All-Stokes Survey of OH Masers in Star Forming Regions: Search for Possible Zeeman Splitting

Astronomy and Astrophysics – Astronomy

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Scientific paper

A survey was made of OH masers in known star forming regions able to be seen from the Arecibo sky with the intent of (1) refining source positions and (2) looking for sources with potential Zeeman splitting. Future VLBI follow up observations of these sources will allow the determination of the magnetic field strength of the regions. Of 22 observed sources, eleven indicated possible Zeeman splitting. Further, an OH maser was discovered near a known methanol maser, 40.2-0.2m, and its position was determined. The maser 40.2-0.2m was found to be a possible source of Zeeman splitting. These observations were the first all-stokes spectral line observations made of these sources and as a byproduct a routine was developed in IDL for the reduction and calibration of Arecibo all-stokes data.

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