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arXiv 1109.5879astro-ph.CO
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2005 - 2007年期间低发射态巨射电星系M87的MAGIC观测

MAGIC observations of the giant radio galaxy M87 in a low emission state between 2005 and 2007

Karsten Berger, Dijana Dominis Prester, Fabrizio Tavecchio, Tomislav Terzić

摘要:

我们提出了一个长期的M87监测活动的结果,在非常高的能量$γ$ -射线与MAGIC-I切伦科夫望远镜。2005年至2007年期间,共收集了150小时的数据。在此期间没有发现燃烧活动。然而,我们发现在$7σ$水平上有一个明显稳定而微弱的信号。我们提出了100 GeV和2 TeV之间的频谱,这是符合一个简单的幂律与频谱指数$-2.21\pm0.21$和通量归一化(在300 GeV)的$5.4\pm1.1 \times 10^{-8} \frac{1}{\mathrm{TeV s m}^{2}}$。它很好地补充了以前公布的费米光谱,覆盖了四个数量级的能量范围内没有明显的变化,在光谱指数。

英文摘要:

We present the results of a long M87 monitoring campaign in very high energy $γ$-rays with the MAGIC-I Cherenkov telescope. A total of 150 hours of data was gathered between 2005 and 2007. No flaring activity was found during that time. Nevertheless, we have found an apparently steady and weak signal at the level of $7σ$. We present the spectrum between 100 GeV and 2 TeV, which is consistent with a simple power law with a spectral index $-2.21\pm0.21$ and a flux normalization (at 300 GeV) of $5.4\pm1.1 \times 10^{-8} \frac{1}{\mathrm{TeV s m}^{2}}$. It complements well with the previously published Fermi spectrum, covering an energy range of four orders of magnitude without apparent change in the spectral index.

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