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arXiv 1102.0260astro-ph.COastro-ph.GA
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关于星系核中的小黑洞

On minor black holes in galactic nuclei

Barry McKernan, K. E. Saavik Ford, Tahir Yaqoob, Lisa M. Winter

摘要:

由于恒星演化、微小的合并和引力动力学摩擦,在星系核中可能存在中小质量的黑洞。如果这些小的黑洞以X射线双星或超亮X射线源的形式吸积,并与恒星形成有关,它们就可以解释许多低光度活动星系核或LINER的观测结果。吸积和吸入中等质量的黑洞可以为强引力波特征提供关键的电磁对应物,从而允许强引力的测试。在这里,我们讨论的观测签名的星系核中的小黑洞,我们表明,在LINER或过渡型对象中观察到的光学线比可以产生的电离辐射场从ULXs。最后,我们讨论了现有的观察以及候选人为未来的研究的限制。

英文摘要:

Small and intermediate mass black holes should be expected in galactic nuclei as a result of stellar evolution, minor mergers and gravitational dynamical friction. If these minor black holes accrete as X-ray binaries or ultra-luminous X-ray sources, and are associated with star formation, they could account for observations of many low luminosity AGN or LINERs. Accreting and inspiralling intermediate mass black holes could provide a crucial electromagnetic counterpart to strong gravitational wave signatures, allowing tests of strong gravity. Here we discuss observational signatures of minor black holes in galactic nuclei and we demonstrate that optical line ratios observed in LINERs or transition-type objects can be produced by an ionizing radiation field from ULXs. We conclude by discussing constraints from existing observations as well as candidates for future study.

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