论文标题
注意差距：GW190521作为跨二进制
Minding the gap: GW190521 as a straddling binary
论文作者
论文摘要
恒星进化的黑洞（BH）形成模型可靠地预测了成对稳定的超新星（PISN）质量间隙在$ \ sim50 $到$ \ sim120 $ solar Mose的范围内。这一理论预测得到了Ligo/Virgo的前两个观察跑的二进制黑洞（BBH）的支持，其组件的质量符合功率定律，其最大质量截止值为$ _ \ mathrm {max} = 40.8^{+11.8^{+11.8} _ {-4.4} _ {-4.4} _ {-4.4} _ { - {-4.4} \ odot $ $ $ odot。同时，BBH事件GW190521的主要质量为$ m_1 = 85^{+21} _ { - 14} \，m_ \ odot $，高于推断的$ M_ \ M_ \ mathrm {max max} $，septimart Mass $ $ m_2 = 66^= 66^= 66^{+17} $ 18}我们并没有得出结论，GW190521的两个组成部分都属于大量BHS的新人群，而是探索了GW190521的次要质量属于以前观察到的BHS人群的保守情况。我们在$ M_1 $和$ M_2 $上替换默认先验，假定BH检测器构群均匀分布，并且该人口具有$ M_2 $的先验，找到$ m_2 <48 \，M_ \ odot $，以90 \％的可信度为90 \％。此外，由于系统的总质量比单个质量更好地限制了，因此$ m_2 $的人口自动增加了$ m_1 $的$ m_1 $，以sit \ emph {上面} gap（39 \％$ _1> 120> 120 \，m_ \ odot $，或25 \％的概率，或$ m_1> 130> 130> 130> \ \ \ \ \ \ \ \ \ \ \ y \ ocy。只要Double-Mass间隙BBH的先前赔率小于$ \ sim 1：15 $，GW190521就会更有可能跨越配对的差距。我们认为GW190521可能是跨二进制黑洞的第一个例子，该黑洞由常规的恒星质量BH和来自PISN质量间隙的``远侧''的BH组成。
Models for black hole (BH) formation from stellar evolution robustly predict the existence of a pair-instability supernova (PISN) mass gap in the range $\sim50$ to $\sim120$ solar masses. This theoretical prediction is supported by the binary black holes (BBHs) of LIGO/Virgo's first two observing runs, whose component masses are well-fit by a power law with a maximum mass cutoff at $m_\mathrm{max}=40.8^{+11.8}_{-4.4}\,M_\odot$. Meanwhile, the BBH event GW190521 has a reported primary mass of $m_1=85^{+21}_{-14}\,M_\odot$, firmly above the inferred $m_\mathrm{max}$, and secondary mass $m_2=66^{+17}_{-18}\,M_\odot$. Rather than concluding that both components of GW190521 belong to a new population of mass-gap BHs, we explore the conservative scenario in which GW190521's secondary mass belongs to the previously-observed population of BHs. We replace the default priors on $m_1$ and $m_2$, which assume that BH detector-frame masses are uniformly distributed, with this population-informed prior on $m_2$, finding $m_2<48\,M_\odot$ at 90\% credibility. Moreover, because the total mass of the system is better constrained than the individual masses, the population prior on $m_2$ automatically increases the inferred $m_1$ to sit \emph{above} the gap (39\% for $m_1 > 120\,M_\odot$, or 25\% probability for $m_1>130\,M_\odot$). As long as the prior odds for a double-mass-gap BBH are smaller than $\sim 1:15$, it is more likely that GW190521 straddles the pair-instability gap. We argue that GW190521 may be the first example of a straddling binary black hole, composed of a conventional stellar mass BH and a BH from the ``far side' of the PISN mass gap.
