##### AUTHOR ####
ILIAS KOULOURIDIS

##### TITLE ####
X-ray AGN clustering using photometric redshifts

##### ABSTRACT ####
A method is developed to estimate the projected cross-correlation
function, w_p(R), between AGN and galaxies using photometric redshift
information only for the galaxy population. The full Probability
Distribution Function (PDF) is used to account for the uncertainties in
the photometric redshift estimates. The method is applied to the
AEGIS, where a total of 110 X-ray AGN with spectroscopic redshifts are
cross-correlated with ~21000 galaxies with photometric redshift
estimates from the Canada France Hawaii Telescope Legacy Survey (CFHTLS).
It is shown that the recovered signal is in good agreement with the
w_p(R) estimated using spectroscopic redshifts only for both the AGN and
the galaxy population (e.g. Coil et al. 2009). Our method is advantageous
in that it requires follow-up spectroscopy for AGN only and hence,
can be applied to a number of X-ray fields with limited spectroscopic
observations and multiwavelength data that allow photometric redshifts
for the overall galaxy population to be mesaured.