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The HELLAS2XMM survey: XI. Unveiling the nature of X-ray Bright Optically Normal Galaxies
F. Civano, M. Mignoli, A. Comastri +8
X-ray Bright Optically Normal Galaxies (XBONGs) constitute a small but not negligible fraction of hard X-ray selected sources in recent Chandra and XMM-Newton surveys. Even though…
The XMM-Newton view of IRAS 09104+4109: evidence for a changing-look Type 2 quasar?
E. Piconcelli, F. Fiore, F. Nicastro +4
We analyzed the spectroscopic data from the PN and the MOS cameras in the 0.4-10 keV band. We also used an archival BeppoSAX 1-50 keV observation of IRAS 09104+4109 to investigate…
AGN counts at 15um. XMM observations of the ELAIS-S1-5 sample
F. La Franca, S. Puccetti, N. Sacchi +7
Context: The counts of galaxies and AGN in the mid infra-red (MIR) bands are important instruments for studying their cosmological evolution. However, the classic spectral line rat…
Unveiling obscured accretion in the Chandra Deep Field South
F. Fiore, A. Grazian, P. Santini +10
A large population of heavily obscured, Compton Thick AGNs is predicted by models of galaxy formation, models of Cosmic X-ray Background and by the ``relic'' super-massive black-ho…
An X-ray Survey in SA 57 with XMM-Newton
D. Trevese, F. Vagnetti, S. Puccetti +3
The maximum number density of Active Galactic Nuclei (AGNs), as deduced from X-ray studies, occurs at z<~1, with lower luminosity objects peaking at smaller redshifts. Optical stud…
Blazar surveys with WMAP and Swift
P. Giommi, M. Capalbi, E. Cavazzuti +7
We present the preliminary results from two new surveys of blazars that have direct implications on the GLAST detection of extragalactic sources from two different perspectives: mi…