arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.11866astro-ph.HEgr-qc
收藏

不平等的起源:30+ 10 Msun双星黑洞合并的孤立形成

The Origin of inequality: isolated formation of a 30+10Msun binary black-hole merger

A. Olejak, M. Fishbach, K. Belczynski, D. E. Holz, J. -P. Lasota, M. C. Miller, T. Bulik

摘要:

LIGO/Virgo合作报告了GW 190412的探测,这是一个BH-BH合并,迄今为止质量最不相等:24.4-34.7 Msun和7.4-10.1 Msun(质量比q=0.21-0.41)。此外,GW 190412的有效自旋估计为Xeff=0.14-0.34,而主BH的自旋范围为a=0.17-0.59。基于这一点和先前的检测,大约10%的BH-BH合并具有q<0.4。主要的BH-BH形成通道往往会产生质量相当的BH-BH合并(通常q>0.5)。在这里,我们测试是否可以产生类似于GW 190412合并的经典孤立的二进制演化通道。我们表明,我们的标准二进制演化的情况下,与典型的假设输入物理,我们在过去使用,产生这样的合并(质量和自旋)。对于这一输入物理模型,局域宇宙(z=0)中BH-BH合并的总速率密度为:73.5 Gpc^-3 yr^-1,而对于q<0.41的系统,速率密度为:6.8 Gpc^-3 yr^-1。由于GW 190412显示了一些不对准自旋的弱证据,我们在我们的模型中提供了进动参数的分布,并得出结论,如果在新的LIGO/Virgo探测中,系统进动的证据是强有力的,并且超过10%的BH-BH合并具有大的面内自旋分量(Xp>0.5),那么可以排除共同的包络孤立的二元BH-BH形成通道作为它们的起源。

英文摘要:

The LIGO/Virgo collaboration has reported the detection of GW190412, a BH-BH merger with the most unequal masses to date: 24.4-34.7 Msun and 7.4-10.1 Msun (a mass ratio of q=0.21-0.41). Additionally, GW190412's effective spin was estimated to be Xeff=0.14-0.34, with the spin of the primary BH in the range a=0.17-0.59. Based on this and prior detections, about 10 percent of BH-BH mergers have q<0.4. Major BH-BH formation channels tend to produce BH-BH mergers with comparable masses (typically with q>0.5). Here we test whether the classical isolated binary evolution channel can produce mergers resembling GW190412. We show that our standard binary evolution scenario, with the typical assumptions on input physics we have used in the past, produces such mergers (masses and spins). For this particular model of the input physics the overall BH-BH merger rate density in the local Universe (z=0) is: 73.5 Gpc^-3 yr^-1, while for systems with q<0.41 the rate density is: 6.8 Gpc^-3 yr^-1. As GW190412 shows some weak evidence for misaligned spins, we provide distribution of precession parameter in our models and conclude that if among the new LIGO/Virgo detections the evidence of system precession is strong and more than 10 percent of BH-BH mergers have large in-plane spin components (Xp>0.5) then common envelope isolated binary BH-BH formation channel can be excluded as their origin.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑