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arXiv 0705.4263astro-ph
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类星体中的黑洞

Recoiling Black Holes in Quasars

E. W. Bonning, G. A. Shields, S. Salviander

摘要:

最近对合并有自旋的黑洞的模拟给出了引力辐射的反冲速度高达几千公里/秒。一个反冲的超大质量黑洞可以保留它的吸积盘的内部,当黑洞远离星系核时,为持续数百万年的类星体阶段提供燃料。反冲吸积盘的一种可能的观测表现是类星体发射线的速度偏离宿主星系。我们研究了斯隆数字巡天的类星体,宽发射线相对于窄发射线有很大的偏移。我们没有找到令人信服的证据证明反冲黑洞携带着吸积盘。我们把反冲黑洞在类星体中的发生率的上限为4%的踢大于500公里/秒和0.35%的踢大于1000公里/秒的视线速度。

英文摘要:

Recent simulations of merging black holes with spin give recoil velocities from gravitational radiation up to several thousand km/s. A recoiling supermassive black hole can retain the inner part of its accretion disk, providing fuel for a continuing QSO phase lasting millions of years as the hole moves away from the galactic nucleus. One possible observational manifestation of a recoiling accretion disk is in QSO emission lines shifted in velocity from the host galaxy. We have examined QSOs from the Sloan Digital Sky Survey with broad emission lines substantially shifted relative to the narrow lines. We find no convincing evidence for recoiling black holes carrying accretion disks. We place an upper limit on the incidence of recoiling black holes in QSOs of 4% for kicks greater than 500 km/s and 0.35% for kicks greater than 1000 km/s line-of-sight velocity.

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