Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pasj...63.1093m&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.63, No.5, pp.1093-1116
Physics
Accretion, Accretion Disks, Black Hole Physics, Quasi-Periodic Oscillations, Radio: Individuals (Sagittarius A*)
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, 31.4±1.5, 56.4±6 min roughly in a 3:4:6:10 ratio. The first two periods show a rotating one-arm structure, while P = 31.4 min shows a rotating 3-arm structure, as if viewed edge-on. At the central 50 μas the P = 56.4 min period shows a double-amplitude variation of those in its surroundings. The spatial distributions of the oscillation periods suggest that the disk of Sgr A* is roughly edge-on, rotating around an axis with PA = -10°. Presumably, the observed VLBI images of Sgr A* at 43 GHz retain several features of the black hole accretion disk of Sgr A* in spite of being obscured and broadened by scattering of surrounding plasma.
Kato Yoshiaki
Miyoshi Makoto
Oyama Tomoaki
Shen Zhi-Qiang
Takahashi Rohta
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