2007年12年周期耀斑期间通过OJ 287甚高能Gamma-ray的射电多波长观测
Multiwavelength observation from radio through very-high-energy Gamma-ray of OJ 287 during the 12-year cycle flare in 2007
摘要：
2007年，我们用Nobeyama毫米波阵列进行了OJ 287的同时多波长观测，Kanata望远镜和KVA望远镜进行了光学观测，朱雀卫星进行了X射线观测，MAGIC望远镜进行了甚高能伽马射线观测。观测是在4月的静止状态和11 - 12月的耀斑状态下进行的。我们清楚地观察到，在耀斑状态期间，从射电到X射线波段的通量增加，而MAGIC无法检测到来自源的显著VHE伽马射线发射。我们可以从大约41.2小时的MAGIC观测中得出蟹状星云通量超过150 GeV的上限（95%置信水平）为1.7%。一个简单的SSC模型表明，观测到的耀斑活动可能是由电子布居分布的演变引起的，而不是由射流中的磁场强度或多普勒波束因子的变化引起的。
英文摘要：
We performed simultaneous multiwavelength observations of OJ 287 with the Nobeyama Millimeter Array for radio, the KANATA telescope and the KVA telescope for optical, the Suzaku satellite for X-ray and the MAGIC telescope for very high energy (VHE) gamma-ray in 2007. The observations were conducted for a quiescent state in April and in a flaring state in November-December. We clearly observed increase of fluxes from radio to X-ray bands during the flaring state while MAGIC could not detect significant VHE gamma-ray emission from the source. We could derive an upper limit (95% confidence level) of 1.7% of the Crab Nebula flux above 150 GeV from about 41.2 hours of the MAGIC observation. A simple SSC model suggests that the observed flaring activity could be caused by evolutions in the distribution of the electron population rather than changes of the magnetic field strength or Doppler beaming factor in the jet.
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