耀变体1ES 1959+650中光学偏振的特殊行为：喷流磁场和几何结构的作用
Peculiar Behavior of Optical Polarization in Blazar 1ES 1959+650: Role of Jet Magnetic Field and Geometry
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中文总结 AI 辅助
研究耀变体1ES 1959+650十年光学光变曲线，探究喷流磁场在其线性偏振特殊行为中的作用。通过螺旋磁场、横向激波及湍流发射多区模型，解释了光变曲线与偏振度的关系。
中文摘要 AI 辅助
对耀变体的高度光学偏振测量为喷流中相对论性轻子的光学薄同步辐射提供了有力证据，这表明发射区域存在部分有序磁场。然而，耀变体喷流内的磁场拓扑结构和电子加速到超相对论能量的情况尚不清楚。在这项工作中，我们研究了著名耀变体1ES 1959+650长达十年的光学光变曲线，以探究喷流磁场在500 - 700纳米波段高度变化的线性偏振特殊行为中的作用。V和R波段的光学光变曲线显示出强烈的耀斑，而同期线性偏振度没有显著变化。然而，线性偏振度分别与耀斑前后时期测量的V和R波段通量呈现出强正相关和负相关/反相关。这可以在相对论喷流方向适度变化的框架下，用螺旋磁场和横向激波得到满意解释。在耀斑期间，分数线性偏振由湍流发射多区模型解释。
英文摘要
Measurements of high degree of optical polarization from blazars provide a strong evidence for the optically thin synchrotron radiation from the relativistic leptons in the jet. This in turn characterizes the presence of a partially ordered magnetic field in the emission region. However, the topology of magnetic field and acceleration of electrons to ultrarelativistic energies within the blazar jet are poorly understood. In this work, we investigate the decade long optical light curve of the well-known blazar 1ES 1959+650 to probe the role of jet magnetic field in the peculiar behavior of the highly varying degree of linear polarization in the wavelength band 500- 700 nm. The optical light curves in V and R-bands exhibit a strong flare without any significant change in the contemporaneous degree of linear polarization. However, the degree of linear polarization shows strong positive and negative/anti-correlations with the V and R-band fluxes measured during the epochs before and after the flare, respectively. This can be satisfactorily explained using the helical magnetic field and transverse shock under the framework of a relativistic jet with modestly varying orientations. During the flare, the fractional linear polarization is explained by the turbulent emission multi-zone model.
