期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 887, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ab59e1
关键词
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资金
- JSPS Research Fellowship
- KAKENHI [18H01213, 18H01215, 17H06357, 17H06362, 17H06131, 18H01245, 18H01246, 19K14712]
- Fermi GI program [111180]
- NSF [PHY-1620777, AST-1908689]
- Alfred P. Sloan Foundation
- Eberly Foundation
- Grants-in-Aid for Scientific Research [19K14712] Funding Source: KAKEN
We investigate prolonged engine activities of short gamma-ray bursts (SGRBs), such as extended and/or plateau emissions, as high-energy gamma-ray counterparts to gravitational waves (GWs). Binary neutron-star mergers lead to relativistic jets and merger ejecta with r-process nucleosynthesis, which are observed as SGRBs and kilonovae/macronovae, respectively. Long-term relativistic jets may be launched by the merger remnant as hinted in X-ray light curves of some SGRBs. The prolonged jets may dissipate their kinetic energy within the radius of the cocoon formed by the jet-ejecta interaction. Then the cocoon supplies seed photons to nonthermal electrons accelerated at the dissipation region, causing high-energy gamma-ray production through the inverse Compton scattering process. We numerically calculate high-energy gamma-ray spectra in such a system using a one-zone and steady-state approximation, and show that GeV-TeV gamma-rays are produced with a duration of 10(2)-10(5) s. They can be detected by Fermi/LAT or CTA as gamma-ray counterparts to GWs.
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