文章基本信息

标题：Linear and circular polarization of a 1D relativistic jet model
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作者：M. Mościbrodzka
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：623
DOI：10.1051/0004-6361/201834503
语种：English
出版社：EDP Sciences
摘要：Context.Polarimetric observations of black holes allow us to probe structures of magnetic fields and plasmas in strong gravity.Aims.We present a study of the polarimetric properties of a synchrotron spectrum emitted from a relativistic jet using a low-dimensional model.Methods.A novel numerical scheme is used to integrate relativistic polarized radiative transfer equations in a slab geometry where the plasma conditions change along the integration path.Results.We find that the simple model of a non-uniform jet can recover basic observational characteristics of some astrophysical sources with a relativistic jet, such as extremely high rotation measures. Our models incorporate a time-dependent component. A small fluctuation in density or temperature of the plasma along the jet produces significant amounts of fluctuations not only in the fractional linear and circular polarizations, but also in the jet internal rotation measures.Conclusions.The low-dimensional models presented here are developed within the same computational framework as the complex three-dimensional general relativistic magnetohydrodynamics simulations of black hole disks and jets, and they offer guidance when interpreting the results from more complex polarization models. The models presented here are scalable to stationary and transient polarized radio emissions produced by relativistic plasma ejected from around compact objects, in both stellar-mass and supermassive black hole systems.
关键词：enblack hole physicsmagnetohydrodynamics (MHD)polarizationradiative transferrelativistic processes