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Title:
An AzTEC 1.1mm survey of the GOODS-N field - II. Multiwavelength identifications and redshift distribution
Authors:
Chapin, Edward L.; Pope, Alexandra; Scott, Douglas; Aretxaga, Itziar; Austermann, Jason E.; Chary, Ranga-Ram; Coppin, Kristen; Halpern, Mark; Hughes, David H.; Lowenthal, James D.; Morrison, Glenn E.; Perera, Thushara A.; Scott, Kimberly S.; Wilson, Grant W.; Yun, Min S.
Affiliation:
AA(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada), AB(National Optical Astronomy Observatory, 950 N. Cherry Ave., Tucson, AZ 85719, USA), AC(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada), AD(Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), Aptdo. Postal 51 y 216, Puebla, Mexico), AE(Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA), AF(Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA), AG(Institute for Computational Cosmology, University of Durham, South Road, Durham DH1 3LE), AH(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada), AI(Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), Aptdo. Postal 51 y 216, Puebla, Mexico), AJ(Department of Astronomy, Smith College, Northampton, MA 01063, USA), AK(Institute for Astronomy, University of Hawaii, Honolulu, HI 96822, USA; Canada-France-Hawaii Telescope, Kamuela, HI 96743, USA), AL(Illinois Wesleyan University, P.O. Box 2900, Bloomington, IL 61702-2900, USA), AM(Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA), AN(Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA), AO(Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 398, Issue 4, pp. 1793-1808. (MNRAS Homepage)
Publication Date:
10/2009
Origin:
MNRAS
Astronomy Keywords:
galaxies: formation , galaxies: high-redshift , galaxies: starburst , infrared: galaxies , submillimetre
DOI:
10.1111/j.1365-2966.2009.15267.x
Bibliographic Code:
2009MNRAS.398.1793C

Abstract

We present results from a multiwavelength study of 29 sources (false detection probabilities <5 per cent) from a survey of the Great Observatories Origins Deep Survey-North (GOODS-N) field at 1.1mm using the Astronomical Thermal Emission Camera (AzTEC). Comparing with existing 850μm Submillimetre Common-User Bolometer Array (SCUBA) studies in the field, we examine differences in the source populations selected at the two wavelengths. The AzTEC observations uniformly cover the entire survey field to a 1σ depth of ~1mJy. Searching deep 1.4GHz Very Large Array (VLA) and Spitzer 3-24μm catalogues, we identify robust counterparts for 21 1.1mm sources, and tentative associations for the remaining objects. The redshift distribution of AzTEC sources is inferred from available spectroscopic and photometric redshifts. We find a median redshift of z = 2.7, somewhat higher than z = 2.0 for 850μm selected sources in the same field, and our lowest redshift identification lies at a spectroscopic redshift z = 1.1460. We measure the 850μm to 1.1mm colour of our sources and do not find evidence for `850μm dropouts', which can be explained by the low signal-to-noise ratio of the observations. We also combine these observed colours with spectroscopic redshifts to derive the range of dust temperatures T, and dust emissivity indices β for the sample, concluding that existing estimates T ~ 30K and β ~ 1.75 are consistent with these new data.
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