论文标题
高能带中伽马射线爆发的光谱多样性：来自湍流级联的提示
Spectral Diversities of Gamma-ray Bursts in High Energy Bands: Hints from Turbulent Cascade
论文作者
论文摘要
我们从统计上检查了通过费米GBM和费米 - 拉特观测获得的伽马射线爆发（GRB）光子指数，并将LAT GRB光子指数与GBM GRB GRB光子指数进行比较。我们应用抖动辐射来解释高能带中的GRB光谱多样性。在我们的模型中，抖动辐射光谱指数取决于湍流的光谱指数。 We classify GRBs into three classes depending on the shape of the GRB high-energy spectrum when we compare the GBM and LAT detections: the GRB spectrum is concave (GRBs turn out to be softer and are labeled as S-GRBs), the GRB spectrum is convex (GRBs turn out to be harder and are labeled as H-GRBs), and the GRBs have no strong spectral changes (labeled as N-grbs）。湍流级联中的通用kolmogorov指数7/3与N-GRB的光子指数一致。 S-Grb光谱可以通过湍流级联反应来解释，这是由于动力学重新连接，其湍流的光谱指数范围从8/3到3.0。 H-Grb光谱来自湍流级联反应，其光谱指数范围从2.0到3.5的湍流范围在大长度磁重新连接期间发生。因此，GRB辐射光谱被多样化，因为湍流级联反应改变了湍流。希望将来会有更多的观察样本进一步确定我们的建议。
We statistically examine the gamma-ray burst (GRB) photon indices obtained by the Fermi-GBM and Fermi-LAT observations and compare the LAT GRB photon indices to the GBM GRB photon indices. We apply the jitter radiation to explain the GRB spectral diversities in the high-energy bands. In our model, the jitter radiative spectral index is determined by the spectral index of the turbulence. We classify GRBs into three classes depending on the shape of the GRB high-energy spectrum when we compare the GBM and LAT detections: the GRB spectrum is concave (GRBs turn out to be softer and are labeled as S-GRBs), the GRB spectrum is convex (GRBs turn out to be harder and are labeled as H-GRBs), and the GRBs have no strong spectral changes (labeled as N-GRBs). A universal Kolmogorov index 7/3 in the turbulent cascade is consistent with the photon index of the N-GRBs. The S-GRB spectra can be explained by the turbulent cascade due to the kinetic magnetic reconnection with the spectral index range of the turbulence from 8/3 to 3.0. The H-GRB spectra originate from the inverse turbulent cascade with the spectral index range of the turbulence from 2.0 to 3.5 that occurred during the large lengthscale magnetic reconnection. Thus, the GRB radiative spectra are diversified because the turbulent cascade modifies the turbulent energy spectrum. More observational samples are expected in the future to further identify our suggestions.
