论文标题
大耀斑期间电子加速和冷却的时间依赖性建模
Time dependent modeling of electron acceleration and cooling during blazar flares
论文作者
论文摘要
我们提出了一种新的与时间相关的Leptonic代码，我们开发了用于建模大黄体耀斑期间不同多波长（MWL）发射的新代码。在我们的建模中，我们假设大黄体发射起源于射流中的等离子体斑点，并且相对论电子被注入斑点，可能会经历随机（Fermi II）或冲击（FERMI I）加速度。考虑到粒子注入，逃生，加速度和辐射冷却，我们在数值上求解了斑点中电子进化的动力学方程。为了计算BLOB发射的光谱能分布（SED），我们假设同步体自compton（SSC）方案，包括同步加速器自我吸收和伽马 - 伽马吸收过程。我们的代码计算电子光谱的演变和相关的宽波段SED的演变。作为第一个应用程序，我们尝试将从Blazar MRK 421的连续稳态发射与2010年2月观察到的耀斑连接，在两区域的情况下，使用最少数量的自由参数，其中在其周围存在湍流区域。 MRK 421是一种高合格峰（HSP）BL LAC，也是非常高的能量（VHE）Gamma-ray频带中最明亮的外层状伽马射线源之一。它也是最接近地球的TEV发射的Tev（红移Z = 0.031）。
We present a new time-dependent leptonic code that we developed to model the varying multi-wavelength (MWL) emission during blazar flares. In our modeling, we assume that the blazar emission originates from a plasma blob located in the jet, and that relativistic electrons are injected into the blob and may undergo stochastic (Fermi II) or shock (Fermi I) acceleration. We numerically solve the kinetic equation for electron evolution in the blob, taking into account particle injection, escape, acceleration and radiative cooling. In order to calculate the spectral energy distribution (SED) of the blob emission we assume a synchrotron self-Compton (SSC) scenario, including also synchrotron self absorption and gamma-gamma absorption processes. Our code computes the evolution of the electron spectrum and of the associated broad-band SED. As a first application, we attempt to connect the continuous, steady-state emission from the blazar Mrk 421 with a flare observed in February 2010, using a minimal number of free parameters in a two-zone scenario in which a turbulent region is present around the emitting zone. Mrk 421 is a high-synchrotron-peaked (HSP) BL Lac, and one of the brightest extragalactic gamma-ray sources in the Very High Energy (VHE) gamma-ray band. It is also the closest TeV emitting blazar to the Earth (redshift z=0.031).
