Oscillation Phenomena in the disk around the massive black hole Sagittarius A*

Details Oscillation Phenomena in the disk around the massive black hole Sagittarius A* Oscillation Phenomena in the disk around the massive black hole Sagittarius A*

2009-06-30

arxiv.org/abs/0906.5511v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

24 pages, 20 figures, revised version submitted to MN main journal (2010, Jan., 12th)

Scientific paper

We report the detection of radio QPOs with structure changes using the Very Long Baseline Array (VLBA) at 43 GHz. We found conspicuous patterned changes of the structure with P = 16.8 +- 1.4, 22.2 +- 1.4, 31.2 +- 1.5, 56.4 +- 6 min, very roughly in a 3:4:6:10 ratio. The first two periods show a rotating one-arm structure, while the P = 31.4 min shows a rotating 3-arm structure, as if viewed edge-on. At the central 50 microasec the P = 56.4 min period shows a double amplitude variation of those in its surroundings. Spatial distributions of the oscillation periods suggest that the disk of SgrA* is roughly edge-on, rotating around an axis with PA = -10 degree. Presumably, the observed VLBI images of SgrA* at 43 GHz retain several features of the black hole accretion disk of SgrA* in spite of being obscured and broadened by scattering of surrounding plasma.

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