arXiv 2005.010642020-05-03astro-ph.HE

致密中等质量黑洞X射线双星：潜在的LISA源？

Compact intermediate-mass black hole X-ray binaries: potential LISA sources?

Wen-Cong Chen

备注：: 6 pages, 5 figures, ApJ in press
发表信息：: Astrophysical Journal, 896:129 (2020)
DOI：: 10.3847/1538-4357/ab9017

摘要：

空间引力波（GW）探测器激光干涉仪空间天线（LISA）计划于21世纪30年代初发射，其科学目标是探测银河系中的低频引力波信号。它的主要候选GW源是白矮星和中子星的致密双星。在这项工作中，我们研究是否紧凑的中等质量黑洞（IMBH）的X射线双星可能是潜在的LISA源。我们的模拟表明，在初始轨道周期为0.77 d的分叉周期附近，具有1000 $M_{\odot}$ IMBH和3 $M_{\odot}$施主星的IMBH双星可以演化成超紧凑X射线双星，它将发射最大频率为2.5 mHz的GW信号。根据特征应变的演化轨迹，初始施主星质量为$1-3~M_{\odot}$，初始轨道周期略小于分叉周期的IMBH X射线双星在15 kpc的距离上是可以被LISA探测到的。假设银河系60个球状星团中的每一个都有1000个$M_{\odot}$ IMBH，那么LISA在银河系中探测到的紧凑IMBH X射线双星的最大数量应该少于10个。因此，LISA对致密IMBH X射线双星的探测能力并不乐观。

英文摘要：

The scientific aim of the space gravitational wave (GW) detector Laser Interferometer Space Antenna (LISA) that was scheduled to launch in the early 2030s is to detect the low-frequency GW signals in the Galaxy. Its main candidate GW sources are compact binaries of white dwarfs and neutron stars. In this work, we examine whether compact intermediate-mass black hole (IMBH) X-ray binaries could be potential LISA sources. Our simulations indicate that IMBH binary with a 1000 $M_{\odot}$ IMBH and a 3 $M_{\odot}$ donor star in an orbit of initial orbital period near the so-called bifurcation period of 0.77 d could evolve into an ultra-compact X-ray binary, which will emit GW signals with maximum frequency of 2.5 mHz. According to the evolutionary tracks of characteristic strain, IMBH X-ray binaries with the initial donor-star masses of $1-3~M_{\odot}$ and the initial orbital periods slightly less than the bifurcation periods will be detectable by the LISA in a distance of 15 kpc. Assuming each of 60 Galactic globular clusters hosts a 1000 $M_{\odot}$ IMBH, the maximum number of compact IMBH X-ray binaries that LISA will detect in the Galaxy should be less than ten. Therefore, the detectability of compact IMBH X-ray binaries by the LISA is not optimistic.

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。

摘要：

英文摘要：

相关论文