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arXiv 0707.4677astro-ph
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极端反冲对大质量黑洞双星引力波探测的影响

Extreme recoils: impact on the detection of gravitational waves from massive black hole binaries

A. Sesana

摘要:

最近对高速旋转的大质量黑洞双星(MBHB)合并的数值模拟表明,残余物可以承受几千公里/秒的反冲速度。我们在这里研究,通过专门的模拟黑洞的建立,这种极端的反冲如何影响宇宙学的合并率的MBHB,放置一个强大的下限预测数量的引力波(GW)源可检测的未来空间-承载的任务(如LISA)。我们考虑了黑洞形成的两条主要途径:一条是种子是第三星族恒星的轻残余物(~10^2 \msun),另一条是种子重得多(>~10^4 \msun),通过原始核盘中的直接气体坍缩形成。我们发现,极端的反冲速度不妥协的有效MBHB检测LISA。如果种子已经很大和/或相对稀少,检测率仅降低约15%。如果种子是轻的和丰富的,探测的数量会大幅下降(约60%),但在这种情况下,预测的聚结数量如此之高,以至于在三年的观测中至少有10个源是有保证的。

英文摘要:

Recent numerical simulations of coalescences of highly spinning massive black hole binaries (MBHBs) suggest that the remnant can suffer a recoil velocity of the order of few thousands km/s. We study here, by means of dedicated simulations of black holes build--up, how such extreme recoils could affect the cosmological coalescence rate of MBHBs, placing a robust lower limit for the predicted number of gravitational wave (GW) sources detectable by future space--borne missions (such as LISA). We consider two main routes for black hole formation: one where seeds are light remnants of Population III stars (~10^2 \msun), and one where seeds are much heavier (>~10^4 \msun), formed via the direct gas collapse in primordial nuclear disks. We find that extreme recoil velocities do not compromise the efficient MBHB detection by LISA. If seeds are already massive and/or relatively rare, the detection rate is reduced by only ~15%. The number of detections drops substantially (by ~60%) if seeds are instead light and abundant, but in this case the number of predicted coalescences is so high that at least ~10 sources in a three year observation are guaranteed.

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