Constraining evolution of magnetic field strength in the dissipation region of two BL Lac objects

• 作者: Xu-Liang Fan Da-Hai Yan Qing-Wen Wu Xu Chen
• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2021,（12）
• 页码范围: 55-60
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-4527/ac299e

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 the dissipation region is discovered.Variability of flux and magnetic field strength shows no clear correlation,which indicates the variation of magnetic field is not the dominant reason of the variability origin.The evolution of magnetic field strength can provide another approach to constrain the energy dissipation mechanism in jets.