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29 March 2024
 
  » arxiv » 1007.5260

 Article overview


Herschel-ATLAS: counterparts from the UV--NIR in the science demonstration phase catalogue
D. J. B. Smith ; L. Dunne ; S. J. Maddox ; S. Eales ; D. G. Bonfield ; M. J. Jarvis ; W. Sutherland ; S. Fleuren ; E. E. Rigby ; M. A. Thompson ; I. K. Baldry ; S. Bamford ; S. Buttiglione ; A. Cava ; D. Clements ; A Cooray ; S. Croom ; A. Dariush ; G. de Zotti ; S. P. Driver ; J. S. Dunlop ; J. Fritz ; D. T. Hill ; A. Hopkins ; R. Hopwood ; E. Ibar ; R. J. Ivison ; D. H. Jones ; L. Kelvin ; L. Leeuw ; J. Liske ; J. Loveday ; B. F. Madore ; P. Norberg ; P. Panuzzo ; E. Pascale ; M. Pohlen ; C. C. Popescu ; M. Prescott ; A. Robotham ; G. Rodighiero ; D. Scott ; M. Seibert ; R. Sharp ; P. Temi ; R. J. Tuffs ; P. van der Werf ; E. van Kampen ;
Date 29 Jul 2010
AbstractWe discuss the application of a likelihood ratio technique to a new data-set comprising 6621 sources selected at 250um from the Herschel-Astrophysical Terahertz Large Area Survey science demonstration observations. We show that this likelihood ratio technique can effectively identify the optical/near-infrared counterparts to these objects. We identify 2423 counterparts to these sources with reliability R >= 0.8, and briefly discuss our method for determining photometric redshifts. We show that 59.3 percent of the 250um-selected galaxies have counterparts in our catalogue down to an r-band magnitude limit of 22.4 mag in data from the Sloan Digital Sky Survey seventh data release, and we confidently identify 61.8 percent of these (approximately 36.6 percent of the >5 sigma 250um sources). We derive the counterpart identification completeness as a function of redshift, and show that 250um-selected Herschel-ATLAS sources have a peak in their redshift distribution which is lower than that of SDSS DR7 galaxies. Combined with an analysis of their sub-mm photometric redshift distribution, this suggests a bimodal n(z) for 250um selected sources at S(250um) > 32 mJy. We also suggest a new method for efficiently selecting populations of strongly-lensed galaxies residing at high redshifts. Our identifications are matched to UV-NIR photometry and spectroscopic redshifts from the GAMA survey, and these data are available as part of the Herschel-ATLAS public data release.
Source arXiv, 1007.5260
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