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2011MNRAS.416.1900R - Mon. Not. R. Astron. Soc., 416, 1900-1915 (2011/September-3)
The luminosity-dependent high-redshift turnover in the steep spectrum radio luminosity function: clear evidence for downsizing in the radio-AGN population.
RIGBY E.E., BEST P.N., BROOKES M.H., PEACOCK J.A., DUNLOP J.S., ROTTGERING H.J.A., WALL J.V. and KER L.
Abstract (from CDS):
The modelling reveals clear declines, at >3σ significance, in comoving density at z > 0.7 for lower luminosity sources (log P = 25–26); these turnovers are still present at log P > 27, but move to z ≳ 3, suggesting a luminosity-dependent evolution of the redshift turnover, similar to the `cosmic downsizing' seen for other active galactic nucleus populations. These results are shown to be robust to the estimated redshift errors and to increases in the spectral index for the highest redshift sources.
Analytic fits to the best-fitting steep spectrum grid are provided so that the results presented here can be easily accessed by the reader, as well as allowing plausible extrapolations outside of the regions covered by the input data sets.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: high-redshift - galaxies: luminosity function, mass function
VizieR on-line data: <Available at CDS (J/MNRAS/416/1900): censors.dat hercules.dat wp85.dat psr.dat>
Simbad objects: 361
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