4 papers
The evolution of AGN in the Hard X-rays from HELLAS
F. La Franca, F. Fiore, C. Vignali +3
We present optical spectroscopic identification of sources identified in the BeppoSAX MECS fields of the High Energy LLarge Area Survey (HELLAS). In total 62 sources from a sample…
A toroidal black hole for the AGN phenomenon
Fulvio Pompilio, S. M. Harun-or-Rashid, Matts Roos
A new approach to the study of the AGN phenomenon is proposed, in which the nucleus activity is related to the metric of the inner massive black hole. The possibility of a Toroidal…
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…