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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >An emergence of a new polarized emission region in blazar Mrk 421 associated with an X-ray flare
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An emergence of a new polarized emission region in blazar Mrk 421 associated with an X-ray flare

机译：与X射线耀斑有关的Blazar Mrk 421中出现了一个新的偏振发射区域

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摘要

We report on long-term multi-wavelength monitoring of blazar Mrk 421 from 2010 to 2011. The source exhibited extreme X-ray flares in 2010. Our research group performed optical photopolarimetric follow-up observations using the Kanata telescope. In 2010, the variability in the X-ray band was significant, while the optical and ultraviolet (UV) flux decreased gradually. Polarization properties also exhibited unique variability in 2010, suggesting the presence of a systematic component of polarization and magnetic field alignment for the emergence of a new polarized emission region. In contrast, in 2011 the variability in the X-ray band was smaller, and the variability in the optical and UV bands was larger, than in 2010. To explore the reasons for these differences, spectral fitting analysis was performed via simple synchrotron self-Compton modeling; the results revealed different behaviors in terms of spectral evolution between these periods, suggesting different variabilitymechanisms between 2010 and 2011. In 2010, the radiation was likely the result of energy injection into the emitting regions with an aligned magnetic field. In contrast, in 2011 the superposition of different emission regions may have contributed to the low degree of observed polarization. It also implies that high-energy electrons which were not accelerated to ultra-relativistic velocities were injected in 2011.
机译：我们报告了2010年至2011年对blazar Mrk 421进行的长期多波长监测。该辐射源在2010年出现了极端X射线耀斑。我们的研究小组使用Kanata望远镜进行了光偏振偏振后续观察。 2010年，X射线谱带的变化很大，而光通量和紫外线通量则逐渐下降。极化特性在2010年还表现出独特的可变性，表明存在极化和磁场对准的系统性成分，以用于新的极化发射区域的出现。相比之下，与2010年相比，2011年X射线谱带的变异性较小，而光学和紫外谱带的变异性较大。为探索这些差异的原因，通过简单的同步加速器自检进行了光谱拟合分析。康普顿建模;结果揭示了这两个时期之间在频谱演化方面的不同行为，表明在2010年至2011年之间存在不同的变异性机制。2010年，辐射很可能是能量注入到具有对齐磁场的发射区域的结果。相反，在2011年，不同发射区域的叠加可能导致观测到的极化程度较低。这也意味着在2011年注入了没有加速到超相对论速度的高能电子。

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