GeV emission from neutron-rich internal shocks of some long γ-ray bursts |
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| Authors: | Rong-Rong Xue Yi-Zhong Fan Da-Ming Wei |
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| Institution: | Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China;Graduate School, Chinese Academy of Sciences, Beijing 100039, China;Niels Bohr Institute, Niels Bohr International Academy, Blegdamsvej 17, DK-2100 Copenhagen, Denmark;Joint Center for Particle Nuclear Physics and Cosmology of Purple Mountain Observatory –Nanjing University, Nanjing 210008, China |
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| Abstract: | In the neutron-rich internal shocks model for γ-ray bursts (GRBs), the Lorentz factors (LFs) of ion shells are variable, and so are the LFs of accompanying neutron shells. For slow neutron shells with a typical LF of approximate tens, the typical β-decay radius is ～1014–1015 cm . As GRBs last long enough T 90 > 14(1 + z ) s] , one earlier but slower ejected neutron shell will be swept successively by later ejected ion shells in the range ～1013–1015 cm , where slow neutrons have decayed significantly. Part of the thermal energy released in the interaction will be given to the electrons. These accelerated electrons will mainly be cooled by the prompt soft γ-rays and give rise to GeV emission. This kind of GeV emission is particularly important for some very long GRBs and is detectable for the upcoming satellite Gamma-Ray Large Area Space Telescope (GLAST). |
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| Keywords: | radiation mechanisms: non-thermal ISM: jets and outflows gamma rays: bursts |
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