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

Understand

Aims: We aim at estimating the spectral energy distributions (SEDs) and the physical parameters related to the black holes harbored in eight high X-ray-to-optical (F_X/F_R>10) obscured quasars at z>0.9 selected in the 2--10 keV band from the HELLAS2XMM survey.

• Methods: We use IRAC and MIPS 24 micron observations, along with optical and Ks-band photometry, to obtain the SEDs of the sources.
• The observed SEDs are modeled using a combination of an elliptical template and torus emission (using the phenomenological templates of Silva et al.
• 2004) for six sources associated with passive galaxies; for two point-like sources, the empirical SEDs of red quasars are adopted.