MAGIC望远镜观测到的2008年初M87的强烈耀斑活动
The strong flaring activity of M87 in early 2008 as observed by the MAGIC telescope
摘要：
M87是已知的第一个发射甚高能量伽马射线的射电星系。在M87的监测计划中，MAGIC望远镜在2008年初探测到VHE伽马射线的快速耀斑。发现流量在短至1天的时间尺度上是可变的，达到350 GeV以上蟹状星云流量的15%。相比之下，在较低能量（150 GeV至350 GeV）下的通量与恒定是相容的。我们目前的光变曲线和能谱，并认为，所观察到的日尺度通量的变化有利于M87核心的伽马射线发射源，而不是明亮的已知的HST-1在喷流的M87。
英文摘要：
M87 is the first known radio galaxy to emit very high energy (VHE) gamma-rays. During a monitoring program of M87, a rapid flare in VHE gamma-rays was detected by the MAGIC telescope in early 2008. The flux was found to be variable on a timescale as short as 1 day, reaching 15% of the Crab Nebula flux above 350 GeV. In contrast, the flux at lower energies (150 GeV to 350 GeV) is compatible with being constant. We present light curves and energy spectra, and argue that the observed day-scale flux variability favours the M87 core as source of the gamma-ray emission rather than the bright know HST-1 in the jet of M87.
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