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arXiv 1104.4836astro-ph.HE
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费米大面阵望远镜探测暗加速器HESS J1745-303

Exploring the dark accelerator HESS J1745-303 with Fermi Large Area Telescope

C. Y. Hui, E. M. H. Wu, J. H. K. Wu, R. H. H. Huang, K. S. Cheng, P. H. T. Tam, A. K. H. Kong

摘要:

本文利用费米γ射线空间望远镜对HESS J1745-303进行了29个月的观测,在1-20 GeV和10-20 GeV的能量范围内,分别在~18-sigma和~6-sigma水平上观测到了γ射线源。与康普顿伽玛射线天文台的观测结果不同,我们没有发现任何变化的证据。发现10-20 GeV的大部分发射与HESS J1745-303的C区一致。一个简单的幂律就足以描述光子指数为~2.6的GeV能谱。在GeV制度推断的幂律谱可以连接到HESS J1745-303在1-10 TeV的一个特定的空间分量,没有任何光谱中断。这些性质为理解这种“暗粒子加速器“的性质施加了独立的约束。

英文摘要:

We present a detailed analysis of the gamma-ray emission from HESS J1745-303 with the data obtained by the Fermi Gamma-ray Space Telescope in the first ~29 months observation.The source can be clearly detected at the level of ~18-sigma and ~6-sigma in 1-20 GeV and 10-20 GeV respectively. Different from the results obtained by the Compton Gamma-ray Observatory, we do not find any evidence of variability. Most of emission in 10-20 GeV is found to coincide with the region C of HESS J1745-303. A simple power-law is sufficient to describe the GeV spectrum with a photon index of ~2.6. The power-law spectrum inferred in the GeV regime can be connected to that of a particular spatial component of HESS J1745-303 in 1-10 TeV without any spectral break. These properties impose independent constraints for understanding the nature of this "dark particle accelerator".

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。

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