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Polarized maser growth.

D B Melrose¹, A C Judge

¹School of Physics, University of Sydney, Sydney, NSW 2006, Australia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|December 17, 2004

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A new study shows that maser radiation in anisotropic media can become circularly polarized. This occurs when growth and Faraday rotation rates are similar, offering a new explanation for pulsar radio emission.

Area of Science:

Astrophysics
Plasma Physics
Radiophysics

Background:

Masers are crucial for understanding astrophysical emissions.
Polarization of maser radiation is sensitive to the surrounding medium.
Pulsar radio emission exhibits complex polarization patterns.

Purpose of the Study:

To investigate the polarization evolution of maser radiation in anisotropic media.
To identify new mechanisms for generating circular polarization in astrophysical masers.
To explore potential implications for pulsar radio emission.

Main Methods:

Theoretical modeling of maser propagation in anisotropic media.
Analysis of the interplay between spatial growth and generalized Faraday rotation.
Mathematical derivation of polarization changes.

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Main Results:

Maser radiation polarization differs from the maser and medium when growth and Faraday rotation rates are comparable.
Partially circularly polarized radiation emerges from a linearly polarized maser in a medium with linearly polarized natural modes.
This effect provides a novel source of circular polarization.

Conclusions:

The interaction between maser emission and anisotropic media can generate circular polarization.
This mechanism offers a new perspective on the origin of circular polarization in pulsar radio emission.
Further observational and theoretical work is needed to confirm the relevance to pulsars.