Imaging bright-spots in the accretion flow near the black hole horizon of Sgr A

被引:157
作者
Broderick, AE [1 ]
Loeb, A [1 ]
机构
[1] Harvard Smithsonian Ctr Astrophys, Inst Theory & Computat, Cambridge, MA 02138 USA
基金
美国国家科学基金会;
关键词
black hole physics; relativity; techniques : interferometric; Galaxy : centre; submillimetre;
D O I
10.1111/j.1365-2966.2005.09458.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Images from the vicinity of the black hole horizon at the Galactic centre (Sgr A*) could be obtained in the near future with a Very Large Baseline Array of submillimetre telescopes. The recently observed short-term infrared and X-ray variability of the emission from Sgr A* implies that the accretion flow near the black hole is clumpy or unsteady. We calculate the appearance of a compact emission region (bright-spot) in a circular orbit around a spinning black hole as a function of orbital radius and orientation. We find that the mass and spin of the black hole can be extracted from their generic signatures on the spot image as well as on the light curves of its observed flux and polarization. The strong field distortion remains notable even when the spot image is smoothed over the expected similar to 20-mu as resolution of the future submillimetre observations.
引用
收藏
页码:353 / 362
页数:10
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