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The 2dF Galaxy Redshift Survey: the population of nearby radio galaxies at the 1-mJy level

Magliocchetti, Manuela and Maddox, Steve J. and Jackson, Carole A. and Bland-Hawthorn, Joss and Bridges, Terry and Cannon, Russell and Cole, Shaun and Colless, Matthew and Collins, Chris and Couch, Warrick and Dalton, Gavin and De Propris, Roberto and Driver, Simon P. and Efstathiou, George and Ellis, Richard S. and Frenk, Carlos S. and Glazebrook, Karl and Lahav, Ofer and Lewis, Ian and Lumsden, Stuart and Peacock, John A. and Peterson, Bruce A. and Sutherland, Will and Taylor, Keith (2002) The 2dF Galaxy Redshift Survey: the population of nearby radio galaxies at the 1-mJy level. Monthly Notices of the Royal Astronomical Society, 333 (1). pp. 100-120. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20200521-160221140

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Abstract

We use redshift determinations and spectral analysis of galaxies in the 2dF Galaxy Redshift Survey to study the properties of local radio sources with S ≥1 mJy. 557 objects (hereafter called the spectroscopic sample) drawn from the FIRST survey, corresponding to 2.3 per cent of the total radio sample, are found in the 2dFGRS catalogue within the area 9ʰ48ᵐ ≲ RA(2000) ≲ 14ʰ32ᵐ and -2°.77 ≲ Dec.(2000) ≲ 2°.25, down to a magnitude limit b_J = 19.45. The excellent quality of 2dF spectra allows us to divide these sources into classes, according to their optical spectra. Absorption-line systems make up 63 per cent of the spectroscopic sample. These may or may not show emission lines due to AGN activity, and correspond to ‘classical’ radio galaxies belonging mainly to the FRI class. They are characterized by relatively high radio-to-optical ratios, red colours, and high radio luminosities (10²¹ ≲ P_(1.4 GHz)/W Hz⁻¹ sr⁻¹ ≲ 10²⁴). Actively star-forming galaxies contribute about 32 per cent of the sample. These objects are mainly found at low redshifts (z ≲ 0.1) and show low radio-to-optical ratios, blue colours and low radio luminosities. We also found 18 Seyfert 2 galaxies (3 per cent) and four Seyfert 1s (1 per cent). Analysis of the local radio luminosity function (LF) shows that radio galaxies are well described by models that assume pure luminosity evolution, at least down to radio powers P_(1.4 GHz) ≲ 10^(20.5) W Hz⁻¹ sr⁻¹. Late-type galaxies, whose relative contribution to the radio LF is found to be lower than was predicted by previous works, present an LF which is comparable with the IRAS galaxy LF. This class of sources therefore plausibly constitutes the radio counterpart of the dusty spirals and starbursts that dominate the counts at 60 μm.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1046/j.1365-8711.2002.05386.xDOIArticle
https://ui.adsabs.harvard.edu/abs/2002MNRAS.333..100M/abstractADSArticle
https://arxiv.org/abs/astro-ph/0106430arXivDiscussion Paper
ORCID:
AuthorORCID
Bland-Hawthorn, Joss0000-0001-7516-4016
Colless, Matthew0000-0001-9552-8075
Ellis, Richard S.0000-0001-7782-7071
Additional Information:© 2002 RAS. Accepted 2001 January 31. Received 2002 January 15; in original form 2001 July 3.
Subject Keywords:galaxies: active, galaxies: starburst, cosmology: observations, radio continuum: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20200521-160221140
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200521-160221140
Official Citation:Manuela Magliocchetti, Steve J. Maddox, Carole A. Jackson, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, 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, John A. Peacock, Bruce A. Peterson, Will Sutherland, Keith Taylor, The 2dF Galaxy Redshift Survey: the population of nearby radio galaxies at the 1-mJy level, Monthly Notices of the Royal Astronomical Society, Volume 333, Issue 1, June 2002, Pages 100–120, https://doi.org/10.1046/j.1365-8711.2002.05386.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103388
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:22 May 2020 17:05
Last Modified:22 May 2020 17:20

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