The influence of free electrons on the evolution of circular polarization in OH masers

Statistics – Computation

Scientific paper

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Computational Astrophysics, Free Electrons, Hydroxyl Emission, Interstellar Masers, Interstellar Matter, Massive Stars, Star Formation, Stellar Evolution, Stellar Physics, Beams (Radiation), Boundary Conditions, Electron Transitions, Faraday Effect, Mathematical Models, Stellar Models

Scientific paper

A recent paper (Gray & Field 1994) has shown how amplification in a sigma-transition, and subsequent magnetic beaming, can lead to the formation of very close to 100% circularly polarized OH maser radiation, as observed in numerous massive star-forming regions. A more complete analysis is presented here, which includes effects of Faraday rotation due to the presence of free electrons in the masing medium. For the range of conditions relevant to OH masers, the Faraday effect however turns out to be of negligible importance in the mechanism by which circular polarization is generated, and Faraday effects may legitimately be ignored.

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