Photospheres, Comptonization and X-ray Lines in Gamma Ray Bursts

Details Photospheres, Comptonization and X-ray Lines in Gamma Ray Bursts Photospheres, Comptonization and X-ray Lines in Gamma Ray Bursts

1999-12-22

arxiv.org/abs/astro-ph/9912475v1

Astronomy and Astrophysics

Astrophysics

To appear in Procs. 5th Huntsville Gamma-Ray Burst Symposium, Hunstville, AL, Oct. 18-22, 1999, 5 pages, 2 figures, aipproc.st

Scientific paper

Steep X-ray spectral slopes, X-ray excesses and preferred spectral energy breaks in the 01-0.3 MeV range are discussed as the possible consequences of the photospheric component of the GRB relativistic outflow, and of pair breakdown in internal shocks leading to comptonization on semirelativistic electrons or MHD waves. We also discuss the X-ray and UV spectra of GRB afterglows occuring in a dense environment characteristic of massive stellar progenitors, including their ability to produce detectable Fe or other metallic line features.

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