耀变体中喷流潜在变率的不同耗散机制
Different Jet Dissipation Mechanisms Underlying the Variability in Blazars
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中文总结 AI 辅助
研究耀变体中喷流能量耗散方式，用锥形喷流模型结合多频率分析，包括核心位移测量、光谱能量分布和功率谱密度，发现内外喷流区域耗散行为不同，可约束喷流分层和尺度相关耗散。
中文摘要 AI 辅助
耀变体是最极端的活动星系核类别之一，由相对论性喷流提供能量，但其能量耗散方式仍不清楚。本文对典型耀变体Mrk~501进行多频率分析，用锥形喷流模型模拟其核心位移测量、光谱能量分布和功率谱密度，发现内外喷流区域耗散行为不同，该方法可约束耀变体喷流分层和尺度相关耗散。
英文摘要
Blazars are among the most extreme classes of active galactic nuclei. They are powered by relativistic jets, but the way in which the jet energy is dissipated is still unclear. The flat radio spectrum and the core-shift effect trace the distributions of magnetic fields and relativistic particles along the jet, while variability carries information about time-dependent dissipation. However, a unified framework connecting these observables to the underlying jet physics has been lacking. Here we present a multi-frequency analysis of the prototypical blazar Mrk~501. We model its core-shift measurements, spectral energy distributions (SEDs), and power spectral densities (PSDs) with a conical jet model that conserves magnetic power. The core-shift data localize the radio emitting regions and constrain the electron-density and dissipation-rate profiles along the jet. With a single radial distribution of jet parameters, the model reproduces the core-shift relation and SED, but it underpredicts the observed variability at high radio frequencies and in the optical to $γ$-ray bands. We therefore introduce different blob distributions for the inner ($\lesssim$~0.1\,pc) and outer ($\gtrsim$~0.1\,pc) jet regions. With this extended model, the simulated PSDs are consistent with the multiwavelength observations of Mrk~501 during its 2017--2019 low state. This result points to different dissipation behavior in the inner and outer jet. Our study demonstrates that spectro--timing--astrometric jet modeling, which combines SEDs, multiwavelength PSDs, and radio core-shift measurements, can constrain jet stratification and scale-dependent dissipation in blazars.
