2008年首次联合开展M87活动，从无线电到TeV伽马射线
A first joint M87 campaign in 2008 from radio to TeV gamma-rays
摘要：
M87是室女星系团的中心星系，是第一个在TeV范围内发现的射电星系。它的喷流结构并不指向视线，在X射线（钱德拉）、光学和无线电观测中可以进行空间分辨。TeV的流量和其他波长的发射之间的时间相关性提供了一个独特的机会，本地化非常高的能量伽马射线发射过程中发生的活动星系核。10年来，大气切伦科夫望远镜一直在TeV波段监测M87。2008年，三个主要的大气切伦科夫望远镜观测站（H.E.S.S.，MAGIC和VERITAS）在1月至5月的联合活动中协调了他们的观测，总观测时间约为10天。120小时该活动与密集的VLBA项目重叠，该项目每5天在43 GHz监测M87的核心。2月，探测到高TeV活动和快速耀斑。与此同时，M87被高空间分辨率的X射线仪器观测到（钱德拉）。我们讨论了2008年联合观察活动的结果。
英文摘要：
M87, the central galaxy of the Virgo cluster, is the first radio galaxy detected in the TeV regime. The structure of its jet, which is not pointing toward the line of sight, is spatially resolved in X-ray (by Chandra), in optical and in radio observations. Time correlation between the TeV flux and emission at other wavelengths provides a unique opportunity to localize the very high energy gamma-ray emission process occurring in AGN. For 10 years, M87 has been monitored in the TeV band by atmospheric Cherenkov telescopes. In 2008, the three main atmospheric Cherenkov telescope observatories (H.E.S.S., MAGIC and VERITAS) coordinated their observations in a joint campaign from January to May with a total observation time of approx. 120 hours. The campaign largely overlapped with an intensive VLBA project monitoring the core of M87 at 43 GHz every 5 days. In February, high TeV activities with rapid flares have been detected. Contemporaneously, M87 was observed with high spatial resolution instruments in X-rays (Chandra). We discuss the results of the joint observation campaign in 2008.
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