32 citations · 114 across the 7 of their papers we have counts for
7 papers
Modeling changing-look (CL) AGN phenomenon in 1D using accretion disk instabilities
Marzena Sniegowska, Mikolaj Grzedzielski, Bozena Czerny +1
Apart from regular, low-level stochastic variability, some AGN occasionally show exceptionally large changes in the luminosity, spectral shape, and/or X-ray absorption. The most no…
Local stability and global instability in iron-opaque disks
Mikolaj Grzedzielski, Agnieszka Janiuk, Bozena Czerny
The thermal stability of accretion disk and the possibility to see a limit-cycle behaviour strongly depends on the ability of the disk plasma to cool down. Various processes connec…
The universal "heartbeat" oscillations in black hole systems accross the mass-scale
Qingwen Wu, Bozena Czerny, Mikolaj Grzedzielski +7
The hyperluminous X-ray source (HLX-1, the peak X-ray luminosity ) near the spiral galaxy ESO 243-49 is possibly the best candidate for intermediate ma…
Non-linear variability in microquasars in relation with the winds from their accretion disks
Agnieszka Janiuk, Mikolaj Grzedzielski, Petra Sukova +3
The microquasar IGR J17091-3624, which is the recently discovered analogue of the well known source GRS 1915+105, exhibits quasi-periodic outbursts, with a period of 5-70 seconds,…
Deterministic chaos in the X-Ray sources
M. Grzedzielski, P. Sukova, A. Janiuk
Hardly any of the observed black hole accretion disks in X-Ray binaries and active galaxies shows constant flux. When the local stochastic variations of the disk occur at specific…
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…
Interplay between heartbeat oscillations and wind outflow in microquasar IGR J17091-3624
Agnieszka Janiuk, Mikolaj Grzedzielski, Fiamma Capitanio +1
During the bright outburst in 2011, the black hole candidate IGR J17091-3624 exhibited strong quasi-periodic flare-like events (on timescales of tens of seconds) in some characteri…