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We investigate, for the first time at z~3, the clustering properties of 189Type 1 and 157 Type 2 X-ray active galactic nuclei (AGN) of moderate luminosity(log<Lbol> = 45.3 erg/s), with photometric or spectroscopic redshifts in therange 2.2<z<6.8. These samples are based on Chandra and XMM-Newton data inCOSMOS. We find that Type 1 and Type 2 COSMOS AGN at z=3 inhabit DMHs withtypical mass of logMh = 12.84+0.10/-0.11 and 11.73+0.39/-0.45 Msun/h,respectively. This result requires a drop in the halo masses of Type 1 and 2COSMOS AGN at z~3 compared to z<2 XMM COSMOS AGN with similar luminosities.Additionally, we infer that unobscured COSMOS AGN at z~3 reside in 10 timesmore massive halos compared to obscured COSMOS AGN, at 2.6sigma level. Thisresult extends to z~3 that found in COSMOS at z<2, and rules out the picture inwhich obscuration is purely an orientation effect. A model which assumes thatthe AGN activity is triggered by major mergers is quite successful inpredicting both the low halo mass of COSMOS AGN and the typical mass ofluminous SDSS quasars at z~3, with the latter inhabiting more massive halosrespect to moderate luminosity AGN. Alternatively we can argue, at least forType 1 COSMOS AGN, that they are possibly representative of an early phase offast (i.e. Eddington limited) BH growth induced by cosmic cold flows or diskinstabilities. Given the moderate luminosity, these new fast growing BHs havemasses of e7-8 Msun at z~3 which might evolve into e8.5-9 Msun mass BHs at z=0.Following our clustering measurements, we argue that this fast BH growth at z~3in AGN with moderate luminosity occurs in DMHs with typical mass of 6 times e12Msun/h.

Clustering properties of moderate luminosity X-ray selected Type 1 and Type 2 AGN at z~3