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Radio sources in the 2dF Galaxy Redshift Survey – II. Local radio luminosity functions for AGN and star-forming galaxies at 1.4 GHz
Authors:Elaine M Sadler  Carole A Jackson  Russell D Cannon  Vincent J McIntyre  Tara Murphy  Joss Bland-Hawthorn  Terry Bridges  Shaun Cole  Matthew Colless  Chris Collins  Warrick Couch  Gavin Dalton  Roberto De Propris  Simon P Driver  George Efstathiou  Richard S Ellis  Carlos S Frenk  Karl Glazebrook  Ofer Lahav  Ian Lewis  Stuart Lumsden  Steve Maddox  Darren Madgwick  Peder Norberg  John A Peacock  Bruce A Peterson  Will Sutherland  Keith Taylor
Institution:1School of Physics, University of Sydney, NSW 2006, Australia;2Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia;3Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia;4Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 2121, Australia;5Department of Physics, South Road, Durham DH1 3LE;6Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead L14 1LD;7Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia;8Department of Physics, Keble Road, Oxford OX1 3RH;9School of Physics and Astronomy, North Haugh, St Andrews, Fife KY6 9SS;10Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA;11Department of Astronomy, Caltech, Pasadena, CA 91125, USA;12Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686, USA;13Department of Physics, University of Leeds, Woodhouse Lane, Leeds LS2 9JT;14School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD;15Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ
Abstract:We have cross-matched the 1.4-GHz NRAO VLA Sky Survey (NVSS) with the first 210 fields observed in the 2dF Galaxy Redshift Survey (2dFGRS), covering an effective area of 325 deg2 (about 20 per cent of the final 2dFGRS area). This yields a set of optical spectra of 912 candidate NVSS counterparts, of which we identify 757 as genuine radio identifications – the largest and most homogeneous set of radio source spectra ever obtained. The 2dFGRS radio sources span the redshift range     to 0.438, and are a mixture of active galaxies (60 per cent) and star-forming galaxies (40 per cent). About 25 per cent of the 2dFGRS radio sources are spatially resolved by NVSS, and the sample includes three giant radio galaxies with projected linear size greater than 1 Mpc. The high quality of the 2dF spectra means we can usually distinguish unambiguously between AGN and star-forming galaxies. We make a new determination of the local radio luminosity function at 1.4 GHz for both active and star-forming galaxies, and derive a local star formation density of         .
Keywords:galaxies: active  galaxies: luminosity function  mass function  galaxies: starburst  radio continuum: galaxies
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