Photospheric signatures imprinted on the gamma-ray burst spectra

Details Photospheric signatures imprinted on the gamma-ray burst spectra Photospheric signatures imprinted on the gamma-ray burst spectra

2005-09-08

arxiv.org/abs/astro-ph/0509232v1

Mon.Not.Roy.Astron.Soc.Lett.363:L61-L65,2005

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures; to appear in MNRAS pink pages

Scientific paper

10.1111/j.1745-3933.2005.00089.x

A solution is presented for the spectrum of high-energy gamma-ray burst photons confined to a quasi-thermal baryonic photosphere. The solution is valid in the steady-state limit assuming the region under consideration is optically thick to the continuously injected photons. It is shown that for a high luminosity photosphere, the non-thermal electrons resulting from gamma-ray Compton cooling lose their energy by upscattering the soft thermalised radiation. The resulting spectral modifications offer the possibility of diagnosing not only the burst comoving luminosity but also the baryon load of the ejecta. This model leads to a simple physical interpretation of X-ray rich bursts and anomalous low-energy slopes.

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