2011MNRAS.413.1054M -
Mon. Not. R. Astron. Soc., 413, 1054-1060 (2011/May-2)
The evolution of radio sources in the UKIDSS-DXS–XMM-LSS field.
McALPINE K. and JARVIS M.J.
Abstract (from CDS):
We investigate the cosmic evolution of low-luminosity (L_1.4 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 K-z 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.
Abstract Copyright:
2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s):
galaxies: active - galaxies: luminosity function, mass function - radio continuum: galaxies
Simbad objects:
1
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