Galaxies
Journal article, 2014
We study the sub-millimeter properties of color-selected galaxies via a stacking analysis applied for the first time to interferometric data at sub-millimeter wavelengths. We base our study on 344 GHz ALMA continuum observations of similar to 20 ''-wide fields centered on 86 sub-millimeter sources detected in the LABOCA Extended Chandra Deep Field South (ECDFS) Sub-millimeter Survey. We select various classes of galaxies (K-selected, star-forming sBzK galaxies, extremely red objects, and distant red galaxies) according to their optical/near-infrared fluxes. We find clear, >10 sigma detections in the stacked images of all these galaxy classes. We include in our stacking analysis Herschel/SPIRE data to constrain the dust spectral energy distribution of these galaxies. We find that their dust emission is well described by a modified blackbody with T-dust approximate to 30 K and beta = 1.6 and infrared luminosities of (5-11) x 10(11) L-circle dot or implied star formation rates of 75-140 M-circle dot yr(-1). We compare our results with those of previous studies based on single-dish observations at 870 mu m and find that our flux densities are a factor 2-3 higher than previous estimates. The discrepancy is observed also after removing sources individually detected in ALESS maps. We report a similar discrepancy by repeating our analysis on 1.4 GHz observations of the whole ECDFS. Hence, we find tentative evidence that galaxies that are associated in projected and redshift space with sub-mm bright sources are brighter than the average population. Finally, we put our findings in the context of the cosmic star formation rate density as a function of redshift.
high-redshift
star formation
galaxies
Author
R. Decarli
Max Planck Society
I. Smail
Durham University
F. Walter
Max Planck Society
A. M. Swinbank
Durham University
S. C. Chapman
University of Cambridge
Dalhousie University
K. E. K. Coppin
University of Hertfordshire
P. Cox
Atacama Large Millimeter-submillimeter Array (ALMA)
Institut de Radioastronomie Millimétrique (IRAM)
H. Dannerbauer
University of Vienna
T. R. Greve
University College London (UCL)
J. A. Hodge
Max Planck Society
R. J. Ivison
University of Edinburgh
A. Karim
University of Bonn
Durham University
Kirsten Kraiberg Knudsen
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
Lukas Lindroos
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
H. W. Rix
Max Planck Society
E. Schinnerer
Max Planck Society
J. M. Simpson
Durham University
P. van der Werf
Leiden University
A. Weiss
Max Planck Society
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 780 2 115Subject Categories
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
DOI
10.1088/0004-637X/780/2/115