6 papers
On Seyfert spectra and variability
P. Magdziarz
We discuss the observational phenomenology of Seyferts from the point of view of the disk model, and argue that the spectral variability may be related to geometrical changes of th…
A model of the broad-band continuum of NGC 5548
P. Magdziarz, O. Blaes
We discuss a model of the central source in Seyfert 1 galaxy NGC 5548. The model assumes a three phase disk structure consisting of a cold outer disk, a hot central disk constituti…
Gamma-ray flux variability in the sample of EGRET blazars
P. Magdziarz, R. Moderski, G. M. Madejski
We analyze average gamma-ray variability statistics for the sample of blazars detected by CGRO/EGRET. We re-reduce all the available EGRET observations and analyze light curves by…
X-rays and gamma-rays from accretion flows onto black holes in Seyferts and X-ray binaries
Andrzej A. Zdziarski, W. Neil Johnson, Juri Poutanen +2
We review observations and theoretical models of X-ray/gamma-ray spectra of radio-quiet Seyfert galaxies and of Galactic black-hole candidates (in the hard spectral state). The obs…
Green's functions for transmission of X-rays and gamma-rays through cold media
P. Magdziarz, A. A. Zdziarski
Using a Monte Carlo method, we study Compton scattering and absorption of X-rays and gamma-rays in cold media. We consider transmission of X/gamma-rays through a shell of an arbitr…
The nature of the X-ray source in NGC 4151
P. Magdziarz, A. A. Zdziarski
Analysis of broad-band X/-ray spectra of NGC~4151 from contemporaneous observations by {\it GRO}/OSSE, {\it ROSAT}, {\it Ginga} and {\it ASCA}, shows that the data are well mode…