dc.contributor.author McAlpine, Kim dc.contributor.author Smith, Daniel dc.contributor.author Jarvis, M.J. dc.contributor.author bonfield, David dc.contributor.author Fleuren, Simone dc.date.accessioned 2013-04-18T12:19:33Z dc.date.available 2013-04-18T12:19:33Z dc.date.issued 2012 dc.identifier.citation McAlpine , K , Smith , D , Jarvis , M J , bonfield , D & Fleuren , S 2012 , ' The likelihood ratio as a tool for radio continuum surveys with Square Kilometre Array precursor telescopes ' , Monthly Notices of the Royal Astronomical Society , vol. 423 , no. 1 , pp. 132-140 . https://doi.org/10.1111/j.1365-2966.2012.20715.x dc.identifier.issn 0035-8711 dc.identifier.other PURE: 696164 dc.identifier.other PURE UUID: 7a2e638c-7ada-42b5-8931-996031f8e981 dc.identifier.other ArXiv: http://arxiv.org/abs/1202.1958v1 dc.identifier.other Scopus: 85027949995 dc.identifier.uri http://hdl.handle.net/2299/10469 dc.description.abstract In this paper we investigate the performance of the likelihood ratio method as a tool for identifying optical and infrared counterparts to proposed radio continuum surveys with SKA precursor and pathfinder telescopes. We present a comparison of the infrared counterparts identified by the likelihood ratio in the VISTA Deep Extragalactic Observations (VIDEO) survey to radio observations with 6, 10 and 15 arcsec resolution. We cross-match a deep radio catalogue consisting of radio sources with peak flux density $>$ 60 $\mu$Jy with deep near-infrared data limited to $K_{\mathrm{s}}\lesssim$ 22.6. Comparing the infrared counterparts from this procedure to those obtained when cross-matching a set of simulated lower resolution radio catalogues indicates that degrading the resolution from 6 arcsec to 10 and 15 arcsec decreases the completeness of the cross-matched catalogue by approximately 3 and 7 percent respectively. When matching against shallower infrared data, comparable to that achieved by the VISTA Hemisphere Survey, the fraction of radio sources with reliably identified counterparts drops from $\sim$89%, at $K_{\mathrm{s}}\lesssim$22.6, to 47% with $K_{\mathrm{s}}\lesssim$20.0. Decreasing the resolution at this shallower infrared limit does not result in any further decrease in the completeness produced by the likelihood ratio matching procedure. However, we note that radio continuum surveys with the MeerKAT and eventually the SKA, will require long baselines in order to ensure that the resulting maps are not limited by instrumental confusion noise en dc.language.iso eng dc.relation.ispartof Monthly Notices of the Royal Astronomical Society dc.rights /dk/atira/pure/core/openaccesspermission/open dc.subject astro-ph.IM dc.subject astro-ph.CO dc.title The likelihood ratio as a tool for radio continuum surveys with Square Kilometre Array precursor telescopes en dc.contributor.institution School of Physics, Astronomy and Mathematics dc.contributor.institution Science & Technology Research Institute dc.contributor.institution Centre for Astrophysics Research dc.description.status Peer reviewed dc.identifier.url http://www.scopus.com/inward/record.url?scp=84861699121&partnerID=8YFLogxK dc.relation.school School of Physics, Astronomy and Mathematics dc.description.versiontype Final Accepted Version rioxxterms.version VoR rioxxterms.version AM rioxxterms.versionofrecord https://doi.org/10.1111/j.1365-2966.2012.20715.x rioxxterms.type Journal Article/Review herts.preservation.rarelyaccessed true herts.rights.accesstype openAccess
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