Propagation Effects in Magnetized Transrelativistic Plasmas
| Autor: | Roman V. Shcherbakov |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Physics
Linear polarization Astrophysics (astro-ph) Cyclotron FOS: Physical sciences Astronomy and Astrophysics Plasma Astrophysics Polarization (waves) Physics - Plasma Physics law.invention Computational physics Magnetic field Plasma Physics (physics.plasm-ph) symbols.namesake Physics::Plasma Physics Space and Planetary Science law Faraday effect Radiative transfer symbols Faraday cage |
| Zdroj: | The Astrophysical Journal. 688:695-700 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/592326 |
| Popis: | The transfer of polarized radiation in magnetized and non-magnetized relativistic plasmas is an area of research with numerous flaws and gaps. The present paper is aimed at filling some gaps and eliminating the flaws. Starting from a Trubnikov's linear response tensor for a vacuum wave with ${\bf k}=\omega/c$ in thermal plasma, the analytic expression for the dielectric tensor is found in the limit of high frequencies. The Faraday rotation and Faraday conversion measures are computed in their first orders in the ratio of the cyclotron frequency $\Omega_0$ to the observed frequency $\omega$. The computed temperature dependencies of propagation effects bridge the known non-relativistic and ultra-relativistic limiting formulas. The fitting expressions are found for high temperatures, where the higher orders in $\Omega_0/\omega$ cannot be neglected. The plasma eigenmodes are found to become linearly polarized at much larger temperatures than thought before. The results are applied to the diagnostics of the hot ISM, hot accretion flows, and jets. Comment: 7 pages, 7 figures, accepted by ApJ |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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