Journal Article

The evolution of radio sources in the UKIDSS-DXS–XMM-LSS field

Kim McAlpine and Matt J. Jarvis

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 413, issue 2, pages 1054-1060
Published in print May 2011 | ISSN: 0035-8711
Published online April 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.18191.x
The evolution of radio sources in the UKIDSS-DXS–XMM-LSS field

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We investigate the cosmic evolution of low-luminosity (L1.4 GHz < 1025 W Hz−1 sr−1) radio sources in the XMM Large Scale Structure Survey (XMM-LSS) field. We match low-frequency-selected (610-MHz) radio sources in the XMM-LSS field with near-infrared K-band observations over the same field from the UKIRT Infrared Deep Sky Survey. We use both the mean V/Vmax statistic and the radio luminosity function of these matched sources to quantify the evolution of the comoving space density of the low-luminosity radio sources in our sample. Our results indicate that the low-luminosity sources evolve differently from their high-luminosity counterparts out to a redshift of z∼ 0.8. The derived luminosity function is consistent with an increase in the comoving space density of low-luminosity sources by a factor of ∼1.5 at z= 0.8. We show that the use of the Kz diagram for the radio source population, although coarser than a full photometric redshift analysis, produces consistent results with previous studies using approximately >10 band photometry. This offers a promising method for conducting similar analyses over the whole sky with future near- and mid-infrared surveys.

Keywords: galaxies: active; galaxies: luminosity function, mass function; radio continuum: galaxies

Journal Article.  5336 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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