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arXiv 0801.1227astro-ph
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天鹅座地区的GeV-TeV $γ$ -射线弥散辐射

The diffuse GeV-TeV $γ$-ray emission of the Cygnus region

Xiao-Jun Bi, Tian-Lu Chen, Yue Wang, Qiang Yuan

摘要:

最近,米拉格罗实验在天鹅座区域观测到弥散的多TeV伽马射线发射,这比银河宇宙线模型预测的要强得多。然而,EGRET的亚GeV观测结果并没有超过基于同一模型的预测。这种TeV的过量意味着可能有高能宇宙射线存在于比地球上观测到的光谱更硬的区域。在工作中,我们详细研究了这种理论推测。我们发现,一个具有功率指数$α_p\lesssim 2.3$的扩散质子源,或一个具有功率指数$α_e\lesssim2.6$的扩散电子源可以重现Milagro的观测,而不与EGRET数据相冲突。对中微子的进一步探测,强子模型的诊断,以及硬X射线同步辐射,轻子模型的诊断,有助于打破这种简并性。结合费米几百GeV的γ射线观测,我们将能够更好地理解天鹅座区域的漫发射机制。

英文摘要:

Recently the Milagro experiment observed diffuse multi-TeV gamma-ray emission in the Cygnus region, which is significantly stronger than what predicted by the Galactic cosmic ray model. However, the sub-GeV observation by EGRET shows no excess to the prediction based on the same model. This TeV excess implies possible high energy cosmic rays populated in the region with harder spectrum than that observed on the Earth. In the work we studied this theoretical speculation in detail. We find that, a diffuse proton source with power index $α_p\lesssim 2.3$, or a diffuse electron source with power index $α_e\lesssim2.6$ can reproduce the Milagro's observation without conflicting with the EGRET data. Further detections on neutrinos, a diagnostic of the hadronic model, and hard X-ray synchrontron radiation, a diagnostic of the lepton model, help to break this degeneracy. In combination with the gamma ray observations to several hundred GeV by Fermi, we will be able to understand the diffuse emission mechanisms in the Cygnus region better.

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