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A 1200-μm MAMBO survey of the GOODS-N field: a significant population of submillimetre dropout galaxies

Greve, Thomas R. and Pope, Alexandra and Scott, Douglas and Ivison, Rob J. and Borys, Colin and Conselice, Christopher J. and Bertoldi, Frank (2008) A 1200-μm MAMBO survey of the GOODS-N field: a significant population of submillimetre dropout galaxies. Monthly Notices of the Royal Astronomical Society, 389 (4). pp. 1489-1506. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:GREmnras08

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Abstract

We present a 1200-mu m image of the Great Observatories Origin Deep Survey North (GOODS-N) field, obtained with the Max Planck Millimetre Bolometer array (MAMBO) on the IRAM 30-m telescope. The survey covers a contiguous area of 287 arcmin(^2) to a near-uniform noise level of similar to 0.7mJy beam(^-1). After Bayesian flux deboosting, a total of 30 sources are recovered (>= 3.5 sigma). An optimal combination of our 1200-mu m data and an existing 850-mu m image from the Submillimetre Common-User Bolometer Array (SCUBA) yielded 33 sources (>= 4 sigma). We combine our GOODS-N sample with those obtained in the Lockman Hole and ELAIS N2 fields (Scott et al. 2002; Greve et al. 2004) in order to explore the degree of overlap between 1200-and 850-mu m-selected galaxies (hereafter SMGs), finding no significant difference between their S-850 mu m/S-1200 mu m distributions. However, a noise-weighted stacking analysis yields a significant detection of the 1200-mu m-blank SCUBA sources, S-850 mu m/S-1200 mu m = 3.8 +/- 0.4, whereas no significant 850-mu m signal is found for the 850-mu m-blank MAMBO sources (S-850 mu m/S-1200 mu m = 0.7 +/- 0.3). The hypothesis that the S-850 mu m/S-1200 mu m distribution of SCUBA sources is also representative of the MAMBO population is rejected at the similar to 4 sigma level, via Monte Carlo simulations. Therefore, although the populations overlap, galaxies selected at 850 and 1200 mu m are different, and there is compelling evidence for a significant 1200-mu m-detected population which is not recovered at 850 mu m. These are submillimetre dropouts (SDOs), with S-850 mu m/S-1200 mu m = 0.7-1.7, requiring very cold dust or unusual spectral energy distributions (T-d similar or equal to 10 K; beta similar or equal to 1), unless SDOs reside beyond the redshift range observed for radio-identified SMGs, i. e. at z > 4.


Item Type:Article
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http://dx.doi.org/10.1111/j.1365-2966.2008.13631.xDOIUNSPECIFIED
Additional Information:© 2008 The Authors. Journal compilation © 2008 RAS. Accepted 2008 June 20. Received 2008 June 19; in original form 2008 March 27. We are grateful to the IRAM staff at Pico Veleta, in particular to Stephane Leon for his assistance with the pool observing. We thank Helmut Dannerbauer and Alejo Martinez Sansigre for discussions and for useful comments on the paper. We also thank the referee for a useful, thorough and swift response. AP and DS would like to thank the Natural Sciences and Engineering Research Council of Canada. AP also acknowledges support provided by NASA through the Spitzer Space Telescope Fellowship Program, through a contract issued by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.
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Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
NASAUNSPECIFIED
Subject Keywords:surveys; galaxies: evolution; galaxies: formation; galaxies: starburst; cosmology: observations; submillimetre
Record Number:CaltechAUTHORS:GREmnras08
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:GREmnras08
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12351
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Dec 2008 17:45
Last Modified:25 Mar 2014 18:58

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