133 citations · 833 across the 26 of their papers we have counts for
10 papers · 1 filter
The High Energy Spectrum of NGC 4151
V. Beckmann, C. R. Shrader, N. Gehrels +5
We present the first INTEGRAL observations of the type 1.5 Seyfert galaxy NGC 4151. Combining several INTEGRAL observations performed during 2003, totaling about 400 ks of exposure…
Periodic long-term X-ray and radio variability of Cygnus X-1
Pawel Lachowicz, Andrzej A. Zdziarski, Alex Schwarzenberg-Czerny +2
We present a comprehensive analysis of long-term periodic variability of Cyg X-1 using the method of multiharmonic analysis of variance (mhAoV) applied to available monitoring data…
Bulk motion Comptonization in black-hole accretion flows
Andrzej Niedzwiecki, Andrzej A. Zdziarski
We study spectra generated by Comptonization of soft photons by cold electrons radially free-falling onto a black hole. We use a Monte Carlo method involving a fully relativistic d…
Patterns of energy-dependent variability from Comptonization
Marek Gierlinski, Andrzej A. Zdziarski
We study fractional variability as a function of energy from black-hole X-ray binaries on timescales from milliseconds to hundreds of seconds. We build a theoretical model of energ…
INTEGRAL & RXTE Power Spectra of Cygnus X-1
K. Pottschmidt, J. Wilms, M. A. Nowak +3
We evaluate 0.03-20 Hz power spectra of the bright black hole binary Cyg X-1 obtained from non-deconvolved INTEGRAL-ISGRI event data. The ISGRI power spectra are compared to contem…
Energy-dependent variability from accretion flows
Andrzej A. Zdziarski
We develop a formalism to calculate energy-dependent fractional variability (rms) in accretion flows. We consider rms spectra resulting from radial dependencies of the level of loc…