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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3549
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dc.contributor.authorMassardi, Marcella-
dc.contributor.authorEkers, R.D.-
dc.contributor.authorMurphy, Tara-
dc.contributor.authorSubrahmanyan, Ravi-
dc.contributor.author+13 Co-authors-
dc.date.accessioned2008-06-10T11:03:43Z-
dc.date.available2008-06-10T11:03:43Z-
dc.date.issued2008-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2008, Vol.384, p775en
dc.identifier.issnE-ISSN: 1365-2966-
dc.identifier.issnP-ISSN: 0035-8711-
dc.identifier.urihttp://hdl.handle.net/2289/3549-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en
dc.description.abstractThe Australia Telescope 20-GHz (AT20G) Survey is a blind survey of the whole southern sky at 20GHz (with follow-up observations at 4.8 and 8.6GHz) carried out with the Australia Telescope Compact Array from 2004 to 2007. The Bright Source Sample (BSS) is a complete flux-limited subsample of the AT20G Survey catalogue comprising 320 extragalactic ) radio sources south of δ = -15° with Jy. Of these, 218 have near simultaneous observations at 8 and 5GHz. In this paper we present an analysis of radio spectral properties in total intensity and polarization, size, optical identifications and redshift distribution of the BSS sources. The analysis of the spectral behaviour shows spectral curvature in most sources with spectral steepening that increases at higher frequencies (the median spectral index α, assuming S ~ να, decreases from α8.64.8 = 0.11 between 4.8 and 8.6 GHz to α208.6 = -0.16 between 8.6 and 20 GHz), even if the sample is dominated by flat spectra sources (85 per cent of the sample has α208.6 > -0.5). The almost simultaneous spectra in total intensity and polarization allowed us a comparison of the polarized and total intensity spectra: polarized fraction slightly increases with frequency, but the shapes of the spectra have little correlation. Optical identifications provided an estimation of redshift for 186 sources with a median value of 1.20 and 0.13, respectively, for QSO and galaxies.en
dc.format.extent1373603 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherBlackwell Publishing for the RASen
dc.relation.urihttp://adsabs.harvard.edu/abs/2008MNRAS.384..775Men
dc.relation.urihttp://dx.doi.org/10.1111/j.1365-2966.2007.12751.xen
dc.relation.urihttp://arxiv.org/abs/0709.3485en
dc.rights2008 Royal Astronomical Societyen
dc.subjectsurveys , galaxies: activeen
dc.subjectcosmic microwave backgrounden
dc.subjectradio continuum: generalen
dc.titleThe Australia telescope 20 GHz (AT20G) survey: the bright source sampleen
dc.typeArticleen
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