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Steeper Stellar Cusps in Galactic Centers from Binary Disruption

机译:银河系中心的Steeper Stellar Cusps受到二元干扰的影响

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The relaxed distribution of stars around a massive black hole is known to follow a cusp profile, , with a characteristic slope . This follows from energy conservation and a scattering rate given by two-body encounters. However, we show that the injection of stars close to the black hole, i.e., a source term in the standard cusp picture, modifies this profile. In the steady-state configuration, the cusp develops a central region with a typical slope in which stars diffuse outward. Binary disruption by the intense tidal field of the massive black hole is among the phenomena that take place in the Galactic Center (GC). In such a disruption, one of the binary members remains bound to the black hole, thus providing a source term of stars close to the black hole. Assuming a binary fraction of 0.1 and an orbital circularization efficiency of 0.35, we show that this source is strong enough to modify the cusp profile within pc of the GC. If the binary fraction at the influence radius is of order unity and the orbits of all captured stars are efficiently circularized, the steeper cusp extends almost as far as the radius of influence of the black hole.
机译:众所周知,巨大黑洞周围恒星的松弛分布遵循尖峰轮廓,并具有特征斜率。这是由于能量守恒和两体相遇给出的散射率。但是,我们表明,靠近黑洞的恒星注入(即标准尖峰图片中的源项)会修改此轮廓。在稳态配置中,尖点形成一个中心区域,该区域具有典型的坡度,其中恒星向外扩散。银河系中心(GC)发生的现象之一是由于巨大黑洞的强烈潮汐场造成的二进制破坏。在这样的破坏中,二元成员之一仍然束缚在黑洞上,因此提供了接近黑洞的恒星的源项。假设二进制分数为0.1,轨道圆化效率为0.35,我们表明此源足够强大,可以修改GC pc的尖峰轮廓。如果影响半径处的二元分数为一阶,并且所有捕获的恒星的轨道均被有效地圆形化,则陡峭的尖端几乎延伸到黑洞的影响半径。

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