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2013MNRAS.436L..54A - Mon. Not. R. Astron. Soc., 436, L54-L58 (2013/November-3)

Comptonization of photons near the photosphere of relativistic outflows.


Abstract (from CDS):

We consider the formation of photon spectrum at the photosphere of ultrarelativistically expanding outflow. We use the Fokker-Planck approximation to the Boltzmann equation, and obtain the generalized Kompaneets equation which takes into account anisotropic distribution of photons developed near the photosphere. This equation is solved numerically for relativistic steady wind and the observed spectrum is found in agreement with previous studies. We also study the photospheric emission for different temperature dependences on radius in such outflows. In particular, we found that for Tr-2 the Band low-energy photon index of the observed spectrum is α ≃ -1, as typically observed in Gamma-Ray Bursts.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): methods: numerical - gamma-ray burst: general

Simbad objects: 12

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