论文标题
二进制合并的祖先黑洞GW190521
Ancestral Black Holes of Binary Merger GW190521
论文作者
论文摘要
GW190521是迄今为止Ligo/Pirgo发现的最庞大的黑洞合并，质量与恒星进化模型保持紧张。对如此沉重的黑洞的一个可能的解释是，它们本身就是以前较轻的黑洞合并的残余物。在这里，我们估计GW190521的祖先黑洞的质量，假设它是以前的合并的最终产物。我们发现，最重的父母黑洞的质量为$ 62^{+21} _ { - 19} $ M $ _ \ odot $（90％可信度）。我们发现78％的概率是在$ 50 $ M $ _ \ odot-1220 $ m $ _ \ odot $质量差距中，这表明它也可能是以前合并的最终产品。因此，我们还计算了GW190521的“祖父母”黑洞的预期质量分布，假设它们存在。祖先的黑洞质量可以代表一个额外的拼图，以识别Ligo/处女座/Kagra最重的黑洞的起源。
GW190521 was the most massive black hole merger discovered by LIGO/Virgo so far, with masses in tension with stellar evolution models. A possible explanation of such heavy black holes is that they themselves are the remnants of previous mergers of lighter black holes. Here we estimate the masses of the ancestral black holes of GW190521, assuming it is the end product of previous mergers. We find that the heaviest parental black holes has a mass of $62^{+21}_{-19}$ M$_\odot$ (90% credible level). We find 78% probability that it is in the $50$ M$_\odot-120$ M$_\odot$ mass gap, indicating that it may also be the end product of a previous merger. We therefore also compute the expected mass distributions of the "grandparent" black holes of GW190521, assuming they existed. Ancestral black hole masses could represent an additional puzzle piece in identifying the origin of LIGO/Virgo/KAGRA's heaviest black holes.
