236 citations · 624 across the 8 of their papers we have counts for
17 papers · 1 filter
High redshift quasars in the COSMOS survey: the space density of z>3 X-ray selected QSOs
M. Brusa, A. Comastri, R. Gilli +19
We present a new measurement of the space density of high redshift (3.0<z<4.5), X-ray selected QSOs obtained by exploiting the deep and uniform multiwavelength coverage of the COSM…
Heavy absorption and soft X-ray emission lines in the XMM-Newton spectrum of the Type 2 radio-loud quasar 3C 234
E. Piconcelli, S. Bianchi, G. Miniutti +4
We report results on a 40 ks XMM-Newton observation of the Type 2 quasar 3C 234. Optical spectropolarimetric data have demonstrated the presence of a hidden broad-line region in th…
The contribution of very massive high-redshift SWIRE galaxies to the stellar mass function
S. Berta, C. J. Lonsdale, M. Polletta +18
(Abridged) We selected high-z massive galaxies at 5.8 microns, in the SWIRE ELAIS-S1 field (1 sq. deg.). Galaxies with the 1.6 microns stellar peak redshifted into the IRAC bands (…
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…
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…
The HELLAS2XMM survey. X. The bolometric output of luminous obscured quasars: The Spitzer perspective
F. Pozzi, C. Vignali, A. Comastri +10
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) obsc…