用双组分模型解释B2 1633+382的变化现象
Interpreting the variation phenomena of B2 1633+382 via the two-component model
摘要：
Blazar是一种多变的天体，其变化机制一直是一个悬而未决的问题。为了深入理解B2 1633+382（4C 38.41）的变化机理，本文对光谱指数和偏振度的变化现象进行了综合研究。我们使用局部交叉关联函数（LCCF）来进行多波长光变曲线之间的关联分析。我们发现，$γ$ -射线和光学$V$ -波段与无线电15 GHz在超过3 $σ$的置信水平。根据滞后分析，$γ$射线和光的发射区位于15 GHz无线电核心区上游的$14.2_{-2.4}^{+0}$ pc和$14.2_{-8.3}^{+8.3}$ pc处，远离宽线区（BLR）。光谱中的宽线表明辐射中存在吸积盘成分。因此，我们考虑的两个组件（TC）模型，其中包括相对恒定的背景分量和变化的射流分量来研究变化的行为。采用马尔可夫链蒙特卡罗（MCMC）方法研究了喷流和背景成分的物理参数。在一定程度上，归一化残差的研究表明，TC模型拟合比线性拟合模型更好。具有螺旋磁场的喷流有希望解释这种变化，喷流模型中的激波并没有完全排除。
英文摘要：
Blazars are variable targets in the sky, whose variation mechanism remains an open question. In this work, we make a comprehensive study on the variation phenomena of the spectral index and polarization degree (PD) to deeply understand the variation mechanism of B2 1633+382 (4C 38.41). We use the local cross-correlation function (LCCF) to perform the correlation analysis between multi-wavelength light curves. We find that both $γ$-ray and optical $V$-band are correlated with the radio 15 GHz at the beyond 3$σ$ confidence level. Based on the lag analysis, the emitting regions of $γ$-ray and optical locate at $14.2_{-2.4}^{+0}$ pc and $14.2_{-8.3}^{+8.3}$ pc upstream of the core region of radio 15 GHz, and are far away from the broad-line region (BLR). The broad lines in the spectrum indicate the existence of the accretion disk component in the radiation. Thus, we consider the two-component (TC) model, which includes the relative constant background component and the varying jet component to study the variation behaviors. The Markov Chain Monte Carlo (MCMC) procedure is adopted to study the physical parameters of the jet and the background components. To some extent, the study of normalized residuals indicates that the TC model fits better than the linear fitting model. The jet with helical magnetic field is hopeful to explain the variation, and the shock in jet model is not completely ruled out.
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