423 citations · 2.6k across the 46 of their papers we have counts for
45 papers · 1 filter
X-ray absorption in Compton-thin AGN: the predictions of a model revisited
A. Lamastra, G. C. Perola, G. Matt
The evidence of a decrease with increasing luminosity of the fraction f_{abs} of absorbed and Compton-thin among X-ray (2-10 keV) selected AGN is observationally rather well suppor…
Testing the cosmic ray content in galaxy clusters
P. Marchegiani, G. C. Perola, S. Colafrancesco
The effective content of cosmic rays (CR) in galaxy clusters remains elusive. This paper aims to estimate a maximum production of both secondary relativistic electrons, SRE, and ga…
The HELLAS2XMM survey.VIII. Optical identifications of the extended sample
F. Cocchia, F. Fiore, C. Vignali +14
(Abridged) We present the results of the photometric and spectroscopic identification of 110 hard X-ray selected sources (6e-15<F(2-10 keV)<4e-14 cgs) from 5 additional XMM-Newton…
A possible bias on the estimate of Lbol/Ledd in AGN as a function of luminosity and redshift
Alessandra Lamastra, Giorgio Matt, G. Cesare Perola
The BH mass (and the related Eddington ratio) in broad line AGN is usually evaluated by combining estimates (often indirect) of the BLR radius and of the FWHM of the broad lines, u…
Opening a New Window to Fundamental Physics and Astrophysics: X-ray Polarimetry
E. Costa, R. Bellazzini, P. Soffitta +25
An extensive theoretical literature predicts that X-ray Polarimetry can directly determine relevant physical and geometrical parameters of astrophysical sources, and discriminate b…
The HELLAS2XMM survey. IX. Spectroscopic identification of super-EROs hosting AGNs
R. Maiolino, M. Mignoli, L. Pozzetti +12
We present VLT near-IR spectroscopic observations of three X-ray sources characterized by extremely high X-ray-to-optical ratios (X/O>40), extremely red colors (6.3<R-K<7.4, i.e. E…