93 citations · 801 across the 44 of their papers we have counts for
5 papers · 1 filter
Testing warm Comptonization models for the origin of the soft X-ray excess in AGN
P. O. Petrucci, F. Ursini, A. De Rosa +5
The X-ray spectra of many active galactic nuclei (AGN) show a soft X-ray excess below 1-2 keV on top of the extrapolated high- energy power law. The origin of this component is unc…
Multi-wavelength campaign on NGC7469 II. Column densities and variability in the X-ray spectrum
U. Peretz, E. Behar, G. A. Kriss +16
We investigate the ionic column density variability of the ionized outflows associated with NGC7469, to estimate their location and power. This could allow a better understan…
Chasing obscuration in type-I AGN: discovery of an eclipsing clumpy wind at the outer broad-line region of NGC 3783
M. Mehdipour, J. S. Kaastra, G. A. Kriss +21
In 2016 we carried out a Swift monitoring program to track the X-ray hardness variability of eight type-I AGN over a year. The purpose of this monitoring was to find intense obscur…
Evolution of the reverberation lag in GX 339-4 at the end of an outburst
B. De Marco, G. Ponti, P. O. Petrucci +13
We studied X-ray reverberation lags in the BHXRB GX 339-4 at the end of the 2014-2015 outburst. We analysed data from a XMM-Newton campaign covering the end of the transition from…
A long term study of AGN X-ray variability. Structure function analysis on a ROSAT-XMM quasar sample
R. Middei, F. Vagnetti, S. Bianchi +3
Variability in the X-rays is a key ingredient in understanding and unveiling active galactic nuclei (AGN) properties. In this band flux variations occur on short time scales (hours…