141 citations · 855 across the 31 of their papers we have counts for
29 papers · 1 filter
Thermal instability in X-ray photoionized media in Active Galactic Nuclei: Influence on the gas structure and spectral features
A. C. Goncalves, S. Collin, A. -M. Dumont +1
A photoionized gas in thermal equilibrium can display a thermal instability, with 3 or more solutions in the multi-branch region of the S-shape curve giving the temperature versus…
A new model for the Warm Absorber in NGC 3783: a single medium in total pressure equilibrium
A. C. Goncalves, S. Collin, A. -M. Dumont +4
(Abridged) Many active galactic nuclei exhibit X-ray features typical of the highly ionized gas called "Warm Absorber" (WA). Such a material appears to be stratified, displaying zo…
The puzzle of the soft X-ray excess in AGN: absorption or reflection?
L. Chevallier, S. Collin, A. -M. Dumont +4
The 2-10 keV continuum of AGN is generally well represented by a single power law. However, at smaller energies the continuum displays an excess with respect to the extrapolation o…
Modeling the Warm Absorber in AGN
A. Rozanska, R. Goosmann, A. -M. Dumont +1
We present a wide grid of models for the structure and transmission properties of warm absorbers in active galactic nuclei (AGN). Contrary to commonly used constant density models,…
The role of absorption and reflection in the soft X-ray excess of Active Galactic Nuclei : 1. Preliminary results
Loïc Chevallier, Suzy Collin, Anne-Marie Dumont +4
The 2-10 keV continuum of AGN is well represented by a single power law, generally attributed to a hot comptonizing medium, such as a corona above the accretion disk. At smaller en…
X-ray Variability of Active Galactic Nuclei and the Flare Model
R. W. Goosmann, B. Czerny, A. -M. Dumont +4
Short-term variability of X-ray spectra has been reported for several Active Galactic Nuclei. Significant X-ray flux variations are observed within time scales down to 10^4 -- 10^5…