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 for X-ray detected AGN in the
SXDS and GWS fields. The limiting fluxes of our samples are 9.0
×10<SUP>-15</SUP> and 4.8 ×10<SUP>-16</SUP> erg
cm<SUP>-2</SUP> s<SUP>-1</SUP> 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&leq;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.