论文标题
GW190412作为先前黑洞合并的残留物的天体物理含义
Astrophysical implications of GW190412 as a remnant of a previous black-hole merger
论文作者
论文摘要
据信，产生合并恒星质量黑洞二进制的两个主要通道被认为是田间二进制恒星的孤立演化，而恒星簇中的动态形成。第三次Ligo/处女座观察跑步（GW190412）的第一个报道的黑洞二进制事件是不寻常的，因为它具有不等的质量，无零的有效自旋和90 \％置信区间的非零主要自旋。我们表明，在田地和群集组方案的背景下，此事件应该极为罕见。将GW190412解释为以前黑洞合并的残余，为解释其特征提供了有希望的途径。如果GW190412确实从层次上形成，我们表明，从天体物理的角度（低出生的旋转和光簇）最能动机的参数空间区域无法适应观察。我们分析了公共GW190412 LIGO/处女座数据，其中有贝叶斯先验，其中更大的黑洞是由先前的合并导致的，并发现该解释得到了数据的同等支持。如果GW190412的较重组件确实是合并残留物，则其自旋幅度为$χ_1= 0.56 _ { - 0.21}^{+0.19} $，该值高于Ligo/Virgo协作的先前报告的值。
Two of the dominant channels to produce merging stellar-mass black-hole binaries are believed to be the isolated evolution of binary stars in the field and dynamical formation in star clusters. The first reported black-hole binary event from the third LIGO/Virgo observing run (GW190412) is unusual in that it has unequal masses, nonzero effective spin, and nonzero primary spin at 90\% confidence interval. We show that this event should be exceedingly rare in the context of both the field and cluster formation scenarios. Interpreting GW190412 as a remnant of a previous black-hole merger provides a promising route to explain its features. If GW190412 indeed formed hierarchically, we show that the region of the parameter space that is best motivated from an astrophysical standpoint (low natal spins and light clusters) cannot accommodate the observation. We analyze public GW190412 LIGO/Virgo data with a Bayesian prior where the more massive black hole resulted from a previous merger, and find that this interpretation is equally supported by the data. If the heavier component of GW190412 is indeed a merger remnant, then its spin magnitude is $χ_1=0.56_{-0.21}^{+0.19}$, which is higher than the value previously reported by the LIGO/Virgo collaboration.
