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dc.contributor.authorBourne, N.
dc.contributor.authorMaddox, S.J.
dc.contributor.authorDunne, L.
dc.contributor.authorDye, S.
dc.contributor.authorEales, S.
dc.contributor.authorHoyos, C.
dc.contributor.authorGonzález-Nuevo, J.
dc.contributor.authorSmith, Daniel
dc.contributor.authorValiante, E.
dc.contributor.authorde Zotti, G.
dc.contributor.authorIvison, Rob J.
dc.contributor.authorRowlands, K.
dc.date.accessioned2015-03-24T12:18:42Z
dc.date.available2015-03-24T12:18:42Z
dc.date.issued2014-10-21
dc.identifier.citationBourne , N , Maddox , S J , Dunne , L , Dye , S , Eales , S , Hoyos , C , González-Nuevo , J , Smith , D , Valiante , E , de Zotti , G , Ivison , R J & Rowlands , K 2014 , ' Colour matters : the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel-ATLAS ' , Monthly Notices of the Royal Astronomical Society , vol. 444 , no. 2 , pp. 1884-1892 . https://doi.org/10.1093/mnras/stu1582
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 8295303
dc.identifier.otherPURE UUID: 4116fbf7-6d48-4c51-8522-d104f5cae6a7
dc.identifier.otherBibtex: urn:ccd06237ae9ef9265b73eef6e69077e1
dc.identifier.otherORCID: /0000-0001-9708-253X/work/69424362
dc.identifier.otherScopus: 84924586522
dc.identifier.urihttp://hdl.handle.net/2299/15705
dc.descriptionDate of Acceptance: 04/08/2014
dc.description.abstractWe report an unexpected variation in the positional offset distributions between Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) submillimetre (submm) sources and their optical associations, depending on both 250-μm signal-to-noise ratio and 250/350-μm colour. We show that redder and brighter submm sources have optical associations with a broader distribution of positional offsets than would be expected if these offsets were due to random positional errors in the source extraction. The observation can be explained by two possible effects: either red submm sources trace a more clustered population than blue ones, and their positional errors are increased by confusion, or red submm sources are generally at high redshifts and are frequently associated with low-redshift lensing structures which are identified as false counterparts. We perform various analyses of the data, including the multiplicity of optical associations, the redshift and magnitude distributions in H-ATLAS in comparison to HerMES, and simulations of weak lensing, and we conclude that the effects are most likely to be explained by widespread weak lensing of Herschel-SPIRE sources by foreground structures. This has important consequences for counterpart identification and derived redshift distributions and luminosity functions of submm surveysen
dc.format.extent9
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectgravitational lensing: weak, galaxies: statistics, submillimetre: galaxies
dc.titleColour matters : the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel-ATLASen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stu1582
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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