63 citations · 134 across the 8 of their papers we have counts for
8 papers
The BeppoSAX High Energy Large Area Survey -V. The nature of the hard X-ray source populations and its evolution
F. La Franca, F. Fiore, C. Vignali +7
We present optical spectroscopic identifications of hard X-ray (5-10 keV) selected sources belonging to the HELLAS sample obtained with BeppoSAX down to a 5-10 keV flux limit of f_…
An inhomogeneous fractal cosmological model
Fulvio Pompilio, Marco Montuori
We present a cosmological model in which the metric allows for an inhomogeneous Universe with no intrinsic symmetries (Stephani models), providing the ideal features to describe a…
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…
Resolving the 10-40 keV Cosmic X-ray Background with Constellation-X
Giorgio Matt, Fulvio Pompilio, Fabio La Franca
The energy density of the Cosmic X-ray background (XRB) peaks around 30 keV (see Figure 1), an energy not yet probed by focussing imaging instruments. The first hard X-ray telescop…
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…