亚秒差距尺度喷流中脊鞘层辐射相互作用和来自M87的TeV发射
Spine-sheath layer radiative interplay in subparsec-scale jets and the TeV emission from M87
摘要：
简单的单区均匀同步辐射自康普顿模型在解释射电星系M87中观测到的TeV辐射时有严重的困难。TeV发射区的位置也不确定：它可能是靠近核的未解析喷流，类似于对耀变体的建议，或者是一个活跃的结，称为HST-1，几十秒差距。我们探讨了M87的TeV辐射产生于错位亚pc尺度喷流的可能性。我们的建模基于结构化射流，其快速脊柱被较慢的层包围。在这种情况下，负责TeV辐射发射的主要站点是层，而（去波束）脊柱占从无线电到GeV波段的发射：因此，我们预计与TeV分量的相关性比在一个区域的情况下预期的更复杂，其中两个分量都是由同一区域产生的。从小角度观察，脊柱将占主导地位的发射，与整体光谱能量分布接近BL Lac对象的同步峰值位于低能量（LBL）。
英文摘要：
Simple one-zone homogeneous synchrotron self-Compton models have severe difficulties in explaining the TeV emission observed in the radiogalaxy M87. Also the site of the TeV emission region is uncertain: it could be the unresolved jet close to the nucleus, analogously to what proposed for blazars, or an active knot, called HST-1, tens of parsec away. We explore the possibility that the TeV emission of M87 is produced in the misaligned subpc scale jet. We base our modelling on a structured jet, with a fast spine surrounded by a slower layer. In this context the main site responsible for the emission of the TeV radiation is the layer, while the (debeamed) spine accounts for the emission from the radio to the GeV band: therefore we expect a more complex correlation with the TeV component than that expected in one-zone scenarios, in which both components are produced by the same region. Observed from small angles, the spine would dominate the emission, with an overall Spectral Energy Distribution close to those of BL Lac objects with a synchrotron peak located at low energy (LBLs).
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