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Bourne, N, Dunne, L, Maddox, SJ, Dye, S, Furlanetto, C, Hoyos, C, Smith, DJB, Eales, S, Smith, MWL, Valiante, E, Alpaslan, M, Andrae, E, Baldry, IK, Cluver, ME, Cooray, A, Driver, SP, Dunlop, JS, Grootes, MW, Ivison, RJ, Jarrett, TH , Liske, J, Madore, BF, Popescu, CC, Robotham, AG, Rowlands, K, Seibert, M, Thompson, MA, Tuffs, RJ, Viaene, S and Wright, AH (2016) The Herschel-ATLAS Data Release 1 Paper II: Multi-wavelength counterparts to submillimetre sources. Monthly Notices of the Royal Astronomical Society. ISSN 0035-8711
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Abstract
This paper is the second in a pair of articles 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$\mu$m covering a total area of 600deg$^2$. In this paper we describe the identification of optical counterparts to submillimetre sources in DR1, comprising an area of 161 deg$^2$ over three equatorial fields of roughly 12$^\circ$x4.5$^\circ$ centred at 9$^h$, 12$^h$ and 14.5$^h$ 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 SDSS counterparts at r<22.4 for 250-$\mu$m-selected sources detected at $\geq$ 4$\sigma$ ($\approx$28mJy). We find `reliable' counterparts (reliability R$\geq$0.8) for 44,835 sources (39 per cent), with an estimated completeness of 73.0 per cent and contamination rate of 4.7 per cent. Using redshifts and multi-wavelength photometry from GAMA and other public catalogues, we show that H-ATLAS-selected galaxies at $z<0.5$ span a wide range of optical colours, total infrared (IR) luminosities, and IR/UV ratios, with no strong disposition towards mid-IR-classified AGN in comparison with optical selection. The data described herein, together with all maps and catalogues described in the companion paper (Valiante et al. 2016), are available from the H-ATLAS website at www.h-atlas.org.
| Item Type: | Article |
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| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2016 The authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Uncontrolled Keywords: | astro-ph.GA; astro-ph.GA; astro-ph.CO; astro-ph.SR |
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press |
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| Date Deposited: | 18 Jul 2016 09:15 |
| Last Modified: | 04 Sep 2021 12:42 |
| DOI or ID number: | 10.1093/mnras/stw1654 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/3894 |
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