Constraining Stellar-mass Black Hole Mergers in AGN Disks Detectable with LIGO
Constraining Stellar-mass Black Hole Mergers in AGN Disks Detectable with LIGO
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DOI：
10.3847/1538-4357/aadae5
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
B. McKernan;K. Ford;J. Bellovary;N. Leigh;Z. Haiman;B. Kocsis;W. Lyra;M. M. Low-M.;B. Metzger
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文献类型：
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作者：
B. McKernan;K. Ford;J. Bellovary;N. Leigh;Z. Haiman;B. Kocsis;W. Lyra;M. M. Low-M.;B. Metzger
激光干涉引力波天文台（LIGO）可以探测到的黑洞（BH）合并可以发生在活动星系核（AGN）盘中。在这里，我们参数化的合并率，质量谱，并在活动星系核盘的BH的自旋谱。预测的合并速率范围为10−3-104 Gpc−1 yr−1，因此LIGO的上限（<212 Gpc−1 yr−1）已经限制了它。预测的质谱具有破幂律的形式，由预先存在的BH幂律质谱和合并产生的更硬的幂律质谱组成。预测的自旋谱是多峰的逆行自旋BH在气体盘的演变起着关键作用。我们概述了这个通道的每个LIGO观测值的大的不确定性，我们讨论了在未来可以约束它们的方法。
Black hole (BH) mergers detectable with the Laser Interferometer Gravitational-wave Observatory (LIGO) can occur in active galactic nucleus (AGN) disks. Here we parameterize the merger rates, the mass spectrum, and the spin spectrum of BHs in AGN disks. The predicted merger rate spans ∼10−3–104 Gpc−1 yr−1, so upper limits from LIGO (<212 Gpc−1 yr−1) already constrain it. The predicted mass spectrum has the form of a broken power law, consisting of a pre-existing BH power-law mass spectrum and a harder power-law mass spectrum resulting from mergers. The predicted spin spectrum is multipeaked with the evolution of retrograde spin BHs in the gas disk playing a key role. We outline the large uncertainties in each of these LIGO observables for this channel and we discuss ways in which they can be constrained in the future.