AN ALMA SURVEY OF SUBMILLIMETER GALAXIES IN THE EXTENDED CHANDRA DEEP FIELD SOUTH: SOURCE CATALOG AND MULTIPLICITY

Journal Article · Wed May 01 04:00:00 EDT 2013 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/768/1/91· OSTI ID:22126790

Hodge, J. A.; Walter, F.; Decarli, R. ^[1]; Karim, A.; Smail, I.; Swinbank, A. M.; Alexander, D. M.; Danielson, A. L. R.; Edge, A. C. ^[2]; Biggs, A. D.; De Breuck, C. ^[3]; Ivison, R. J. ^[4]; Weiss, A. ^[5]; Bertoldi, F. ^[6]; Brandt, W. N. ^[7]; Chapman, S. C. ^[8]; Coppin, K. E. K. ^[9]; Cox, P. ^[10]; Dannerbauer, H. ^[11]; others, and

---

1. Max-Planck Institute for Astronomy, Koenigstuhl 17, D-69117 Heidelberg (Germany)
2. Institute for Computational Cosmology, Durham University, South Road, Durham, DH1 3LE (United Kingdom)
3. European Southern Observatory, Karl-Schwarzschild Strasse 2, D-85748 Garching (Germany)
4. UK Astronomy Technology Center, Science and Technology Facilities Council, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ (United Kingdom)
5. Max-Planck Institut fuer Radioastronomie, Auf dem Huegel 69, D-53121 Bonn (Germany)
6. Argelander-Institute of Astronomy, Bonn University, Auf dem Huegel 71, D-53121 Bonn (Germany)
7. Department of Astronomy and Astrophysics, 525 Davey Lab, Pennsylvania State University, University Park, PA 16802 (United States)
8. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom)
9. Department of Physics, McGill University, 3600 Rue University, Montreal, QC H3A 2T8 (Canada)
10. IRAM, 300 rue de la piscine, F-38406 Saint-Martin d'Heres (France)
11. Universitaet Wien, Institut fuer Astrophysik, Tuerkenschanzstrasse 17, A-1180 Wien (Austria)

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 {approx}3 Multiplication-Sign deeper and with a beam area {approx}200 Multiplication-Sign 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 {approx}1.''6 resolution allows us to measure a size of {approx}9 kpc Multiplication-Sign 5 kpc for the rest-frame {approx}300 {mu}m emission region in one resolved SMG, implying a star formation rate surface density of 80 M{sub Sun} yr{sup -1} kpc{sup -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.

• OSTI ID: 22126790
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 768; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
DENSITY
EMISSION
FLUX DENSITY
GALAXIES
MULTIPLICITY
STARS