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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 2(462), p. 1714-1734

DOI: 10.1093/mnras/stw1654

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TheHerschel-ATLAS Data Release 1 – II. Multi-wavelength counterparts to submillimetre sources

Journal article published in 2016 by N. Bourne, L. Dunne, S. J. Maddox, S. Dye, C. Furlanetto ORCID, C. Hoyos, D. J. B. Smith ORCID, S. Eales, M. W. L. Smith, E. Valiante, M. Alpaslan, E. Andrae, I. K. Baldry, M. E. Cluver, A. Cooray and other authors.
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Abstract

This paper is the second in a pair of papers presenting data release 1 (DR1) of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS), the largest single open-time key project carried out with the Herschel Space Observatory. The H-ATLAS is a wide-area imaging survey carried out in five photometric bands at 100, 160, 250, 350 and 500 μm covering a total area of 600 deg2. In this paper, we describe the identification of optical counterparts to submillimetre sources in DR1, comprising an area of 161 deg2 over three equatorial fields of roughly 12 × 4.5 deg centred at 9h, 12h and 14{^h.}5, respectively. Of all the H-ATLAS fields, the equatorial regions benefit from the greatest overlap with current multi-wavelength surveys spanning ultraviolet (UV) to mid-infrared regimes, as well as extensive spectroscopic coverage. We use a likelihood ratio technique to identify Sloan Digital Sky Survey counterparts at r