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Recent X-ray surveys have provided a large number of high-luminosity,obscured Active Galactic Nuclei (AGN), the so-called Type 2 quasars. Despitethe large amount of multi-wavelength supporting data, the main parametersrelated to the black holes harbored in such AGN are still poorly known. Here wepresent the results obtained for a sample of eight Type 2 quasars in theredshift range 0.9-2.1 selected from the HELLAS2XMM survey, for which we usedKs-band, Spitzer IRAC and MIPS data at 24 micron to estimate bolometriccorrections, black hole masses, and Eddington ratios.

The obscured X-ray source population in the HELLAS2XMM survey: the Spitzer view