潮汐压缩的暗物质团的耀斑
Flaring of tidally compressed dark-matter clumps
摘要：
本文探讨了超大质量黑洞对暗物质团的潮汐压缩事件的物理和观测结果。我们的分析计算表明，一个DMC接近SMBH比潮汐半径近得多经历了显着的压缩沿轴垂直于轨道平面，后不久，近心通道。对于由自湮灭暗物质粒子组成的DMC，我们发现DMC密度和速度色散的增加导致湮灭率的耀斑，对于速度依赖的湮灭截面最明显。如果湮灭的最终产物是光子，这将导致伽马射线耀斑，费米望远镜在一定范围的模型参数下可以检测到（并且可能已经检测到）。如果暗物质湮灭的最终产物是相对论性电子和正电子，并且局部磁场足够大，则暗物质湮灭的TCE可以导致同步辐射耀斑。最后，DMC的TCE会导致引力波的爆发，除了轨道运动单独辐射的引力波之外，还有不同的频谱。这些瞬态现象为探索暗物质的性质提供了有趣的新途径。
英文摘要：
We explore the physics and observational consequences of tidal compression events (TCEs) of dark-matter clumps (DMCs) by supermassive black holes (SMBHs). Our analytic calculations show that a DMC approaching a SMBH much closer than the tidal radius undergoes significant compression along the axis perpendicular to the orbital plane, shortly after pericenter passage. For DMCs composed of self-annihilating dark-matter particles, we find that the boosted DMC density and velocity dispersion lead to a flaring of the annihilation rate, most pronounced for a velocity- dependent annihilation cross section. If the end products of the annihilation are photons, this results in a gamma-ray flare, detectable (and possibly already detected) by the Fermi telescope for a range of model parameters. If the end products of dark-matter annihilation are relativistic electrons and positrons and the local magnetic field is large enough, TCEs of DMCs can lead to flares of synchrotron radiation. Finally, TCEs of DMCs lead to a burst of gravitational waves, in addition to the ones radiated by the orbital motion alone, and with a different frequency spectrum. These transient phenomena provide interesting new avenues to explore the properties of dark matter.
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