Time-resolved GRB spectra in the complex radiation of synchrotron and Compton processes
Time-resolved GRB spectra in the complex radiation of synchrotron and Compton processes
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同步加速器和康普顿过程的复杂辐射中的时间分辨GRB光谱
DOI：
10.1093/mnras/stv2870
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发表时间：
2016
影响因子：
4.8
通讯作者：
Chang Z.
中科院分区：
文献类型：
--
作者：
Jiang Y. G.;Hu S. M.;Chen X.;Li K.;Guo D. F.;Li Y. T.;Li H. Z.;Zhao Y. Y.;Lin H. N.;Chang Z.
在稳态条件下，通过求解连续性方程，研究了同步辐射和康普顿过程复合辐射下的电子能谱。由此产生的伽玛射线暴（GRB）谱在快速和缓慢冷却阶段都是破幂律的。在此基础上，给出了四个不同相态的能带函数的谱指数。在复辐射框架下，通过对物理参数的详细研究，发现有三种模型可以回答α π −1问题，即内激波模型和外激波模型中的同步加速器加同步加速器自康普顿过程，以及外激波模型中的同步加速器加外康普顿过程。讨论了GRB 080916C中可能存在的临界到快速冷却相变。研究了GRB 100724B、GRB 100826A和GRB 130606B不同主脉冲的时间分辨谱。我们发现，在几乎所有的主脉冲的流量成正比的峰值能量。在GRB 100826A的第一个主脉冲中，Fp与Ep有显著的（5σ）相关，在GRB 100826A和GRB 130606B的主脉冲中，Fp与Ep有3个边缘显著的（3σ）相关。在GRB 100826 A的第一个主脉冲中，观测到谱指数与Epat 3 σ 4σ能级之间的相关性。这种相关性在复杂的辐射情景中得到了解释。
Under the steady-state condition, the spectrum of electrons is investigated by solving the continuity equation under the complex radiation of both the synchrotron and Compton processes. The resulted gamma-ray burst (GRB) spectrum is a broken power law in both the fast and slow cooling phases. On the basis of this electron spectrum, the spectral indices of the Band function in four different phases are presented. In the complex radiation frame, the detail investigation on physical parameters reveals that three models can answer the α ∼ −1 problem, which are the synchrotron plus synchrotron self-Compton in the internal and the external shock models, and the synchrotron plus the external Compton processes in the external shock model. A possible marginal to fast cooling phase transition in GRB 080916C is discussed. The time-resolved spectra in different main pulses of GRB 100724B, GRB 100826A and GRB 130606B are investigated. We found that the flux is proportional to the peak energy in almost all main pulses. A significant (5σ) correlation forFp∼Epis evident the first main pulse of GRB 100826A, and three marginally significant (3σ) correlationsFp∼Epare found in main pulses of GRB 100826A and GRB 130606B. The correlation between spectral index andEpat 3 ∼ 4σ level are observed in the first main pulse of GRB 100826A. Such correlations are possible explained in the complex radiation scenario.