Prompt emission spectra from the photosphere of a GRB

Details Prompt emission spectra from the photosphere of a GRB Prompt emission spectra from the photosphere of a GRB

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..924...32g&link_type=abstract

THE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS. AIP Conference Proceedings, Volume 924, pp. 32-37 (2

Computer Science

Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

I explore the observational appearance of the photosphere of an ultrarelativistic flow with internal dissipation of energy (``dissipative'' GRB model). As a case study, I use the magnetic reconnection model (AC model) that makes robust predictions on the energy dissipation rates at different radii in the flow. With analytical and numerical tools for the radiative transfer problem, I show that the flow develops a hot photosphere where inverse Compton scattering of soft photons advected with the flow leads to a spectrum with highly non-thermal appearance. For a wide range of luminosities and baryon loadings of the flow, this photospheric emission is very close to the observed prompt GRB one. The photopsheric luminosity is powerful (up to ~ 35% of the luminosity of the flow).

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