两个BL Lac天体耗散区磁场强度的约束演化
Constraining Evolution of Magnetic Field Strength in Dissipation Region of Two BL Lac Objects
摘要：
在假设BL Lac天体的光变时间尺度主要由同步辐射过程的冷却时间决定的情况下，我们估计了两个BL Lac天体的发射区随时间变化的磁场强度。的平均磁场强度是一致的，从核心移动测量和光谱能量分布模型估计。发现了耗散区磁场强度的变化。通量的变化与磁场强度之间没有明显的相关性，说明磁场的变化不是引起通量变化的主要原因。磁场强度的演化可以为约束射流中的能量耗散机制提供另一种途径。
英文摘要：
With the assumption that the optical variability timescale is dominated by the cooling time of the synchrotron process for BL Lac objects, we estimate time dependent magnetic field strength of the emission region for two BL Lac objects. The average magnetic field strengths are consistent with those estimated from core shift measurement and spectral energy distribution modelling. Variation of magnetic field strength in dissipation region is discovered. Variability of flux and magnetic field strength show no clear correlation, which indicates the variation of magnetic field is not the dominant reason of variability origin. The evolution of magnetic field strength can provide another approach to constrain the energy dissipation mechanism in jet.
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