Tuesday, April 24, 2012

1204.4881 (Yi-Zhong Fan et al.)

The photospheric radiation model for the prompt emission of Gamma-ray Bursts: Interpreting four observed correlations    [PDF]

Yi-Zhong Fan, Da-Ming Wei, Fu-Wen Zhang, Bin-Bin Zhang
We show that the experiential $E_{\rm p}-L$, $\Gamma-L$, $E_{\rm p}-\Gamma$ and ${\rm \bar{\eta}_\gamma}-E_{\rm p}$ correlations (where $L$ is the luminosity of the prompt emission, $E_{\rm p}$ is the spectral peak energy, $\Gamma$ is the bulk Lorentz factor and $\bar{\eta}_\gamma$ is the emission efficiency of Gamma-ray Burst (GRB)) are well consistent with the relations between the resembling parameters predicted in the photospheric radiation model of the prompt emission of Gamma-ray Bursts. The time-resolved thermal radiation of GRB 090902B does follow the $E_{\rm p}-L$ and $\Gamma-L$ correlations. A reliable interpretation of the four correlations in alternative models is still lack. These facts may point towards a photospheric origin of prompt emission of some Gamma-ray Bursts.
View original: http://arxiv.org/abs/1204.4881

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