Transformation Properties of External Radiation Fields, Energy-Loss Rates and Scattered Spectra, and a Model for Blazar Variability
Transformation Properties of External Radiation Fields, Energy-Loss Rates and Scattered Spectra, and a Model for Blazar Variability
复制标题
DOI：
10.1086/341431
复制
发表时间：
2002-02
期刊：
影响因子：
--
通讯作者：
C. Dermer;R. Schlickeiser
中科院分区：
文献类型：
--
作者：
C. Dermer;R. Schlickeiser
本文讨论了等离子体匀速运动时外辐射场的变换性质。在相对论外流的共动框架下，导出了各向同性和吸积盘外辐射场的比谱能量密度，如在黑洞喷流和γ射线爆发源附近发现的那些。非热电子和正电子对辐射场进行康普顿散射，高能质子和离子通过光生子和空气的产生与辐射场相互作用。我们重新审视与外部吸积盘辐射场相关的康普顿散射谱的问题，并澄清作者过去的治疗。给出了由周围各向同性单色辐射场或方位对称的几何薄吸积盘辐射场组成的环境软光子场的能量损失率和汤姆逊散射谱的简单表达式。一个模型blazar发射显示的特征光谱和变异行为，由于存在一个直接吸积盘组件。平谱射电类星体的盘状成分和明显的耀斑行为可以用GLAST探测到。耀变体的光谱状态的特征在于吸积盘和散射辐射场的相对重要性，在扩展喷流中，吸积盘，内部喷流和宇宙微波背景辐射场。
We treat transformation properties of external radiation fields in the proper frame of a plasma moving with constant speed. The specific spectral energy densities of external isotropic and accretion disk radiation fields are derived in the comoving frame of relativistic outflows, such as those thought to be found near black hole jet and gamma-ray burst sources. Nonthermal electrons and positrons Compton-scatter this radiation field, and high-energy protons and ions interact with this field through photomeson and photopair production. We revisit the problem of the Compton-scattered spectrum associated with an external accretion disk radiation field and clarify a past treatment by the authors. Simple expressions for energy-loss rates and Thomson-scattered spectra are given for ambient soft photon fields consisting of either a surrounding external isotropic monochromatic radiation field or an azimuthally symmetric, geometrically thin accretion disk radiation field. A model for blazar emission is presented that displays a characteristic spectral and variability behavior due to the presence of a direct accretion disk component. The disk component and distinct flaring behavior can be bright enough to be detected from flat-spectrum radio quasars with GLAST. Spectral states of blazars are characterized by the relative importance of the accretion disk and scattered radiation fields and, in the extended jet, by the accretion disk, inner jet, and cosmic microwave background radiation fields.