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Our aim is to study the large-scale structure of different types of AGN usingthe medium-deep XMM-LSS survey. We measure the two-point angular correlationfunction of ~ 5700 and 2500 X-ray point-like sources over the ~ 11 sq. deg.XMM-LSS field in the soft (0.5-2 keV) and hard (2-10 keV) bands. For theconversion from the angular to the spatial correlation function we used theLimber integral equation and the luminosity-dependent density evolution modelof the AGN X-ray luminosity function. We have found significant angularcorrelations with the power-law parameters gamma = 1.81 +/- 0.02, theta_0 =1.3" +/- 0.2" for the soft, and gamma = 2.00 +/- 0.04, theta_0 = 7.3" +/- 1.0"for the hard bands. The amplitude of the correlation function w(theta) ishigher in the hard than in the soft band for f_x < 10^-14 erg s^-1 cm^-2 andlower above this flux limit. We confirm that the clustering strength theta_0grows with the flux limit of the sample, a trend which is also present in theamplitude of the spatial correlation function, but only for the soft band. Inthe hard band, it remains almost constant with r_0 = 10h^-1$ Mpc, irrespectiveof the flux limit. Our analysis of AGN subsamples with different hardnessratios shows that the sources with a hard-spectrum are more clustered thansoft-spectrum ones. This result may be a hint that the two main types of AGNpopulate different environments. Finally, we find that our clustering resultscorrespond to an X-ray selected AGN bias factor of ~ 2.5 for the soft-bandsources (at a median z = 1.1) and ~ 3.3 for the hard-band sources (at a medianz = 1), which translates into a host dark matter halo mass of ~ 10^13 h^-1 M_oand ~ 10^13.7 h^-1 M_o for the soft and hard bands, respectively.

Angular correlation functions of X-ray point-like sources in the full exposure XMM-LSS field