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The hard X-ray spectrum of Compton-thick Seyfert 2 galaxies and the synthesis of the XRB
Giorgio Matt, Fulvio Pompilio, Fabio La Franca
A synthesis model for the cosmic X-ray Background (XRB) is presented, which includes a proper treatment of Compton scattering in the absorbing matter for type 2 AGN. Evidence for a…
The X-ray background and the evolution of AGN
Fulvio Pompilio, Fabio La Franca, Giorgio Matt
We discuss the constraints on the AGN evolution from the cosmic X-ray background and source counts. A synthesis model to fit the X-ray background is presented. In the model, the sp…
BeppoSAX unveils the nuclear component in NGC 6240
P. Vignati, S. Molendi, G. Matt +10
The direct nuclear X-ray emission of the ultraluminous IRAS galaxy NGC 6240 has been observed for the first time by BeppoSAX. It is seen through an absorber with N_H=2*10^{24} cm^{…
X-ray spectra transmitted through Compton-thick absorbers
Giorgio Matt, Fulvio Pompilio, Fabio La Franca
X-ray spectra transmitted through matter which is optically thick to Compton scattering are computed by means of Monte Carlo simulations. Applications to the BeppoSAX data of the S…
The contribution of faint AGN to the hard X-ray background
F. Fiore, F. La Franca, P. Giommi +5
Hard X-ray selection is the most efficient way to discriminate between accretion-powered sources, such as AGN, from sources dominated by starlight. Hard X-rays are also less affect…
The BeppoSAX view of the hard X-ray background
A. Comastri, F. Fiore, P. Giommi +5
First results on a medium-deep X-ray survey in the "new" 5-10 keV band carried out with the MECS detectors onboard BeppoSAX are presented. The High Energy Llarge Area Survey (HELLA…
Hard X-Ray Radiation in the Coma Cluster Spectrum
R. Fusco-Femiano, D. Dal Fiume, L. Feretti +5
Hard X-ray radiation has been detected for the first time in the Coma cluster by BeppoSAX. Thanks to the unprecedented sensitivity of the Phoswich Detection System (PDS) instrument…