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

Abstract

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 $\sim 10^5$ sec after the burst trigger. If the ambient matter is dense enough with density larger than $\sim 10^{-2}$ cm${}^{-3}$, then the peak radio flux is $\sim 0.1$ 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 $\sim 0.1$ 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.

8 pages, 2 figures, Progress of Theoretical and Experimental Physics (PTEP), 2016, 051E01

References in corpus (3)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• The Physics of Gamma-Ray Bursts and Relativistic Jets
• Gamma-Ray Bursts: Progress, Problems & Prospects

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