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We present a catalog of 213 type-2 AGN selected from the zCOSMOS survey. Theselected sample covers a wide redshift range (0.15<z<0.92) and is deeper thanany other previous study, encompassing the luminosity range 10^{5.5} < Lsun<L[OIII] < 10^{9.1} Lsun. We explore the intrinsic properties of these AGN andthe relation to their X-ray emission (derived from the XMM-COSMOSobservations). We study their evolution by computing the [OIII]5007A lineluminosity function (LF) and we constrain the fraction of obscured AGN as afunction of luminosity and redshift. The sample was selected on the basis ofthe optical emission line ratios, after applying a cut to the signal-to-noiseratio (S/N) of the relevant lines. We used the standard diagnostic diagrams[OIII]/Hbeta versus [NII]/Halpha and ([OIII]/Hbeta versus [SII]/Halpha) toisolate AGN in the redshift range 0.15<z<0.45 and the diagnostic diagram[OIII]/Hbeta versus [OII]/Hbeta to extend the selection to higher redshift(0.5<z<0.92). Combining our sample with one drawn from SDSS, we found that thebest description of the evolution of type-2 AGN is a luminosity-dependentdensity evolution model. Moreover, using the type-1 AGN LF we were able toconstrain the fraction of type-2 AGN to the total (type-1 + type-2) AGNpopulation. We found that the type-2 fraction decreases with luminosity, inagreement with the most recent results, and shows signs of a slight increasewith redshift. However, the trend with luminosity is visible only aftercombining the SDSS+zCOSMOS samples. From the COSMOS data points alone, thetype-2 fraction seems to be quite constant with luminosity.

The [OIII] emission line luminosity function of optically selected type-2 AGN from zCOSMOS