96 citations · 488 across the 15 of their papers we have counts for
15 papers
Stellar transits across a magnetized accretion torus as a mechanism for plasmoid ejection
Petra Suková, Michal Zajaček, Vojtěch Witzany +1
The close neighbourhood of a supermassive black hole contains not only the accreting gas and dust but also stellar-sized objects, such as late-type and early-type stars and compact…
Perturbing the accretion flow onto a supermassive black hole by a passing star
Petra Suková, Michal Zajaček, Vojtěch Witzany +1
The close neighbourhood of a supermassive black hole contains not only accreting gas and dust, but also stellar-sized objects like stars, stellar-mass black holes, neutron stars, a…
Missing bright red giants in the Galactic center: A fingerprint of its once active state?
Michal Zajaček, Anabella Araudo, Vladimír Karas +5
In the Galactic center nuclear star cluster, bright late-type stars exhibit a flat or even a decreasing surface-density profile, while fainter late-type stars maintain a cusp-like…
Free motion around black holes with discs or rings: between integrability and chaos -- V
L. Polcar, P. Suková, O. Semerák
Complete integrability of geodesic motion, the well known feature of the fields of isolated stationary black holes, can easily be "spoilt" by the presence of some additional source…
Shocks in the relativistic transonic accretion with low angular momentum
Petra Suková, Szymon Charzyński, Agnieszka Janiuk
We perform 1D/2D/3D relativistic hydrodynamical simulations of accretion flows with low angular momentum, filling the gap between spherically symmetric Bondi accretion and disc-lik…
Non-linear behaviour of XTE J1550-564 during its 1998-1999 outburst, revealed by recurrence analysis
Petra Suková, Agnieszka Janiuk
We study the X-ray emission of the microquasar XTE J1550-564 and analyze the properties of its light curves using the recurrence analysis method. The indicators for non-linear dyna…
Numerical test of the method for revealing traces of deterministic chaos in the accreting black holes
Petra Suková, Agnieszka Janiuk
The high energy radiation emitted by black hole X-ray binaries originates in an accretion disk, hence the variability of the lightcurves mirrors the dynamics of the disc. We study…
Relativistic low angular momentum accretion in 3D
Petra Suková, Szymon Charzyński, Agnieszka Janiuk
We study the low angular momentum accretion of matter onto Schwarzschild or Kerr black hole using fully relativistic numerical simulations. Our aim is to include the rotation of bo…
On geodesic dynamics in deformed black-hole fields
Oldřich Semerák, Petra Suková
"Almost all" seems to be known about isolated stationary black holes in asymptotically flat space-times and about the behaviour of {\em test} matter and fields in their backgrounds…
Chaotic and stochastic processes in the accretion flows of the black hole X-ray binaries revealed by recurrence analysis
Petra Suková, Mikolaj Grzedzielski, Agnieszka Janiuk
The black hole candidates exhibit fast variability of their X-ray emission on a wide range of timescales. The short, coherent variations, with frequencies above 1 Hz, are referred…
Free motion around black holes with discs or rings: between integrability and chaos -- IV
V. Witzany, O. Semerak, P. Sukova
The dynamical system studied in previous papers of this series, namely a bound time-like geodesic motion in the exact static and axially symmetric space-time of an (originally) Sch…
Oscillating shocks in the low angular momentum flows as a source of variability of accreting black holes
Petra Suková, Agnieszka Janiuk
We derive the conditions for shock formation in a quasi-spherical, slightly rotating flows. We verify the results of semi-analytical, stationary calculations with the time evolutio…
Free motion around black holes with discs or rings: between integrability and chaos - III
P. Suková, O. Semerák
We continue the study of time-like geodesic dynamics in exact static, axially and reflection symmetric space-times describing the fields of a Schwarzschild black hole surrounded by…
Free motion around black holes with discs or rings: between integrability and chaos - II
O. Semerák, P. Suková
We continue the study of time-like geodesic dynamics in exact static, axially and reflection symmetric space-times describing the fields of a Schwarzschild black hole surrounded by…
Free motion around black holes with discs or rings: between integrability and chaos - I
O. Semerák, P. Suková
Geodesic dynamics is regular in the fields of isolated stationary black holes. However, due to the presence of unstable periodic orbits, it easily becomes chaotic under various per…