Global MHD instabilities: from Low Frequency to High Frequency QPOs, and to Sgr A*

Details Global MHD instabilities: from Low Frequency to High Frequency QPOs, and to Sgr A* Global MHD instabilities: from Low Frequency to High Frequency QPOs, and to Sgr A*

2006-12-07

arxiv.org/abs/astro-ph/0612175v1

PoSMQW6:031,2006

Astronomy and Astrophysics

Astrophysics

11 pages, 8 figures, in the proceedings of the VI Microquasar Workshop "Microquasars and beyond", Como, 2006 Sep 18-22 (Italy)

Scientific paper

I review recent work that goes beyond our model for the Low-Frequency Quasi-Periodic Oscillation of microquasars, based on the Accretion-Ejection Instability. I show that similar instabilities, which can be viewed as strongly unstable versions of the diskoseismologic modes, provide explanations for both the High-Frequency QPO and for the quasi-periodicity observed durng the flares of Sgr A*, the supermassive black hole at the Galactic Center.

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