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Spectra of Maser Radiation from a Turbulent, Circumnuclear Accretion Disk. III. Circular Polarization

Calculations are performed for the circular polarization of maser radiation from a turbulent, Keplerian disk intended to represent the subparsec disk at the nucleus of the galaxy NGC 4258. The polarization in the calculations is a result of the Zeeman effect when the Zeeman splitting is much less than the spectral line breadth. Plausible configurations for turbulent magnetic and velocity fields in the disk are created by statistical methods. This turbulence, the Keplerian velocity gradients, and the blending of the three hyperfine components to form the 616-523 masing transition of water are key ingredients in determining the appearance of the calculated polarized spectra. These spectra are quite different from the polarized spectra that would be expected for a two-level transition where there is no hyperfine structure. The effect of the hyperfine structure on the polarization is most striking in the calculations for the maser emission that represents the central (or systemic) features of NGC 4258. Information about magnetic fields is inferred from observations for polarized maser radiation and bears on the structure of accretion disks.