用分层喷流模型模拟TeV blazar的时间依赖性
Time dependent modelisation of TeV blazars by a stratified jet model
摘要：
提出了一个新的含时非均匀喷流非热耀变体模型。超相对论轻子注入喷流底部并沿喷流传播，我们假设连续的再加速和冷却，产生相对论准麦克斯韦（或“堆积”）粒子能量分布。计算了每个高度的同步加速器和同步加速器-自康普顿喷流发射率。Klein-Nishina效应以及固有的γ-γ吸收被包括在计算中。由于电子对产生光学深度的存在，粒子密度会显著增加，特别是在耀斑期间.通过改变粒子注入量，可以计算出随时间变化的喷流发射，但由于电子对产生过程的敏感性，在耀斑期间只需要很小的注入密度变化.分层的射流排放，加上堆积分布，允许显着降低散装洛伦兹因子，相比单区模型。将该模型应用于PKS 2155-304及其2006年观测到的TeV级大耀斑，可以同时再现该源从射电到TeV级的平均宽带谱，以及体洛伦兹因子小于15的TeV级耀斑的光变曲线。
英文摘要：
We present a new time-dependent inhomogeneous jet model of non-thermal blazar emission. Ultra-relativistic leptons are injected at the base of a jet and propagate along it. We assume continuous reacceleration and cooling, producing a relativistic quasi-maxwellian (or "pile-up") particle energy distribution. The synchrotron and Synchrotron-Self Compton jet emissivity are computed at each altitude. Klein-Nishina effects as well as intrinsic gamma-gamma absorption are included in the computation. Due to the pair production optical depth, considerable particle density enhancement can occur, particularly during flaring states.Time-dependent jet emission can be computed by varying the particle injection, but due to the sensitivity of pair production process, only small variations of the injected density are required during the flares. The stratification of the jet emission, together with a pile-up distribution, allows significantly lower bulk Lorentz factors, compared to one-zone models. Applying this model to the case of PKS 2155-304 and its big TeV flare observed in 2006, we can reproduce simultaneously the average broad band spectrum of this source from radio to TeV, as well as TeV light curve of the flare with bulk Lorentz factor lower than 15.
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