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arXiv 0904.2654astro-ph.CO
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半人马座A中VHE γ射线的发现

Discovery of VHE gamma-rays from Centaurus A

M. Raue, J. -P. Lenain, F. A. Aharonian, Y. Becherini, C. Boisson, A. -C. Clapson, L. Costamante, L. Gerard, C. Medina, M. de Naurois, M. Punch, F. Rieger, H. S… 展开作者

M. Raue, J. -P. Lenain, F. A. Aharonian, Y. Becherini, C. Boisson, A. -C. Clapson, L. Costamante, L. Gerard, C. Medina, M. de Naurois, M. Punch, F. Rieger, H. Sol, L. Stawarz, A. Zech

备注：
4 pages, 3 figures, submitted as proceeding to the 44th Recontre de Moriond "Very High Energy Phenomena in the Universe", contains an updated SED including the recent Fermi data
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摘要：

我们报告了在用H.E.S.S.进行的深空观测中发现的射电星系Centaurus A的微弱甚高能量（VHE，E > 100 GeV）伽马射线辐射。实验从包括射电核心和内部KPC喷流的区域检测到具有5.0 σ统计显著性的信号。在能量阈值~250 GeV以上的积分通量被测量为蟹状星云通量的0.8%，光谱可以用幂律描述，光子指数为2.7 +/- 0.5_stat +/- 0.2_sys。在数据集中没有检测到显著的通量变化。半人马座A VHE伽马射线辐射的发现揭示了源中的粒子加速到>TeV的能量，并与M 87一起建立了射电星系作为VHE辐射源的类别。

英文摘要：

We report the discovery of faint very high energy (VHE, E > 100 GeV) gamma-ray emission from the radio galaxy Centaurus A in deep observations performed with the H.E.S.S. experiment. A signal with a statistical significance of 5.0 sigma is detected from the region including the radio core and the inner kpc jets. The integral flux above an energy threshold of ~250 GeV is measured to be 0.8% of the flux of the Crab Nebula and the spectrum can be described by a power law with a photon index of 2.7 +/- 0.5_stat +/- 0.2_sys. No significant flux variability is detected in the data set. The discovery of VHE gamma-ray emission from Centaurus A reveals particle acceleration in the source to >TeV energies and, together with M 87, establishes radio galaxies as a class of VHE emitters.

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