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

Abstract

We investigate the cosmic evolution of low luminosity ($L_{1.4GHz}<10^{25}\mathrm{W}\mathrm{H}{\mathrm{z}}^{-1}\mathrm{s}{\mathrm{r}}^{-1}$) radio sources in the XMM Large Scale Structure survey field (XMM-LSS). 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 $V/V_{\max }$ statistic and the radio luminosity function of these matched sources to quantify the evolution of the co-moving space density of the low luminosity radio sources in our sample. Our results indicate that the low luminosity sources evolve differently to their high luminosity counterparts out to a redshift of z$\sim$0.8. The derived luminosity function is consistent with an increase in the co-moving space density of low luminosity sources by a factor of $\sim$1.5 at z=0.8. We show that the use of the $K-z$ diagram for the radio source population, although coarser than a full photometric redshift analysis, produces consistent results with previous studies using $\sim >10$ band photometry. This offers a promising method for conducting similar analyses over the whole sky with future near- and mid-infrared surveys.

8 pages, 5 figures, 2 tables, accepted for publication in MNRAS

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• The UKIRT Infrared Deep Sky Survey (UKIDSS)
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• AGN-controlled cooling in elliptical galaxies
• The X-ray nuclei of intermediate-redshift radio sources
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• The prevalence of AGN feedback in massive galaxies at z~1
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• The XXL Survey XVIII. ATCA 2.1 GHz radio source catalogue and source counts for the XXL-South field
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• Cosmological growth and feedback from supermassive black holes
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