Title: Seed Photon Fields of Blazars in the Internal Shock Scenario Show Chinese title

Title: BLAZAR的内部激波情景中的种子光子场

Abstract: We extend our approach of modeling spectral energy distribution (SED) and lightcurves of blazars to include external Compton (EC) emission due to inverse Compton scattering of an external anisotropic target radiation field. We describe the time-dependent impact of such seed photon fields on the evolution of multifrequency emission and spectral variability of blazars using a multi-zone time-dependent leptonic jet model, with radiation feedback, in the internal shock model scenario. We calculate accurate EC-scattered high-energy spectra produced by relativistic electrons throughout the Thomson and Klein-Nishina regimes. We explore the effects of varying the contribution of (1) a thermal Shakura-Sunyaev accretion disk, (2) a spherically symmetric shell of broad-line clouds, the broad line region (BLR), and (3) a hot infrared emitting dusty torus (DT), on the resultant seed photon fields. We let the system evolve to beyond the BLR and within the DT and study the manifestation of the varying target photon fields on the simulated SED and lightcurves of a typical blazar. The calculations of broadband spectra include effects of gamma-gamma absorption as gamma-rays propagate through the photon pool present inside the jet due to synchrotron and inverse Compton processes, but neglect gamma-gamma absorption by the BLR and DT photon fields outside the jet. Thus, our account of gamma-gamma absorption is a lower limit to this effect. Here, we focus on studying the impact of parameters relevant for EC processes on high-energy (HE) emission of blazars. Show Chinese abstract

Abstract: 我们扩展了建模耀变体的光谱能量分布（SED）和光变曲线的方法，以包括由于逆康普顿散射外部各向异性目标辐射场而产生的外部康普顿（EC）辐射。 我们描述了这种种子光子场在内部激波模型情景下，通过具有辐射反馈的多区时间依赖性轻子喷流模型，对多频段辐射和耀变体光谱变化演化的时间依赖影响。 我们计算了相对论电子在整个汤姆森和克莱因-尼什纳区域产生的准确EC散射高能谱。 我们探讨了（1）热 Shakura-Sunyaev 吸积盘、（2）球对称的宽线云壳层，即宽线区（BLR），以及（3）热红外发射尘埃环（DT）的贡献变化对最终种子光子场的影响。 我们让系统演进到BLR之外并在DT之内，并研究变化的目标光子场在典型耀变体模拟SED和光变曲线中的表现。 宽带谱的计算包括伽马-伽马吸收效应，因为伽马射线在喷流内部由于同步辐射和逆康普顿过程存在的光子池中传播时会受到影响，但忽略了BLR和DT外部喷流的光子场引起的伽马-伽马吸收。 因此，我们对伽马-伽马吸收的描述是该效应的下限。 在此，我们专注于研究与EC过程相关的参数对耀变体高能（HE）辐射的影响。