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An AzTEC 1.1 mm survey of the GOODS-N field – II. Multiwavelength identifications and redshift distribution

Chapin, Edward L. and Pope, Alexandra and Scott, Douglas and Aretxaga, Itziar and Austermann, Jason E. and Chary, Ranga-Ram and Coppin, Kristen and Halpern, Mark and Hughes, David H. and Lowenthal, James D. and Morrison, Glenn E. and Perera, Thushara A. and Scott, Kimberly S. and Wilson, Grant W. and Yun, Min S. (2009) An AzTEC 1.1 mm survey of the GOODS-N field – II. Multiwavelength identifications and redshift distribution. Monthly Notices of the Royal Astronomical Society, 398 (4). pp. 1793-1808. ISSN 0035-8711.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Pope, Alexandra0000-0001-8592-2706
Scott, Douglas0000-0002-6878-9840
Aretxaga, Itziar0000-0002-6590-3994
Chary, Ranga-Ram0000-0001-7583-0621
Halpern, Mark0000-0002-1760-0868
Wilson, Grant W.0000-0003-2705-9152
Yun, Min S.0000-0001-7095-7543
Additional Information:© 2009 RAS. Accepted 2009 June 15; received 2009 June 1; in original form 2009 March 24. We thank D. Stern, E. MacDonald and M. Dickinson for providing their unpublished Keck redshift for AzGN 27. We also thank the anonymous referees for their helpful comments. This research was supported by the Natural Sciences and Engineering Research Council of Canada, and the NSF grant AST05-40852. AP acknowledges support provided by NASA through the Spitzer Space Telescope Program, through a contract issued by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. IA and DHH acknowledge partial support by CONACyT from research grants 39953-F and 39548-F.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Consejo Nacional de Ciencia y Tecnología (CONACYT)39953-F
Consejo Nacional de Ciencia y Tecnología (CONACYT)39548-F
Subject Keywords:galaxies: formation; galaxies: high-redshift; galaxies: starburst; infrared: galaxies; submillimetre
Issue or Number:4
Record Number:CaltechAUTHORS:20091013-105802080
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16323
Deposited By: Jason Perez
Deposited On:14 Oct 2009 16:34
Last Modified:09 Mar 2020 13:18

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