Gamma-ray emission from the solar halo and disk: a study with EGRET data
Gamma-ray emission from the solar halo and disk: a study with EGRET data
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日晕和盘的伽马射线发射：利用 EGRET 数据进行的研究
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
A. Strong
中科院分区：
文献类型：
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作者：
E. Orlando;A. Strong
语境。最近，人们预测太阳是伽马射线发射的扩展源，伽马射线发射是由宇宙射线（CR）电子在太阳辐射场上的逆康普顿（IC）散射产生的。即使在距太阳的角距离较大的情况下，预计发射也会延长，并且对于弥漫的河外背景来说，前景会令人困惑。太阳盘也有望成为稳定的伽马射线源。虽然 GLAST 预计未来可以轻松检测到这些排放，但现有 EGRET 数据的情况更具挑战性。目标。详细给出了银河CR电子在太阳辐射场上IC散射产生伽马射线的理论。这被用作使用 EGRET 数据进行检测和模型验证的基础。方法。我们使用 EGRET 数据库对太阳辐射进行了详细研究，解释了 3C 279、月球和其他来源的辐射对太阳辐射的干扰。对 2 个能量范围（300 MeV 以上和 100−300 MeV）以及组合进行分析以改进检测统计数据。该技术在月球信号上进行了测试，我们的结果与之前的工作一致。结果。通过分析 EGRET 数据库，我们找到了太阳盘及其光晕发射的证据。将观察结果与我们的扩展发射模型进行比较。获得了太阳盘发射光谱和扩展发射光谱。还给出了月球的光谱。结论。观测到的强度分布和通量与来自太阳周围光晕的 IC 伽马射线的预测模型一致。
Context. The Sun has recently been predicted to be an extended source of gamma-ray emission, produced by inverse-Compton (IC) scattering of cosmic-ray (CR) electrons on the solar radiation field. The emission was predicted to be extended and a confusing foreground for the diffuse extragalactic background even at large angular distances from the Sun. The solar disk is also expected to be a steady gamma-ray source. While these emissions are expected to be readily detectable in the future by GLAST, the situation for available EGRET data is more challenging. Aims. The theory of gamma-ray emission from IC scattering on the solar radiation field by Galactic CR electrons is given in detail. This is used as the basis for detection and model verification using EGRET data. Methods. We present a detailed study of the solar emission using the EGRET database, accounting for the effect of the emission from 3C 279, the moon, and other sources, which interfere with the solar emission. The analysis was performed for 2 energy ranges, above 300 MeV and for 100−300 MeV, as well as for the combination to improve the detection statistics. The technique was tested on the moon signal, with our results consistent with previous work. Results. Analyzing the EGRET database, we find evidence of emission from the solar disk and its halo. The observations are compared with our model for the extended emission. The spectrum of the solar disk emission and the spectrum of the extended emission have been obtained. The spectrum of the moon is also given. Conclusions. The observed intensity distribution and the flux are consistent with the predicted model of IC gamma-rays from the halo around the Sun.