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From the same journal

By the same authors

The Herschel-ATLAS Data Release 1 Paper II: Multi-wavelength counterparts to submillimetre sources

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  • N. Bourne
  • L. Dunne
  • S. J. Maddox
  • S. Dye
  • C. Furlanetto
  • C. Hoyos
  • S. Eales
  • M. W. L. Smith
  • E. Valiante
  • M. Alpaslan
  • E. Andrae
  • I. K. Baldry
  • M. E. Cluver
  • A. Cooray
  • S. P. Driver
  • J. S. Dunlop
  • M. W. Grootes
  • R. J. Ivison
  • T. H. Jarrett
  • J. Liske
  • B. F. Madore
  • C. C. Popescu
  • A. G. Robotham
  • K. Rowlands
  • M. Seibert
  • M. A. Thompson
  • R. J. Tuffs
  • S. Viaene
  • A. H. Wright
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Original languageEnglish
Pages (from-to)1714-1734
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume462
Issue2
Early online date11 Jul 2016
DOIs
Publication statusPublished - 21 Oct 2016

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`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 $z0.5$ 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.

Notes

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2016 The Authors. The Version of Record [N. Bourne, et al., ‘The Herschel - ATLAS Data Release 1 – II. Multi-wavelength counterparts to submillimetre sources’, Monthly Notices of the Royal Astronomical Society, Vol. 462 (2): 1714-1734, first published online 11 July 2016] is available online at doi: https://doi.org/10.1093/mnras/stw1654. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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