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arXiv 0811.1883astro-ph
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3C 66 B作为TeV放射性核素

3C66B as a TeV radiogalaxy

F. Tavecchio, G. Ghisellini

摘要:

MAGIC合作报告发现了一个新的VHE源,MAGIC J 0223 +430,位于blazar 3C 66 A的位置附近,长期以来一直被认为是TeV blazar的候选者。仔细的分析表明,能量在150 GeV以上的事件集中在FRI射电星系3C 66 B的位置(距离3C 66 A 6弧分),有95.4%的概率(包括系统不确定性的85.4%),该源与3C 66 A无关。我们提出了一个模型的基础上的结构射流模型已经用来解释TeV的放射性镓M87的排放的3C 66 B的可能的排放。该模型需要的参数类似于M87,但更大的光度层,占更明亮的TeV发射。我们还表明,通过MAGIC获得的光谱可以解释为3C 66 B的组合发射,占主导地位的~200 GeV,和3C 66 A。来自后一个源的高能辐射,由于与河外背景光的相互作用而被强烈衰减,只能在低能量下起作用。如果我们在小视角下看到3C 66 B的喷流发射,我们会看到光谱能量分布与典型的耀变体S5 0716+714非常相似。

英文摘要:

The MAGIC collaboration reported the detection of a new VHE source, MAGIC J0223+430, located close to the position of the blazar 3C66A, considered a candidate TeV blazar since a long time. A careful analysis showed that the events with energies above 150 GeV are centered on the position of the FRI radiogalaxy 3C66B (at 6 arcmin from 3C66A), with a probability of 95.4% (85.4% including systematic uncertainties) that the source is not related to 3C66A. We present a model for the possible emission of 3C66B based on the structured jet model already used to interpret the TeV emission of the radiogalaxy M87. The model requires parameters similar to those used for M87 but a larger luminosity for the layer, to account for the more luminous TeV emission. We also show that the spectrum obtained by MAGIC can be interpreted as the combined emission of 3C66B, dominating above ~200 GeV, and of 3C66A. The high-energy emission from the latter source, being strongly attenuated by the interaction with the extragalactic background light, can only contribute at low energies. If we were to see the jet emission of 3C 66B at small viewing angles we would see a spectral energy distribution closely resembling the one of S5 0716+714, a typical blazar.

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