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Photospheric thermal radiation from GRB collapsar jets

Published online by Cambridge University Press:  05 September 2012

Akira Mizuta  and
Shigehiro Nagataki
Akira Mizuta
Affiliation:
Theory Center, Institute of Particle and Nuclear Studies, KEK (High Energy Accelerator Research Organization), 1-1 Oho, Tsukuba 305-0801, Japan email: mizuta@post.kek.jp
Shigehiro Nagataki
Affiliation:
Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502 email: nagataki@yukawa.kyoto-u.ac.jp
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Abstract

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Photospheric thermal radiation components from gamma-ray burst (GRB) jets are estimated based on relativistic hydrodynamic simulations of jet propagation. The light curves and spectra are derived, considering viewing angle effects. The light curves exhibit several seconds time variability and the luminosity is as large as that of GRB prompt emission. For observers at a viewing angle of several degrees the spectra below the peak energy are much softer than that of Planck distribution and close to typical GRB spectrum. Whereas the spectra for observers at small viewing angle are hard and close to Planck distribution. Numerical Amati and Yonetoku relations are reproduced.

Keywords

gamma-ray bursthydrodynamicsnumericalradiation mechanisms: thermal
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S279: Death of Massive Stars: Supernovae and Gamma-Ray Bursts , April 2011 , pp. 355 - 356
Copyright
Copyright © International Astronomical Union 2012

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