The magnetic field of the Milky Way: OH maser Zeeman results
We report on observations with the VLA designed to map precisely the OH maser emission from many interstellar OH sources. The primary purpose of these observations is to locate oppositely polarized Zeeman-pairs and measure the strength and line-of-sight orientation of the magnetic field in the masing regions. The magnetic fields of interstellar OH masers appear to be of Galactic origin and can be used to map the global structure of the magnetic field of the Milky Way. Measurements of the line-of-sight direction of the magnetic field for 34 OH maser sources favor axi-symmetric (over bi-symmetric models of the magnetic field of the Milky Way.
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