An AzTEC 1.1 mm survey of the GOODS-N field – II. Multiwavelength identifications and redshift distribution |
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| Authors: | Edward L Chapin Alexandra Pope † Douglas Scott Itziar Aretxaga Jason E Austermann Ranga-Ram Chary Kristen Coppin Mark Halpern David H Hughes James D Lowenthal Glenn E Morrison Thushara A Perera Kimberly S Scott Grant W Wilson Min S Yun |
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| Institution: | Department of Physics &Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada;National Optical Astronomy Observatory, 950 N. Cherry Ave., Tucson, AZ 85719, USA;Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), Aptdo. Postal 51 y 216, Puebla, Mexico;Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA;Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA;Institute for Computational Cosmology, University of Durham, South Road, Durham DH1 3LE;Department of Astronomy, Smith College, Northampton, MA 01063, USA;Institute for Astronomy, University of Hawaii, Honolulu, HI 96822, USA;Canada–France–Hawaii Telescope, Kamuela, HI 96743, USA;Illinois Wesleyan University, P.O. Box 2900, Bloomington, IL 61702-2900, USA |
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| 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 1.1 mm using the Astronomical Thermal Emission Camera (AzTEC). Comparing with existing 850 μm 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 ～1 mJy. Searching deep 1.4 GHz Very Large Array (VLA) and Spitzer 3–24 μm catalogues, we identify robust counterparts for 21 1.1 mm 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 850 μm selected sources in the same field, and our lowest redshift identification lies at a spectroscopic redshift z = 1.1460 . We measure the 850 μm to 1.1 mm colour of our sources and do not find evidence for '850 μm 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 ～ 30 K and β～ 1.75 are consistent with these new data. |
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| Keywords: | galaxies: formation galaxies: high-redshift galaxies: starburst infrared: galaxies submillimetre |
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