Journal Article

GeV emission from neutron-rich internal shocks of some long γ-ray bursts

Rong-Rong Xue, Yi-Zhong Fan and Da-Ming Wei

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 1, pages 321-324
Published in print September 2008 | ISSN: 0035-8711
Published online August 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13578.x
GeV emission from neutron-rich internal shocks of some long γ-ray bursts

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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 [T90 > 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).

Keywords: radiation mechanisms: non-thermal; ISM: jets and outflows; gamma rays: bursts

Journal Article.  2886 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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