43 citations · 228 across the 11 of their papers we have counts for
6 papers · 1 filter
Constraining models of twin peak quasi-periodic oscillations with realistic neutron star equations of state
Gabriel Török, Kateřina Goluchová, Martin Urbanec +8
Twin-peak quasi-periodic oscillations (QPOs) are observed in the X-ray power-density spectra of several accreting low-mass neutron star (NS) binaries. In our previous work we have…
Theoretical modelling of the AGN iron-line vs continuum time-lags in the lamp-post geometry
A. Epitropakis, I. E. Papadakis, M. Dovčiak +4
Context: Theoretical modelling of time-lags between variations in the Fe K emission and the X-ray continuum might shed light on the physics and geometry of the X-ray emitting re…
Signatures of X-ray reverberation in the power spectra of AGN
I. Papadakis, T. Pechacek, M. Dovciak +3
We compute fully relativistic disc response functions in the case of the "lamp-post" geometry using the full observed reflection spectrum for various X-ray source heights, disc inc…
Twin peak quasi-periodic oscillations as signature of oscillating cusp torus
Gabriel Török, Kateřina Goluchová, Jiří Horák +4
Serious theoretical effort has been devoted to explain the observed frequencies of twin-peak quasi-periodic oscillations (HF QPOs) observed in low-mass X-ray neutron star binaries.…
Hot-spot model for accretion disc variability as random process - II. Mathematics of the power-spectrum break frequency
Tomas Pechacek, Rene W. Goosmann, Vladimir Karas +2
We study some general properties of accretion disc variability in the context of stationary random processes. In particular, we are interested in mathematical constraints that can…
The flare model for X-ray variability of NGC 4258
T. Trzesniewski, B. Czerny, V. Karas +4
We study the variability mechanism of active galactic nuclei (AGN) within the framework of the flare model. To this end we examine the case of Seyfert/LINER galaxy NGC 4258, which…