Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-04-22
Mon.Not.Roy.Astron.Soc.269:L41,1994
Astronomy and Astrophysics
Astrophysics
5 pages, plain TeX
Scientific paper
Sudden collapse of a compact object, or coalescence of a compact binary, can generate an unsteady relativistic wind that lasts for a few seconds. The wind is likely to carry a high magnetic field; and its Lorentz factor depends on the extent to which it is 'loaded' with baryons. If the Lorentz factor is $\sim 100$, internal dissipation and shocks in this wind produce a non-thermal gamma-ray burst, detectable in the range $0.1\MeV \siml E_\gamma \siml 0.1-1\GeV$ out to cosmological distances. The cooled wind ejecta would subsequently be decelerated by the external medium. The resultant blast wave and reverse shock can then give rise to a second burst component, mainly detectable in the GeV range, with a time delay relative to the MeV burst ranging from minutes to hours.
Meszaros Peter
Rees Martin J.
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