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The Herschel-ATLAS Data Release 1 Paper II: Multi-wavelength counterparts to submillimetre sources | | N. Bourne
; L. Dunne
; S. J. Maddox
; S. Dye
; C. Furlanetto
; C. Hoyos
; D. J. B. Smith
; 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
; | | Date: |
29 Jun 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<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. | | Source: | arXiv, 1606.9254 | | Services: | Forum | Review | PDF | Favorites | |
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