PHYSICAL PROPERTIES OF THE INNER SHOCKS IN HOT, TILTED BLACK HOLE ACCRETION FLOWS
PHYSICAL PROPERTIES OF THE INNER SHOCKS IN HOT, TILTED BLACK HOLE ACCRETION FLOWS
复制标题
热倾斜黑洞吸积流中内部激波的物理特性
DOI：
10.1088/0004-637x/780/1/81
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
K. B. Henisey
中科院分区：
文献类型：
--
作者：
A. Generozov;O. Blaes;P. C. Fragile;K. B. Henisey
热的，压力支持，倾斜的黑洞吸积流，其中的流的角动量与黑洞的自旋轴错位的模拟，可以表现出两个非轴对称的激波结构中的内部区域的流。我们分析了这些冲击波结构的强度和意义，在模拟与倾斜角为10°和15°。通过整合模拟中的流体轨迹，通过冲击和跟踪流体量的变化沿着这些轨迹，我们表明，这些冲击是强大的，具有相当大的压缩比，与早期的索赔。然而，它们只是适度的相对论。我们还表明，这两个密度增强类似流在他们的形状，实际上仅仅是后冲击压缩，作为流体轨迹切断，而不是流沿着，他们。与激波相关的耗散是平流进入洞内的静止质量能量的很大一部分（13%-12%），因此与湍流的耗散相当。因此，冲击应该使观察到的黑洞吸积流是倾斜的属性的顺序统一的变化。
Simulations of hot, pressure-supported, tilted black hole accretion flows, in which the angular momentum of the flow is misaligned with the black hole spin axis, can exhibit two nonaxisymmetric shock structures in the inner regions of the flow. We analyze the strength and significance of these shock structures in simulations with tilt angles of 10° and 15°. By integrating fluid trajectories in the simulations through the shocks and tracking the variations of fluid quantities along these trajectories, we show that these shocks are strong, with substantial compression ratios, in contrast to earlier claims. However, they are only moderately relativistic. We also show that the two density enhancements resembling flow streams in their shape are in fact merely post-shock compressions, as fluid trajectories cut across, rather than flow along, them. The dissipation associated with the shocks is a substantial fraction (≃ 3%–12%) of the rest mass energy advected into the hole, and therefore comparable to the dissipation expected from turbulence. The shocks should therefore make order unity changes in the observed properties of black hole accretion flows that are tilted.