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arXiv 1209.2658astro-ph.HEastro-ph.GAgr-qc
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天鹅座X-3:银河系双黑洞或黑洞-中子星的祖先

Cyg X-3: a Galactic double black hole or black hole-neutron star progenitor

Krzysztof Belczynski, Tomasz Bulik, Ilya Mandel, B. S. Sathyaprakash, Andrzej Zdziarski, Joanna Mikolajewska

摘要:

没有已知的双黑洞(BH-BH)或黑洞-中子星(BH-NS)系统。我们认为Cyg X-3很可能是BH-BH或BH-NS的祖先。这个银河系X射线双星由一个紧凑的物体组成,由沃尔夫-拉叶(WR)型伴星提供风力。根据对观测数据的综合分析,最近认为天鹅座X-3有一个2-4.5 Msun BH和一个7.5-14.2 Msun WR伴星。我们发现,这样一个双星的命运导致迅速(<1百万年)形成一个封闭的BH-BH系统的上限允许WR质量(M_WR>13 Msun)。对于低到中等质量的WR星(M_WR=7-10 Msun),天鹅座X-3最有可能(概率70%)在WR最终成为超新星时被破坏。然而,以较小的概率,它可能会形成一个宽(15%)或封闭(15%)的BH-NS系统。对于Cyg X-3形成通道的BH-BH系统合并,先进的LIGO/VIRGO检测率为每年10次,而BH-NS系统则下降到每年0.1次。如果天鹅座X-3实际上拥有一颗低质量的BH和大质量的WR星,那么它为BH-BH/BH-NS系统的存在提供了额外的支持。

英文摘要:

There are no known double black hole (BH-BH) or black hole-neutron star (BH-NS) systems. We argue that Cyg X-3 is a very likely BH-BH or BH-NS progenitor. This Galactic X-ray binary consists of a compact object, wind-fed by a Wolf-Rayet (WR) type companion. Based on a comprehensive analysis of observational data, it was recently argued that Cyg X-3 harbors a 2-4.5 Msun BH and a 7.5-14.2 Msun WR companion. We find that the fate of such a binary leads to the prompt (<1 Myr) formation of a close BH-BH system for the high end of the allowed WR mass (M_WR>13 Msun). For the low- to mid-mass range of the WR star (M_WR=7-10 Msun) Cyg X-3 is most likely (probability 70%) disrupted when WR ends up as a supernova. However, with smaller probability, it may form a wide (15%) or a close (15%) BH-NS system. The advanced LIGO/VIRGO detection rate for mergers of BH-BH systems from the Cyg X-3 formation channel is 10 per year, while it drops down to 0.1 per year for BH-NS systems. If Cyg X-3 in fact hosts a low mass BH and massive WR star, it lends additional support for the existence of BH-BH/BH-NS systems.

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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