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arXiv 2104.03081astro-ph.HEastro-ph.GA
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3C 84的详细运动学研究及其与γ射线的联系

A detailed kinematic study of 3C 84 and its connection to Gamma-rays

Jeffrey A. Hodgson, Bindu Rani, Junghwan Oh, Alan Marscher, Svetlana Jorstad, Yosuke Mizuno, Jongho Park, Sang-Sung Lee, Sascha Trippe, Florent Mertens

摘要:

3C 84(NGC 1275)是英仙座星团的明亮射电核心。即使在没有强相对论效应的情况下,该源也已在高达TeV能量的伽马射线中被检测到。尽管对它进行了深入的研究,但负责源中高能发射的物理过程仍然没有答案。我们提出了一个详细的运动学研究的源和它的连接到伽马射线发射。次秒差距尺度的射电结构主要是由缓慢移动的功能,在东部和西部车道的喷流。喷流似乎在不到125000重力半径的范围内加速到最大速度。在喷流中可靠检测到的最快速度约为0.9 c。这导致最小洛伦兹因子约为1.35。我们的分析表明,在源中存在多个高能量站点。如果伽马射线与喷流的运动学变化有关,那么它们在喷流的东部和西部通道都产生。三个伽马射线耀斑是同时期的缓慢移动的发射区分裂成两个子区域。我们估计这些事件的重要性为~2-3 σ。我们测试了我们的结果对理论预测的磁重联引起的微型射流和湍流,并发现它们兼容。

英文摘要:

3C 84 (NGC 1275) is the bright radio core of the Perseus Cluster. Even in the absence of strong relativistic effects, the source has been detected at Gamma-rays up to TeV energies. Despite its intensive study, the physical processes responsible for the high-energy emission in the source remain unanswered. We present a detailed kinematics study of the source and its connection to Gamma-ray emission. The sub-parsec scale radio structure is dominated by slow-moving features in both the eastern and western lanes of the jet. The jet appears to have accelerated to its maximum speed within less than 125 000 gravitational radii. The fastest reliably detected speed in the jet was ~0.9 c. This leads to a minimum Lorentz factor of ~1.35. Our analysis suggests the presence of multiple high-energy sites in the source. If Gamma-rays are associated with kinematic changes in the jet, they are being produced in both eastern and western lanes in the jet. Three Gamma-ray flares are contemporaneous with epochs where the slowly moving emission region splits into two sub-regions. We estimate the significance of these events being associated as ~2-3 sigma. We tested our results against theoretical predictions for magnetic reconnection-induced mini-jets and turbulence and find them compatible.

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