49 citations · 137 across the 4 of their papers we have counts for
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Modelling the energy dependencies of high-frequency QPO in black hole X-ray binaries
P. T. Zycki, A. Niedzwiecki, M. A. Sobolewska
We model energy dependencies of the quasi periodic oscillations (QPO) in the model of disc epicyclic motions, with X-ray modulation caused by varying relativistic effects. The mode…
The iron K feature in Narrow Line Seyfert 1's: evidence for a P Cygni profile?
C. Done, M. A. Sobolewska, Marek Gierlinski +1
Narrow Line Seyfert 1 galaxies are generally accreting at high fractions of the Eddington limit. They can show complex X-ray spectra, with a strong `soft excess' below 2 keV and a…
What is the origin of the soft excess in AGN?
Malgorzata A. Sobolewska, Chris Done
We investigate the nature of the soft excess below 1 keV observed in AGN. We use the XMM-Newton data of the low redshift, optically bright quasar, PG 1211+143, and we compare it wi…
Spectral and Fourier analyses of X-ray QPO in accreting black holes
M. A. Sobolewska, P. T. Zycki
We study energy dependencies of quasi-periodic oscillations from a number of black hole X-ray binaries. The selected sources were observed by RXTE at time periods close to state tr…