A Model of Polarisation Rotations in Blazars from Kink Instabilities in Relativistic Jets
A Model of Polarisation Rotations in Blazars from Kink Instabilities in Relativistic Jets
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相对论喷流扭结不稳定性引起的耀变体偏振旋转模型
DOI：
10.3390/galaxies5040064
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
K. Nalewajko
中科院分区：
文献类型：
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作者：
K. Nalewajko
本文提出一个简单的耀变体光学薄喷流偏振旋转模型。该模型是基于螺旋（扭结）模式的电流驱动的不稳定性的发展。一个可能的解释，建议在耀变体的偏振旋转和光学/伽马射线耀斑之间的观测连接，如果电流驱动的模式触发的长期增加的总喷流功率。证明了固有去极化在限制相干偏振旋转振幅中的重要性。因此，偏振旋转幅度是非常敏感的视角，这似乎是不一致的观测估计的视角耀变体显示偏振旋转。总的来说，用电流驱动的扭结模式来解释耀变体中的大振幅偏振旋转存在严重的障碍。
This paper presents a simple model of polarisation rotation in optically thin relativistic jets of blazars. The model is based on the development of helical (kink) mode of current-driven instability. A possible explanation is suggested for the observational connection between polarisation rotations and optical/gamma-ray flares in blazars, if the current-driven modes are triggered by secular increases of the total jet power. The importance of intrinsic depolarisation in limiting the amplitude of coherent polarisation rotations is demonstrated. The polarisation rotation amplitude is thus very sensitive to the viewing angle, which appears to be inconsistent with the observational estimates of viewing angles in blazars showing polarisation rotations. Overall, there are serious obstacles to explaining large-amplitude polarisation rotations in blazars in terms of current-driven kink modes.