High-Frequency QPOs and Overstable Oscillations of Black-Hole Accretion Disks

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F13%3A00398871" target="_blank" >RIV/67985815:_____/13:00398871 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1017/S1743921312019205" target="_blank" >http://dx.doi.org/10.1017/S1743921312019205</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1017/S1743921312019205" target="_blank" >10.1017/S1743921312019205</a>

Result language
angličtina
Original language name
High-Frequency QPOs and Overstable Oscillations of Black-Hole Accretion Disks
Original language description
We review recent works on global oscillation modes in black-hole accretion disks, and explain how, with the help of general relativistic effects, the energy stored in the disk differential rotation can be pumped into global spiral density modes in the disk, making these modes grow to large amplitudes under certain conditions (``corotational instability''). These modes are robust in the presence of disk magnetic fields and turbulence. The computed oscillation mode frequencies are largely consistent withthe observed values for HFQPOs in BH X-ray binaries. The approximate 2:3 frequency ratio is also expected from this model. The connection of HFQPOs with other disk properties (such as production of episodic jets) is also discussed.
Czech name
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Czech description
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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