Curvature-induced Polarization and Spectral Index Behavior for PKS 1502+106
Curvature-induced Polarization and Spectral Index Behavior for PKS 1502+106
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PKS 1502 106 的曲率引起的偏振和光谱指数行为
DOI：
10.3847/1538-4357/ab3e38
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发表时间：
2019-10
期刊：
影响因子：
--
通讯作者：
Xu Chen
中科院分区：
文献类型：
--
作者：
Xi Shao;Yunguo Jiang;Xu Chen
A comprehensive study of multifrequency correlations can shed light on the nature of variation for blazars. In this work, we collect the long-term radio, optical, and γ-ray light curves of PKS 1502+106. After performing the localized cross-correlation function analysis, we find that correlations between radio and γ-ray or V band are beyond the 3σ significance level. The lag of the γ-ray relative to 15GHz is- +60 10 5 days, translating to a distance of +3 .18 0.27 0.50 parsec (pc) between them. Within uncertainties, the locations of the γ-ray and optical emitting regions are roughly the same, and are away from the jet base within 1.2pc. The derived magnetic field in optical and γ-ray emitting regions is about 0.36G. The logarithm of γ-ray flux is significantly linearly correlated with that of V-band fluxes, which can be explained by the synchrotron self-Compton process, the external Compton processes, or the combination of them. We find a significant linear correlation in the plot of log (polarization degree) versus n n Flog at V band, and use the empirical relation Π∼sinn θ′ (θ′ is the observing angle in the comoving frame blob) to explain it. The behaviors of color index (generally redder when brighter at the active state) and γ-ray spectral index (softer when brighter) could be well explained by the twisted jet model. These findings suggest that the curvature effect (mainly due to the change of the viewing angle) is dominant in the variation phenomena of fluxes, spectral indices, and polarization degrees for PKS 1502+106.
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影响因子：
64.8
作者：
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通讯作者：
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发表时间：
2009-07
影响因子：
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通讯作者：
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期刊：
The Astronomical Journal
影响因子：
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作者：
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DOI：
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发表时间：
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期刊：
arXiv: High Energy Astrophysical Phenomena
影响因子：
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作者：
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DOI：
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发表时间：
1980-01
期刊：
The Astrophysical Journal
影响因子：
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作者：
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通讯作者：
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