Spectrum and Duration of Delayed MeV-GeV Emission of Gamma-Ray Bursts in Cosmic Background Radiation Fields

Simple item page
dc.creatorDai, Z. G.
dc.creatorLu, T.
dc.date2002-03-06
dc.date2002-08-01
dc.date.accessioned2026-07-07T10:31:12Z
dc.date.available2026-07-07T10:31:12Z
dc.descriptionWe generally analyze prompt high-energy emission above a few hundreds of GeV due to synchrotron self-Compton scattering in internal shocks. However, such photons cannot be detected because they may collide with cosmic infrared background photons, leading to electron/positron pair production. Inverse-Compton scattering of the resulting electron/positron pairs off cosmic microwave background photons will produce delayed MeV-GeV emission, which may be much stronger than a typical high-energy afterglow in the external shock model. We expand on the Cheng & Cheng model by deriving the emission spectrum and duration in the standard fireball shock model. A typical duration of the emission is ~ 10^3 seconds, and the time-integrated scattered photon spectrum is nu^{-(p+6)/4}, where p is the index of the electron energy distribution behind internal shocks. This is slightly harder than the synchrotron photon spectrum, nu^{-(p+2)/2}. The lower energy property of the scattered photon spectrum is dependent on the spectral energy distribution of the cosmic infrared background radiation. Therefore, future observations on such delayed MeV-GeV emission and the higher-energy spectral cutoff by the Gamma-Ray Large Area Space Telescope (GLAST) would provide a probe of the cosmic infrared background radiation.
dc.description5 pages, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0203084
dc.identifierhttp://arxiv.org/abs/astro-ph/0203084
dc.identifierAstrophys.J.580:1013-1016,2002
dc.identifierdoi:10.1086/343848
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178333
dc.subjectAstrophysics
dc.titleSpectrum and Duration of Delayed MeV-GeV Emission of Gamma-Ray Bursts in Cosmic Background Radiation Fields
dc.typetext

Files

Collections

arXiv