从NGC 6251的多波长观测对相对论性喷流流结构的影响
Implications for the structure of the relativistic jet from multiwavelength observations of NGC 6251
摘要：
NGC 6251是一个明亮的射电星系，距离约104 Mpc，由费米伽马射线太空望远镜发现，在此之前由EGRET（康普顿伽马射线天文台）发现。不同的观测约束有利于伽马射线发射的核起源。本文研究了NGC 6251的光谱能量分布，并给出了在单区同步加速器/SSC框架下的模拟结果。SSC模型提供了一个很好的描述无线电伽马射线发射，但对于其他未对准的来源，预测较低的洛伦兹因子（Γ~2.4）比典型的建模耀变体。如果耀变体的统一方案是正确的，这似乎表明在这些物体中至少存在两个发射区域，一个具有较高的洛伦兹因子，一个具有较低的洛伦兹因子。结构射流的解决方案，与一个快速移动的脊椎周围的一个缓慢的层，探索和后果的两个模型的射流能量学和演化进行了讨论。
英文摘要：
NGC 6251 is a luminous radio galaxy ~104 Mpc away that was detected significantly with the Fermi Gamma-ray Space Telescope, and before that with EGRET (onboard the Compton Gamma-ray Observatory). Different observational constraints favor a nuclear origin for the gamma-ray emission. Here we present a study of the spectral energy distribution (SED) of the core of NGC 6251, and give results of modeling in the one-zone synchrotron/SSC framework. The SSC model provides a good description of the radio to gamma-ray emission but, as for other misaligned sources, predicts a lower Lorentz factor (Γ~2.4) than typically found when modeling blazars. If the blazar unification scenario is correct, this seems to point to the presence of at least two emitting regions in these objects, one with a higher and one with a lower Lorentz factor. The solution of a structured jet, with a fast moving spine surrounded by a slow layer, is explored and the consequences of the two models for the jet energetics and evolution are discussed.
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