Aretxaga, Itziar and Hughes, David H. and Coppin, Kristen and Mortier, Angela M. J. and Wagg, Jeff and Dunlop, James S. and Chapin, Edward L. and Eales, Stephen A. and Gaztañaga, Enrique and Halpern, Mark and Ivison, Rob J. and van Kampen, Eelco and Scott, Douglas and Serjeant, Stephen and Smail, Ian and Babbedge, Thomas and Benson, Andrew J. and Chapman, Scott and Clements, David L. and Dunne, Loretta and Dye, Simon and Farrah, Duncan and Jarvis, Matt J. and Mann, Robert G. and Pope, Alexandra and Priddey, Robert and Rawlings, Steve and Seigar, Marc and Silva, Laura and Simpson, Chris and Vaccari, Mattia (2007) The SCUBA half degree extragalactic survey – IV. Radio–mm–FIR photometric redshifts. Monthly Notices of the Royal Astronomical Society, 379 (4). pp. 1571-1588. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20090410-112320222
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We present the redshift distribution of the Submillimetre Common-User Bolometer Array (SCUBA) Half Degree Survey (SHADES) galaxy population based on the rest-frame radio–mm–far-infrared (FIR) colours of 120 robustly detected 850 μm sources in the Lockman Hole East (LH) and Subaru XMM–Newton Deep Field (SXDF). The redshift distribution derived from the full spectral energy distribution (SED) information is shown to be narrower than that determined from the radio–sub-mm spectral index, as more photometric bands contribute to a higher redshift accuracy. The redshift distribution of sources derived from at least two photometric bands peaks at z≈ 2.4 and has a near-Gaussian distribution, with 50 per cent (interquartile range) of sources at z= 1.8–3.1 . We find a statistically significant difference between the measured redshift distributions in the two fields; the SXDF peaking at a slightly lower redshift (median z ≈ 2.2 ) than the LH (median z ≈ 2.7 ), which we attribute to the noise properties of the radio observations. We demonstrate, however, that there could also be field-to-field variations that are consistent with the measured differences in the redshift distributions and, hence, that the incomplete area observed by SHADES with SCUBA, despite being the largest sub-mm survey to date, may still be too small to fully characterize the bright sub-mm galaxy population. Finally, we present a brief comparison with the predicted, or assumed, redshift distributions of sub-mm galaxy formation and evolution models, and we derive the contribution of these SHADES sources and the general sub-mm galaxy population to the star formation rate density at different epochs.
|Additional Information:||© 2007 Royal Astronomical Society. Accepted 2007 May 27; received 2007 May 11; in original form 2007 February 19. IA and DHH acknowledge partial support from Conacyt grants 39548-F and 39953-F and a Royal Society – Academia Mexicana de Ciencias 2005 exchange program. This work has also been partially funded by PPARC. KC acknowledges additional partial support from NSERC, IRS from the Royal Society, AJB from the Gordon and Betty Moore Foundation, MS from a Gary McCue Fellowship through the Center of Cosmology at UC Irvine and CS from a PPARC Advanced Fellowship.|
|Subject Keywords:||surveys; galaxies: evolution; cosmology: miscellaneous; infrared: galaxies; submillimetre|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||29 Apr 2009 21:53|
|Last Modified:||26 Dec 2012 10:56|
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