2k citations · 32k across the 287 of their papers we have counts for
7 papers · 1 filter
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…
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…
Physics and evolution of obscured X-ray sources: a multiwavelength approach
Marcella Brusa
Observations at high energies yield important information on the structure and nature of AGN; when coupled with deep optical and near-infrared (photometric and spectroscopic) follo…
Are QSO2 hiding among EROs?
Marcella Brusa
We present the results of a deep (80 ks) XMM-Newton survey of one of the largest sample of near-infrared selected Extremely Red Objects (R-K>5) available to date (~300 objects, Dad…
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…
The HELLAS2XMM survey: VI. X-ray absorption in the 1dfAGN sample through a spectral analysis
G. C. Perola, S. Puccetti, F. Fiore +13
The spectroscopic analysis of 117 serendipitous sources in the HELLAS2XMM 1df (1 degree field) survey is described. Of these, 106 sources, of which 86% have a spectroscopic redshif…