67 citations · 222 across the 14 of their papers we have counts for
14 papers
Thermal instability in X-ray photoionized media in Active Galactic Nuclei: II. Role of the thermal conduction in warm absorber
B. Czerny, L. Chevallier, A. C. Goncalves +2
A photoionized gas under constant pressure can display a thermal instability, with three or more solutions for possible thermal equilibrium. A unique solution of the structure of t…
Response of the warm absorber cloud to a variable nuclear flux in active galactic nuclei
L. Chevallier, B. Czerny, A. Rozanska +1
Recent modeling of the warm absorber in active galactic nuclei has proved the usefulness of constant total (gas plus radiation) pressure models, which are highly stratified in temp…
Exact results in modeling planetary atmospheres--I. Gray atmospheres
Loic Chevallier, Joachim Pelkowski, Bernard Rutily
An exact model is proposed for a gray, isotropically scattering planetary atmosphere in radiative equilibrium. The slab is illuminated on one side by a collimated beam and is bound…
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…
Thermalisation of electrons in a stellar atmosphere
L. Chevallier
We are interested in electrons kinetics in a stellar atmosphere to validate or invalidate the usually accepted hypothesis of thermalisation of electrons. For this purpose, we calcu…
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…