论文标题
最不寻常的双黑洞合并的最普通的形成
The most ordinary formation of the most unusual double black hole merger
论文作者
论文摘要
Ligo/处女座的合作报告了最大的黑洞（BH -BH）合并最新的最大质量与85 MSUN和66 MSUN（GW190521）的最新合并。最近在大麦芽云中30个多拉多斯集群中大恒星观察到的动机是为了在脉冲上稳定性质量损害上采用新的不确定性，并采用新的不确定性，这可以使bhs形成bhs trivial sipitival bergial berf bective bhs the Massival berf bectiral bective bectiral nitival berg and sclient bection bectival bh bh bh bh bh没有动态相互作用或异国情调的帮助。由两个大规模（180+150 msun）人口II星（Z = 0.0001）组成的二进制，通过稳定的Roche Lobe溢出和常见的包膜发作演变。两种暴露的恒星岩心都会发生直接的核心爆发，并形成大量的BHS，同时避免了配对脉动质量损失或完全破坏。 LIGO/处女座观察表明，轻度BH-BH合并的合并速率密度（两个组件：<50 msun）的顺序为10-100 gpc^-3 yr^-1，而GW190521表示较重合并的速率为0.02-0.43 gpc^-3 yr^yr^yr^-1。我们的模型（具有有关输入物理学的标准假设），但扩展到包括200颗MSUN星星，并允许出色的核心崩溃至90 MSUN BHS的可能性产生以下速率：63 GPC^-3 Yr^-1用于轻度BH-BH合并，0.04 GPC^-3 Yr^-3 yr^-1 yr^-1。我们没有声称GW190521是由孤立的二进制组成的，但看来这种可能性不能被排除在外。
LIGO/Virgo Collaboration reported the detection of the most massive black hole - black hole (BH-BH) merger up to date with component masses of 85 Msun and 66 Msun (GW190521). Motivated by recent observations of massive stars in the 30 Doradus cluster in the Large Magellanic Cloud (>200 Msun; e.g. R136a) and employing newly estimated uncertainties on pulsational pair-instability mass-loss (that allow for possibility of forming BHs with mass up to 90Msun) we show that it is trivial to form such massive BH-BH mergers through the classical isolated binary evolution (with no assistance from either dynamical interactions or exotica). A binary consisting of two massive (180+150 Msun) Population II stars (Z=0.0001) evolves through a stable Roche lobe overflow and common envelope episode. Both exposed stellar cores undergo direct core-collapse and form massive BHs while avoiding pair-instability pulsation mass-loss or total disruption. LIGO/Virgo observations show that the merger rate density of light BH-BH mergers (both components: <50 Msun) is of the order of 10-100 Gpc^-3 yr^-1, while GW190521 indicates that the rate of heavier mergers is 0.02-0.43 Gpc^-3 yr^-1. Our model (with standard assumptions about input physics) but extended to include 200 Msun stars and allowing for the possibility of stellar cores collapsing to 90 Msun BHs produces the following rates: 63 Gpc^-3 yr^-1 for light BH-BH mergers and 0.04 Gpc^-3 yr^-1 for heavy BH-BH mergers. We do not claim that GW190521 was formed by an isolated binary, but it appears that such a possibility can not be excluded.
