On the role of strong gravity in polarization from scattering of light in relativistic flows
On the role of strong gravity in polarization from scattering of light in relativistic flows
复制标题
关于强引力在相对论流中光散射偏振中的作用
DOI：
10.1111/j.1365-2966.2005.09748.x
复制
发表时间：
2005
影响因子：
4.8
通讯作者：
V. Karas
中科院分区：
文献类型：
--
作者：
J. Horák;V. Karas
考虑到辐射阻力和中心体对粒子的引力作用，我们研究了光在粒子云上的散射引起的线偏振。通过将散射光局部偏振的Beloborodv模型与Abramowicz等人联系起来，包含了狭义相对论和广义相对论的影响。超致密恒星附近粒子运动的形式主义。中心体的致密性和光度是该模型的两个关键参数。我们讨论了光子的偏振幅度，这些光子被汤姆森散射成直接的和更高阶的图像。后者的重要性只在典型情况下是中等的，但它们可能会产生不同的特征，我们将从玩具模型的角度来探讨这些特征。散射信号表现出强度和偏振的变化，并随光束/聚焦效应和光传播时间的不同而相互滞后。
We study linear polarization due to scattering of light on a cloudlet of particles, taking into account the radiation drag and the gravitational pull exerted on them by a central body. The effects of special and general relativity are included by connecting a model of Beloborodov for the local polarization of scattered light with Abramowicz et al. formalism for the particle motion near an ultracompact star. The compactness of the central body and its luminosity are two critical parameters of the model. We discuss the polarization magnitude of photons, which are Thomson-scattered into direct and higher-order images. The importance of the latter is only moderate under typical conditions, but they may give rise to distinct features, which we explore in terms of a toy model. The scattered signal exhibits variations of intensity and of polarization with mutual time-lags depending on the beaming/focusing effects and the light traveltime.