The Phoenix survey: the pairing fraction of faint radio sources

doi:10.1046/j.1365-8711.1999.03141.x

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Monthly Notices of the Royal Astronomical Society

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Monthly Notices of the Royal Astronomical Society: Letters

Volume 310 Issue 1, Pages L15 - L19

Published Online: 4 Apr 2002

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The Phoenix survey: the pairing fraction of faint radio sources

A. E. Georgakakis, ^1,2 B. Mobasher, ² L. Cram ³ and A. Hopkins ⁴

¹ School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT ² Astrophysics Group, Blackett Laboratory, Imperial College, Prince Consort Rd, London SW7 2BZ ³ Astrophysics Department, School of Physics, University of Sydney, NSW, Australia 2006 ⁴ Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, PA 15260, USA

KEYWORDS

galaxies: active • galaxies: starburst • cosmology: observations • radio continuum: galaxies

ABSTRACT

The significance of tidal interactions in the evolution of the faint radio population (sub-mJy) is studied using a deep and homogeneous radio survey (1.4 GHz), covering an area of 3.14 deg² and complete to a flux density of 0.4 mJy. Optical photometric and spectroscopic data are also available for this sample. A statistical approach is employed to identify candidate physical associations between radio sources and optically selected 'field' galaxies. We find an excess of close pairs around optically identified faint radio sources, albeit at a low significance level, implying that the pairing fraction of the sub-mJy radio sources is similar to that of 'field' galaxies (at the same magnitude limit) but higher than that of local galaxies.

DIGITAL OBJECT IDENTIFIER (DOI)

10.1046/j.1365-8711.1999.03141.x About DOI