51 citations · 56 across the 6 of their papers we have counts for
6 papers · 1 filter
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…
On the peculiar X-ray properties of the bright nearby radio-quiet quasar PDS456
C. Vignali, A. Comastri, F. Nicastro +3
BeppoSAX and ASCA observations of the nearby (z=0.184), high-luminosity, radio-quiet quasar PDS456 are presented. The X-ray spectrum is characterized by a prominent ionized edge at…
BeppoSAX broad-band observations of low-redshift quasars: Spectral curvature and iron K_alpha lines
T. Mineo, F. Fiore, A. Laor +7
We present results from BeppoSAX observations of 10 low redshift quasars. The quasars are part of the Laor et al. (1997) sample of 23 optically selected PG quasars with redshift <0…
Optically dim counterparts of hard X-ray selected AGNs
R. Maiolino, M. Salvati, L. A. Antonelli +9
We present near-IR photometry and imaging observations of a small sample of sources identified in the BeppoSAX 5-10 keV survey (HELLAS) which resolves ~ 20-30% of the X-ray backgro…
Extended X-ray emission from FRIIs and RL quasars
G. Setti, G. Brunetti, A. Comastri
We review the evidence that detectable fluxes of X-rays are produced by inverse Compton scattering of nuclear photons with the relativistic electrons in the radio lobes of strong F…
The BeppoSAX High Energy Large Area Survey (HELLAS): a progress Report
A. Comastri, F. Fiore, C. Vignali +2
The integrated emission of highly obscured AGN is expected to provide a major contribution to the X-ray energy density in the Universe: the X-ray background (XRB). The study of the…