A STAR DISRUPTED BY A STELLAR BLACK HOLE AS THE ORIGIN OF THE CLOUD FALLING TOWARD THE GALACTIC CENTER
A STAR DISRUPTED BY A STELLAR BLACK HOLE AS THE ORIGIN OF THE CLOUD FALLING TOWARD THE GALACTIC CENTER
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一颗恒星被恒星黑洞扰乱，作为云落向银河中心的起源
DOI：
10.1088/0004-637x/756/1/86
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
J. Miralda
中科院分区：
文献类型：
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作者：
J. Miralda
我们提出，云在银河系中心黑洞附近的高偏心轨道上移动，由Gillessen等人报道，是由起源于围绕星星的圆盘中的光蒸发风形成的，该圆盘在每一次经过周圈时都受到潮汐扰动和冲击。这个圆盘被认为是当一个恒星黑洞飞过星星时形成的，潮汐破坏了它的外壳，并将星星置于它现在的轨道上，一些潮汐碎片形成了一个圆盘。在观测到的云位置发生的破坏性碰撞很可能是由恒星黑洞引起的，因为预期的动力学质量分离;这些形成盘的碰撞的速率可能高达每年10−6次。星星也应该在碰撞中旋转起来，所以圆盘可能随后通过吸收来自星星的角动量而膨胀。一旦圆盘膨胀到潮汐截断半径，每个周点的圆盘外缘的潮汐扰动可能会将气体流置于更大的轨道上，这可能会引起在每个轨道上形成云的光蒸发风。这个模型预测，当星云在2013年下一次经过近周点时被破坏后，一个较小的未被解决的星云将在同一轨道上的星星周围逐渐生长。当到达周点时，也可以检测到来自盘的增加的红外光度。我们还注意到，这个模型恢复了行星形成的相遇理论。
We propose that the cloud moving on a highly eccentric orbit near the central black hole in our Galaxy, reported by Gillessen et al., is formed by a photoevaporation wind originating in a disk around a star that is tidally perturbed and shocked at every peribothron passage. The disk is proposed to have formed when a stellar black hole flew by the star, tidally disrupted its envelope, and placed the star on its present orbit with some of the tidal debris forming a disk. A disrupting encounter at the location of the observed cloud is most likely to be caused by a stellar black hole because of the expected dynamical mass segregation; the rate of these disk-forming encounters may be as high as ∼10−6 per year. The star should also be spun up by the encounter, so the disk may subsequently expand by absorbing angular momentum from the star. Once the disk expands up to the tidal truncation radius, the tidal perturbation of the outer disk edge at every peribothron may place gas streams on larger orbits, which can give rise to a photoevaporation wind that forms the cloud at every orbit. This model predicts that, after the cloud is disrupted at the next peribothron passage in 2013, a smaller unresolved cloud will gradually grow around the star on the same present orbit. An increased infrared luminosity from the disk may also be detectable when the peribothron is reached. We also note that this model revives the encounter theory for planet formation.
DOI：
10.1088/0004-637x/750/1/58
发表时间：
2012-01
期刊：
The Astrophysical Journal
影响因子：
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作者：
A. Burkert;M. Schartmann;C. Alig;S. Gillessen;R. Genzel;T. Fritz;F. Eisenhauer
通讯作者：
A. Burkert;M. Schartmann;C. Alig;S. Gillessen;R. Genzel;T. Fritz;F. Eisenhauer