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The Australia Telescope 20-GHz (AT20G) Survey: the Bright Source Sample |
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| Authors: | Marcella Massardi Ronald D Ekers Tara Murphy Roberto Ricci Elaine M Sadler Sarah Burke Gianfranco De Zotti Philip G Edwards Paul J Hancock Carole A Jackson Michael J Kesteven Elizabeth Mahony Christopher J Phillips Lister Staveley-Smith Ravi Subrahmanyan Mark A Walker Warwick E Wilson |
| Institution: | SISSA/ISAS, Via Beirut 2–4, I-34014 Trieste, Italy;Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia;School of Physics, University of Sydney, NSW 2006, Australia;School of Information Technologies, University of Sydney, NSW 2006, Australia;Department of Physics and Astronomy, University of Calgary, 2500 University Drive NW Calgary, AB, Canada;Swinburne University of Technology, PO Box 218, Hawthorn, Vic 3122, Australia;INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy;School of Physics, University of Western Australia, 35 Stirling Highway Crawley, WA 6009, Australia;Raman Research Institute, Sadashivanagar, Bangalore 560080, India;Manly Astrophysics Workshop Pty Ltd, 3/22 Cliff Street, Manly 2095, Australia |
| Abstract: | The Australia Telescope 20-GHz (AT20G) Survey is a blind survey of the whole southern sky at 20 GHz (with follow-up observations at 4.8 and 8.6 GHz) 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 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 ∝ν |
| Keywords: | surveys galaxies: active cosmic microwave background radio continuum: general |