X-ray Rich GRB, Photospheres and Variability

Details X-ray Rich GRB, Photospheres and Variability X-ray Rich GRB, Photospheres and Variability

2002-05-09

arxiv.org/abs/astro-ph/0205144v2

Astrophys.J.578:812-817,2002

Astronomy and Astrophysics

Astrophysics

accepted in Ap.J. 6/20/02; subm 5/8/02; aaspp4, 12 pages, 1 fig

Scientific paper

10.1086/342611

We investigate the relationship between the quasi-thermal baryon-related photosphere in relativistic outflows, and the internal shocks arising outside them, which out to a limiting radius may be able to create enough pairs to extend the optically thick region. Variable gamma-ray light curves are likely to arise outside this limiting pair-forming shock radius, while X-ray excess bursts may arise from shocks occurring below it; a possible relation to X-ray flashes is discussed. This model leads to a simple physical interpretation of the observational gamma-ray variability-luminosity relation.

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