Observational studies of maser polarization
نویسندگان
چکیده
منابع مشابه
Polarization of Astronomical Maser Radiation. IV. Circular Polarization Profiles
ProÐle comparison of the Stokes parameters V and I is a powerful tool for maser data analysis, which provides the Ðrst direct methods for unambiguous determination of (1) the maser saturation stage, (2) the ampliÐcation optical depth and intrinsic Doppler width of unsaturated masers, and (3) the comparative magnitudes of Zeeman splitting and Doppler line width. Circular polarization recently de...
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We present the first 6.7 GHz methanol maser linear polarization map of the extended filamentary maser structure around the compact H region W3(OH). The methanol masers show linear polarization up to ∼ 8 per cent and the polarization angles indicate a magnetic field direction along the North-South maser structure. The polarization angles are consistent with those measured for the OH masers, ta...
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High resolution maps of maser emission provide very detailed information on processes occurring in circumstellar envelopes of late-type stars. A particularly detailed picture of the innermost shells around AGB stars is provided by SiO masers. Considerable progress is being made to provide astrometrically aligned multi-transition simultaneous observations of these masers, which are needed to bet...
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We apply the anisotropic resonant scattering model developed to explain the presence of non-Zeeman circular polarization signals recently detected in the CO (J = 2 → 1) and (J = 1 → 0) transitions in molecular clouds to Stokes V spectra of SiO v = 1 and v = 2, (J = 1 → 0) masers commonly observed in evolved stars. It is found that the observed antisymmetric “S” and symmetric “∪” or “∩” shaped s...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2002
ISSN: 0074-1809
DOI: 10.1017/s0074180900222717