217 citations · 1k across the 20 of their papers we have counts for
8 papers · 2 filters
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_…
Optical identification of sources from the HELLAS2XMM survey
F. Fiore, G. Matt, F. La Franca +10
We present preliminary results on the optical identifications of sources from the High Energy Large Area Survey performed with XMM-Newton (HELLAS2XMM). This survey covers about 3 s…
The HELLAS2XMM survey: I. The X-ray data and the Log(N)-Log(S)
A. Baldi, S. Molendi, A. Comastri +3
We present the first results from an XMM-Newton serendipitous medium-deep survey, which covers nearly three square degrees. We detect a total of 1022, 495 and 100 sources, down to…
On the nature of X-ray absorption in Seyfert 2 galaxies
M. Guainazzi, F. Fiore, G. Matt +1
We have studied the correlation among X-ray absorption, optical reddening and nuclear dust morphology in Seyfert 2 galaxies. Two main conclusions emerge: a) the Balmer decrement an…
A hard X-ray constraint on the presence of an AGN in the ultra-luminous infrared galaxy Arp220
K. Iwasawa, G. Matt, M. Guainazzi +1
We present X-ray results on the ultraluminous infrared galaxy Arp220 obtained with BeppoSAX. The X-ray emission up to 10 keV is detected. No significant signal is detected with the…
High Energy Large Area Surveys: from BeppoSAX to Chandra and XMM
F. Fiore, A. Comastri, F. La Franca +3
Optical identification of hard X-ray selected BeppoSAX and Chandra sources indicates that a large fraction of the sources are ``intermediate'' AGN, i.e. type 1.8-1.9 AGN, broad-lin…