Oscillation Phenomena in Sagittarius A*

被引：0
作者：
Miyoshi, M. [1 ]
Oyama, T. [1 ]
Shen, Z. -Q. [2 ]
Takahashi, R. [3 ]
Kato, Y. [4 ]
机构：
[1] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
[2] Shanghai Astron Observ, Shanghai, Peoples R China
[3] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan
[4] Japan Aerosp Explorat Agcy JAXA, ISAS, Sagamihara, Kanagawa, Japan
来源：
GALACTIC CENTER: A WINDOW TO THE NUCLEAR ENVIRONMENT OF DISK GALAXIES | 2011年 / 439卷
关键词：
NEAR-INFRARED FLARES; BLACK-HOLE; GALACTIC-CENTER; SIZE;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 mu as the P = 56.4 mm 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 degrees. 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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页码：336 / +
页数：2
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