20 citations · 63 across the 12 of their papers we have counts for
4 papers · 2 filters
Rayleigh and Solberg criteria reversal near black holes: the optical geometry explanation
Marek A. Abramowicz
The familiar Newtonian version of the Rayleigh criterion demands that for dynamical stability the specific angular momentum should increase with the increasing circumferential radi…
Epicyclic frequencies derived from the effective potential: simple and practical formulae
M. A. Abramowicz, W. Kluzniak
We present and discuss a short and simple derivation of orbital epicyclic frequencies for circular geodesic orbits in stationary and axially symmetric spacetimes. Such spacetimes i…
Resonance in Forced Oscillations of an Accretion Disk and Kilohertz Quasi Periodic Oscillations
William H. Lee, Marek A. Abramowicz, Wlodek Kluzniak
We have performed numerical simulations of a radially perturbed "accretion" torus around a black hole or neutron star and find that the torus performs radial and vertical motions a…
The orbital resonance model for twin peak kHz QPOs
Marek A. Abramowicz, Wlodek Kluzniak, Zdenek Stuchlik +1
Many Galactic black hole and neutron star sources in low X-ray mass binaries show QPOs (quasi periodic oscillations) in their observed X-ray fluxes, i.e. peaks in the Fourier varia…