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arXiv 1602.05050astro-ph.HE
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与双黑洞并合事件GW150914相符合的Gamma-Ray发射电磁余辉

Electromagnetic Afterglows Associated with Gamma-Ray Emission Coincident with Binary Black Hole Merger Event GW150914

Ryo Yamazaki, Katsuaki Asano, Yutaka Ohira

摘要:

费米伽马射线暴监测器报告说,可能探测到伽马射线对应的双黑洞合并事件,GW 150914。我们表明,γ射线发射是由相对论外流与洛伦兹因子大于10。随后,碎片外流推动周围气体形成激波,这是造成余辉同步辐射的原因。我们发现,1.4 GHz的无线电流量峰值在$\sim10^5$秒后爆发触发。如果周围的物质密度大于$\sim10^{-2}$ cm $^{-3}$,那么最大的射电通量就是$\sim0.1$ mJy,这可以用射电望远镜(如甚大射电望远镜阵)探测到。光学余辉的峰值比射电要早,如果周围的物质密度大于$\sim0.1$ cm $^{-3}$,那么光通量就可以用大型望远镜(如斯巴鲁超级超级相机)探测到。为了揭示与双黑洞合并事件相关的外流及其伽马射线发射的目前未知机制,对余辉的后续电磁观测是重要的。对余辉的探测将定位引力波和伽马射线发射的天空位置,并将支持它们之间的物理联系。

英文摘要:

The Fermi Gamma-ray Burst Monitor reported the possible detection of the gamma-ray counterpart of a binary black hole merger event, GW150914. We show that the gamma-ray emission is caused by a relativistic outflow with Lorentz factor larger than 10. Subsequently, debris outflow pushes the ambient gas to form a shock, which is responsible for the afterglow synchrotron emission. We find that the 1.4 GHz radio flux peaks at $\sim10^5$ sec after the burst trigger. If the ambient matter is dense enough with density larger than $\sim10^{-2}$ cm$^{-3}$, then the peak radio flux is $\sim0.1$ mJy, which is detectable with radio telescopes such as the Very Large Array. The optical afterglow peaks earlier than the radio, and if the ambient matter density is larger than $\sim0.1$ cm$^{-3}$, the optical flux is detectable with large telescopes such as the Subaru Hyper Suprime-Cam. To reveal the currently unknown mechanisms of the outflow and its gamma-ray emission associated with the binary black hole merger event, follow-up electromagnetic observations of afterglows are important. Detection of the afterglow will localize the sky position of the gravitational wave and the gamma-ray emissions, and it will support the physical association between them.

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