Polarization of Astronomical Maser Radiation. IV. Circular Polarization Profiles

Details Polarization of Astronomical Maser Radiation. IV. Circular Polarization Profiles Polarization of Astronomical Maser Radiation. IV. Circular Polarization Profiles

1998-04-03

arxiv.org/abs/astro-ph/9804040v1

Astronomy and Astrophysics

Astrophysics

14 pages, 1 Postscript figures (included), uses aaspp4.sty. To appear in Astrophysical Journal

Scientific paper

10.1086/306076

Profile comparison of the Stokes parameters $V$ and $I$ is a powerful tool for maser data analysis, providing the first direct methods for unambiguous determination of (1) the maser saturation stage, (2) the amplification optical depth and intrinsic Doppler width of unsaturated masers, and (3) the comparative magnitudes of Zeeman splitting and Doppler linewidth. Circular polarization recently detected in OH 1720 MHz emission from the Galactic center appears to provide the first direct evidence for maser saturation.

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