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arXiv 1708.09402astro-ph.HE
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LIGO视界内的双黑洞合并:统计性质和探测电磁对应物的前景

Binary Black Hole Mergers within the LIGO Horizon: Statistical Properties and prospects for detecting Electromagnetic Counterparts

Rosalba Perna, Martyna Chruslinska, Alessandra Corsi, Krzysztof Belczynski

摘要:

双黑洞是孤立双黑洞演化的终点之一,它们的合并是引力波事件的主要通道。在这里,使用进化代码\textsc{StarTrack},我们研究了一系列的祖星金属丰度和BH出生踢从孤立的二进制进化的BBH人口的统计特性。本文计算了双星演化过程中质量吸积引起的黑洞初始自旋$a$的质量函数和分布,发现这不是一个有效的黑洞自旋提升过程,对于很低的黑洞初始自旋,最多只能增加$a\sim$ ~0.2--0.3。我们进一步计算合并网站的主机星系内的分布,跟踪后的运动的双星的潜力,一个巨大的螺旋,一个巨大的椭圆形,和矮星系。我们发现,大质量星系中70- 90%的合并和矮星系中40- 60%的合并(范围主要对出生踢敏感)预计发生在它们的宿主内部。在合并地点的数密度分布进一步允许我们估计BBH合并将产生的宽带光度分布,\textit{if}与流出中的动能释放相关,{作为参考,我们假设在\textit{Fermi} GBM对应于GW 150914的推断水平,应理解,来自O 1和O2运行的电流限制将要求在$\lesssim 50^\circ$内的角尺寸的射流内产生这种发射。

英文摘要:

Binary black holes (BBHs) are one of the endpoints of isolated binary evolution, and their mergers a leading channel for gravitational wave events. Here, using the evolutionary code \textsc{StarTrack}, we study the statistical properties of the BBH population from isolated binary evolution for a range of progenitor star metallicities and BH natal kicks. We compute the mass function and the distribution of the primary BH spin $a$ as a result of mass accretion during the binary evolution, and find that this is not an efficient process to spin up BHs, producing an increase by at most $a\sim$~0.2--0.3 for very low natal BH spins. We further compute the distribution of merger sites within the host galaxy, after tracking the motion of the binaries in the potentials of a massive spiral, a massive elliptical, and a dwarf galaxy. We find that a fraction of 70-90\% of mergers in massive galaxies and of 40-60\% in dwarfs (range mostly sensitive to the natal kicks) is expected to occur inside of their hosts. The number density distribution at the merger sites further allows us to estimate the broadband luminosity distribution that BBH mergers would produce, \textit{if} associated with a kinetic energy release in an outflow, {which, as a reference, we assume at the level inferred for the \textit{Fermi} GBM counterpart to GW150914, with the understanding that current limits from the O1 and O2 runs would require such emission to be produced within a jet of angular size within $\lesssim 50^\circ$.}

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。

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