Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-10-05
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
2 pages, 2 figures; Proceedings of the 275 IAU Symposium "Jets at all scales", Buenos Aires, 13-17.09.2010; eds. G. Romero, R.
Scientific paper
We present various instability mechanisms in the accreting black hole systems which might indicate at the connection between the accretion disk and jet. The jets observed in microquasars can have a persistent or blobby morphology. Correlated with the accretion luminosity, this might provide a link to the cyclic outbursts of the disk. Such duty-cycle type of behavior on short timescales results from the thermal instability caused by the radiation pressure domination. The same type of instability may explain the cyclic radioactivity of the supermassive black hole systems. The somewhat longer timescales are characteristic for the instability caused by the partial hydrogen ionization. The distortions of the jet direction and complex morphology of the sources can be caused by precession of the disk-jet axis.
Czerny Bozena
Janiuk Agnieszka
Moscibrodzka Monika
Siemiginowska Aneta
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