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Aims: We aim at estimating the spectral energy distributions (SEDs) and thephysical parameters related to the black holes harbored in eight highX-ray-to-optical (F_X/F_R>10) obscured quasars at z>0.9 selected in the 2--10keV band from the HELLAS2XMM survey.  Methods: We use IRAC and MIPS 24 micron observations, along with optical andKs-band photometry, to obtain the SEDs of the sources. The observed SEDs aremodeled using a combination of an elliptical template and torus emission (usingthe phenomenological templates of Silva et al. 2004) for six sources associatedwith passive galaxies; for two point-like sources, the empirical SEDs of redquasars are adopted. The bolometric luminosities and the M_BH-L_K relation areused to provide an estimate of the masses and Eddington ratios of the blackholes residing in these AGN.  Results: All of our sources are detected in the IRAC and MIPS (at 24 micron)bands. The SED modeling described above is in good agreement with the observednear- and mid-infrared data. The derived bolometric luminosities are in therange ~10^45-10^47 erg s^-1, and the median 2--10 keV bolometric correction is~25, consistent with the widely adopted value derived by Elvis et al. (1994).For the objects with elliptical-like profiles in the K_s band, we derive highstellar masses (0.8-6.2)X10^11 Mo, black hole masses in the range(0.2-2.5)X10^9 Mo, and Eddington ratios L/L_Edd<0.1, suggesting a low-accretionphase.

The HELLAS2XMM survey. X. The bolometric output of luminous obscured quasars: The Spitzer perspective