冷却粒子分布产生的同步辐射
Synchrotron Emission from Cooled Particle Distributions
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中文总结 AI 辅助
研究冷却粒子分布产生的同步辐射，通过推导解析表达式扩展“局部”处理，考虑注入幂律和热电子分布函数的情况，得出发射和吸收系数的解析拟合函数，用于多种天体物理源的同步辐射余辉建模。
中文摘要 AI 辅助
同步辐射电子可通过辐射损失（如同步辐射或逆康普顿冷却）和绝热膨胀等各种过程失去能量（“冷却”）。这种冷却会使电子在能量空间中移动，改变电子分布函数，进而改变这些电子的同步辐射和吸收性质。以往通常用简化的单区框架或数值方法处理。本文通过推导解析表达式扩展了“局部”处理，比以前的数值方法更准确且计算效率更高。考虑注入幂律和热电子分布函数的具体情况，推导了包括冷却效应的发射和吸收系数的解析拟合函数，可用于多种天体物理源的同步辐射余辉建模。
英文摘要
Synchrotron emitting electrons can lose energy (`cool') through various processes including radiative losses (e.g., synchrotron or inverse-Compton cooling) and adiabatic expansion. Such cooling will shift electrons in energy-space and therefore change the electron distribution function. This in turn alters the nature of synchrotron emission and absorption from these electrons. In past literature these effects have typically been considered using either simplified one-zone frameworks, or using numerical methods as part of more accurate local modeling. In this work we extend the latter `local' treatment by deriving analytic expressions that are both accurate and more computationally efficient than previous numerical approaches. Considering two concrete cases of injected power-law and thermal electron distribution functions, we derive analytic fitting functions for the resulting emission and absorption coefficients including the effects of cooling. These fitting functions can be applied to synchrotron afterglow modeling from a variety of astrophysical sources, such as gamma-ray bursts (GRBs), luminous fast blue optical transients (LFBOTs), and jetted tidal disruption events (TDEs).
