X-ray luminosity functions of different morphological and X-ray type AGN populations
Luminosity functions are one of the most important observational clues
when studying galaxy evolution over cosmic time. In this paper we
present the X-ray luminosity functions of X-ray detected AGN in the SXDS
and GWS fields. The limiting fluxes of our samples are 9.0×10^(-15) and
4.8×10^(-16) erg/cm^2/sec^(-1) in the 0.5 – 7.0 keV band in the two
fields, respectively. We carried out analysis in three X-ray bands and
in two redshift intervals up to z < 1.4. Moreover, we derive the
luminosity functions for different optical morphologies and X-ray types.
We confirm strong luminosity evolution in all three bands, finding the
most luminous objects at higher redshift. However, no signs of density
evolution are found in any tested X-ray band. We obtain similar results
for compact and early-type objects. Finally, we observe the `Steffen
effect’, where X-ray type-1 sources are more numerous at higher
luminosities in comparison with type-2 sources.