An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: Source Catalog and Multiplicity
Journal article, 2013

We present an Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 0 survey of 126 submillimeter sources from the LABOCA ECDFS Submillimeter Survey (LESS). Our 870 mu m survey with ALMA (ALESS) has produced maps similar to 3x deeper and with a beam area similar to 200x smaller than the original LESS observations, doubling the current number of interferometrically-observed submillimeter sources. The high resolution of these maps allows us to resolve sources that were previously blended and accurately identify the origin of the submillimeter emission. We discuss the creation of the ALESS submillimeter galaxy (SMG) catalog, including the main sample of 99 SMGs and a supplementary sample of 32 SMGs. We find that at least 35% (possibly up to 50%) of the detected LABOCA sources have been resolved into multiple SMGs, and that the average number of SMGs per LESS source increases with LESS flux density. Using the (now precisely known) SMG positions, we empirically test the theoretical expectation for the uncertainty in the single-dish source positions. We also compare our catalog to the previously predicted radio/mid-infrared counterparts, finding that 45% of the ALESS SMGs were missed by this method. Our similar to 1 ''.6 resolution allows us to measure a size of similar to 9 kpc x 5 kpc for the rest-frame similar to 300 mu m emission region in one resolved SMG, implying a star formation rate surface density of 80 M-circle dot yr(-1) kpc(-2), and we constrain the emission regions in the remaining SMGs to be <10 kpc. As the first statistically reliable survey of SMGs, this will provide the basis for an unbiased multiwavelength study of SMG properties.


submillimeter: galaxies


star-forming galaxies

degree extragalactic survey

major mergers


cosmos field

number counts


1.4 ghz survey

galaxies: starburst

molecular gas

laboca survey

galaxies: high-redshift


J. A. Hodge

Max Planck Society

A. Karim

Durham University

I. Smail

Durham University

A. M. Swinbank

Durham University

F. Walter

Max Planck Society

A. D. Biggs

European Southern Observatory (ESO)

R. J. Ivison

Royal Observatory

University of Edinburgh

A. Weiss

Max Planck Society

D. M. Alexander

Durham University

F. Bertoldi

University of Bonn

W. N. Brandt

Pennsylvania State University

S. C. Chapman

University of Cambridge

Dalhousie University

K. E. K. Coppin

McGill University

P. Cox

Institut de RadioAstronomie Millimetrique (IRAM)

A. L. R. Danielson

Durham University

H. Dannerbauer

University of Vienna

C. De Breuck

European Southern Observatory (ESO)

R. Decarli

Max Planck Society

A. C. Edge

Durham University

T. R. Greve

University College London (UCL)

Kirsten Kraiberg Knudsen

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

K. M. Menten

Max Planck Society

H. W. Rix

Max Planck Society

E. Schinnerer

Max Planck Society

J. M. Simpson

Durham University

J. L. Wardlow

University of California at Irvine (UCI)

P. van der Werf

Leiden University

Astrophysical Journal

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

Vol. 768 1 91

Subject Categories

Astronomy, Astrophysics and Cosmology


Basic sciences



More information

Latest update