An Alma Survey of Sub-Millimeter Galaxies in the Extended Chandra Deep Field South: Sub-Millimeter Properties of Color-Selected Galaxies
Artikel i vetenskaplig tidskrift, 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.



star formation


R. Decarli

Max Planck-institutet

I. Smail

University of Durham

F. Walter

Max Planck-institutet

A. M. Swinbank

University of Durham

S. C. Chapman

University of Cambridge Institute of Astronomy

Dalhousie University

K. E. K. Coppin

University of Hertfordshire

P. Cox

Institut de RadioAstronomie Millimetrique (IRAM)

Atacama Large Millimeter-submillimeter Array

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

University of Durham

Kirsten Kraiberg Knudsen

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

Lukas Lindroos

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

H. W. Rix

Max Planck-institutet

E. Schinnerer

Max Planck-institutet

J. M. Simpson

University of Durham

P. van der Werf

Universiteit Leiden

A. Weiss

Max Planck-institutet

Astrophysical Journal

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

Vol. 780 115


Astronomi, astrofysik och kosmologi


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