M87与VERITAS的观察
Observation of M87 with VERITAS
摘要：
巨大的射电星系M87是唯一一个被发现为极高能量伽马射线源的河外非耀变体。它代表了一个独特的机会，研究从附近的活动星系核伽马射线发射的现象。在本文中，我们报告了2007年2月，3月和4月的成像大气切伦科夫望远镜阵列VERITAS采取的M87的观测的初步结果。超过250 GeV的能量阈值的过量的光子测量的统计意义大于5个标准偏差。
英文摘要：
The giant radio galaxy M87 is the only extragalactic non-blazar object which has been detected as a source of very high energy gamma-rays. It represents a unique opportunity to study the phenomena of gamma-ray emission from a nearby AGN. In this paper we report preliminary results from the observations of M87 taken with the imaging atmospheric Cherenkov telescope array VERITAS in February, March and April 2007. An excess of photons above an energy threshold of 250 GeV is measured with a sta tistical significance of more than five standard deviations.
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