Volume 457, Number 3, October III 2006
|Page(s)||763 - 770|
|Published online||12 September 2006|
Prompt emission spectra from the photosphere of a GRB
Max Planck Institute for Astrophysics, Box 1317, 85741 Garching, Germany e-mail: firstname.lastname@example.org
Accepted: 10 July 2006
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 leads to highly non-thermal spectrum. For a wide range of luminosities and baryon loadings of the flow, this spectrum is very close to the observed prompt GRB emission. Its luminosity ranges from ~3 to 20% of that of the total energy input.
Key words: gamma rays: bursts / radiation mechanisms: general / methods: statistical
© ESO, 2006
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