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Title:
Characterization of SCUBA-2 450 mum and 850 mum selected galaxies in the COSMOS field
Authors:
Casey, Caitlin M.; Chen, Chian-Chou; Cowie, Lennox L.; Barger, Amy J.; Capak, Peter; Ilbert, Olivier; Koss, Michael; Lee, Nicholas; Le Floc'h, Emeric; Sanders, David B.; Williams, Jonathan P.
Affiliation:
AA(Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Dr, Honolulu, HI 96822, USA; ; ), AB(Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Dr, Honolulu, HI 96822, USA), AC(Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Dr, Honolulu, HI 96822, USA), AD(Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Dr, Honolulu, HI 96822, USA; Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706, USA; Department of Physics and Astronomy, University of Hawai'i, 2505 Correa Road, Honolulu, HI 96822, USA), AE(Spitzer Science Center, California Institute of Technology, 1200 E. California Blvd, Pasadena, CA, 91125, USA), AF(Laboratoire d'Astrophysique de Marseille, 38 rue Frederic Joliot Curie, F-13388 Marseille, France), AG(Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Dr, Honolulu, HI 96822, USA), AH(Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Dr, Honolulu, HI 96822, USA), AI(CEA-Saclay, Orme des Merisiers, Bat. 709, F-91191 Gif-sur-Yvette, France), AJ(Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Dr, Honolulu, HI 96822, USA), AK(Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Dr, Honolulu, HI 96822, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 436, Issue 3, p.1919-1954 (MNRAS Homepage)
Publication Date:
12/2013
Origin:
OUP
Astronomy Keywords:
galaxies: evolution, galaxies: high-redshift, galaxies: starbursts, infrared: galaxies
Abstract Copyright:
2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stt1673
Bibliographic Code:
2013MNRAS.436.1919C

Abstract

We present deep 450 mum and 850 mum observations of a large, uniformly covered 394 arcmin2 area in the Cosmic Evolution Survey (COSMOS) field obtained with the SCUBA-2 instrument on the James Clerk Maxwell Telescope (JCMT). We achieve root-mean-square noise values of sigma450 = 4.13 mJy and sigma850 = 0.80 mJy. The differential and cumulative number counts are presented and compared to similar previous works. Individual point sources are identified at >3.6sigma significance, a threshold corresponding to a 3-5 per cent sample contamination rate. We identify 78 sources at 450 mum and 99 at 850 mum, with flux densities S450 = 13-37 mJy and S850 = 2-16 mJy. Only 62-76 per cent of 450 mum sources are 850 mum detected and 61-81 per cent of 850 mum sources are 450 mum detected. The positional uncertainties at 450 mum are small (1-2.5 arcsec) and therefore allow a precise identification of multiwavelength counterparts without reliance on detection at 24 mum or radio wavelengths; we find that only 44 per cent of 450 mum sources and 60 per cent of 850 mum sources have 24 mum or radio counterparts. 450 mum selected galaxies peak at <z> = 1.95 ± 0.19 and 850 mum selected galaxies peak at <z> = 2.16 ± 0.11. The two samples occupy similar parameter space in redshift and luminosity, while their median SED peak wavelengths differ by ˜20-50 mum (translating to DeltaTdust = 8-12 K, where 450 mum selected galaxies are warmer). The similarities of the 450 mum and 850 mum populations, yet lack of direct overlap between them, suggests that submillimetre surveys conducted at any single far-infrared wavelength will be significantly incomplete (≳30 per cent) at censusing infrared-luminous star formation at high z.
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