过量的GeV辐射和cosmic ray来源
Excess GeV radiation and cosmic ray origin
摘要：
最近EGRET对弥漫的银河系伽马射线辐射的观测揭示了一个光谱，这个光谱与在整个银河系局部测量的宇宙射线光谱的假设是不相容的：1 GeV以上的光谱，其中的辐射被认为是由π ^0衰变主导的，比从局部宇宙射线质子光谱得到的光谱更难。我们表明，在宇宙射线核子的SNR起源的情况下，这部分伽马射线过剩可能是由于在这些对象的光谱指数的分散。在全局平均中，就像伽马射线视线积分一样，这种色散导致合成谱的正曲率，从而导致修正的π ^0衰变伽马射线谱。
英文摘要：
Recent EGRET observations of the diffuse Galactic gamma-ray emission reveal a spectrum which is incompatible with the assumption that the cosmic ray spectra measured locally hold throughout the Galaxy: the spectrum above 1 GeV, where the emission is supposedly dominated by pi^0-decay, is harder than that derived from the local cosmic ray proton spectrum. We demonstrate that in case of a SNR origin of cosmic ray nucleons part of this gamma-ray excess may be attributed to the dispersion of the spectral indices in these objects. In global averages, as are gamma-ray line-of-sight integrals, this dispersion leads to a positive curvature in the composite spectrum, and hence to modified pi^0-decay gamma-ray spectra.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
