### Abstract

We present numerical attempts of radiative transfer in a relativistic scattering flow that can produce gamma rays using a three-dimensional Monte Carlo code. We prepared an initial background flowfield obtained from hydrodynamical simulation of a relativistic jet in which Thomson scattering dominates compared to absorption, and solved the radiative transfer equation for the background evolved by a simple expansion model. Since a large number of sample particles is required for an accurate computation, we have parallelized the Monte Carlo code in order to obtain solutions in a practical computational time even for a long-term simulation coupled with a time-dependent flowfield. Using this code, higher parallel efficiency is achieved with larger number of particles. The obtained light curve from the simple model shows a signal of the transition from the opaque post-shock flow to the transparent regime as the flow expands, and the high-energy photons are generated by not only the Doppler boosting but also the inverse Compton scattering.

Original language | English |
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Pages (from-to) | 280-287 |

Number of pages | 8 |

Journal | High Energy Density Physics |

Volume | 9 |

Issue number | 2 |

DOIs | |

Publication status | Published - 2013 Jun 1 |

### Keywords

- Gamma-ray burst
- Monte Carlo method
- Radiative transfer
- Relativistic jet

### ASJC Scopus subject areas

- Radiation
- Nuclear and High Energy Physics

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## Cite this

*High Energy Density Physics*,

*9*(2), 280-287. https://doi.org/10.1016/j.hedp.2013.01.002