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Obscured accreting black holes at high redshift
A. Comastri, F. Fiore, C. Vignali +2
A significant fraction of the accreting black holes powering high redshift AGN are obscured by large columns of dust and gas. For this reason, luminous type 2 quasars can be effici…
Anisotropic inverse Compton emission in the radio galaxy 3C 265
M. Bondi, G. Brunetti, A. Comastri +1
We present the results from a Chandra observation of the powerful radio galaxy 3C 265. We detect X-ray emission from the nucleus, the radio hotspots and lobes. In particular, the l…
XMM-Newton observations of Extremely Red Objects and the link with luminous, X-ray obscured Quasars
M. Brusa, A. Comastri, E. Daddi +8
We present the results of a deep (about 80 ks) XMM-Newton survey of the largest sample of near-infrared selected Extremely Red Objects (R-K>5) available to date to K_S< 19.2. At th…
HEXIT-SAT: a mission concept for X-ray grazing incidence telescopes from 0.5 to 70 keV
F. Fiore, G. C. Perola, G. Pareschi +3
While the energy density of the Cosmic X-ray Background (CXB) provides a statistical estimate of the super massive black hole (SMBH) growth and mass density in the Universe, the la…
Evidence for X-ray Obscuration in Type II Quasar Candidates from the Sloan Digital Sky Survey
C. Vignali, D. M. Alexander, A. Comastri
Recently, Zakamska et al. (2003) selected 291 high-ionization narrow emission-line AGN in the redshift range 0.3-0.83 from the Sloan Digital Sky Survey spectroscopic data. The samp…
A broad iron K alpha line at z=1.146
Andrea Comastri, Marcella Brusa, Francesca Civano
We report the discovery of a strong iron K alpha line in the hard X-ray selected source CXOJ 123716.7+621733 in the Chandra Deep Field North survey at z=1.146. The analysis is made…