267 citations · 704 across the 10 of their papers we have counts for
10 papers
Quasars as standard candles VI: spectroscopic validation of the cosmological sample
Bartolomeo Trefoloni, Elisabeta Lusso, Emanuele Nardini +5
A sample of quasars has been recently assembled to investigate the non-linear relation between their monochromatic luminosities at 2500Å, and 2 keV and to exploit quasars as a new…
Search for X-ray occultations in Active Galactic Nuclei
G. Torricelli-Ciamponi, P. Pietrini, G. Risaliti +1
Recent time-resolved spectral studies of a few Active Galactic Nuclei in hard X-rays revealed occultations of the X-ray primary source probably by Broad Line Region (BLR) clouds. A…
X-ray absorption by Broad Line Region Clouds in Mrk 766
G. Risaliti, E. Nardini, M. Salvati +5
We present a new analysis of a 9-day long XMM-Newton monitoring of the Narrow Line Seyfert 1 galaxy Mrk 766. We show that the strong changes in spectral shape which occurred during…
"Comets" orbiting a black hole
R. Maiolino, G. Risaliti, M. Salvati +6
We use a long (300 ksec), continuous Suzaku X-ray observation of the active nucleus in NGC1365 to investigate the structure of the circumnuclear BLR clouds through their occultatio…
Weighing black holes from zero to high redshift
A. Marconi, D. Axon, R. Maiolino +4
The application of the virial theorem provides a tool to estimate supermassive black hole (BH) masses in large samples of active galactic nuclei (AGN) with broad emission lines at…
The effect of radiation pressure on virial black hole mass estimates and the case of Narrow Line Seyfert 1 galaxies
Alessandro Marconi, David Axon, Roberto Maiolino +5
We consider the effect of radiation pressure from ionizing photons on black hole (BH) mass estimates based on the application of the virial theorem to broad emission lines in AGN s…