Discovery of the Zeeman Effect in the 44 GHz Class I Methanol Maser Line with the EVLA

Details Discovery of the Zeeman Effect in the 44 GHz Class I Methanol Maser Line with the EVLA Discovery of the Zeeman Effect in the 44 GHz Class I Methanol Maser Line with the EVLA

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21642205m&link_type=abstract

American Astronomical Society, AAS Meeting #216, #422.05; Bulletin of the American Astronomical Society, Vol. 41, p.834

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the first detection of the Zeeman effect in the 44 GHz Class I methanol maser line. The observations were carried out with 22 antennas of the Expanded Very Large Array (EVLA) toward the star-forming region OMC-2. The detected line of sight magnetic field value is 18.4 +/- 1.1 mG toward the peak of the maser line. This magnetic field value has been derived using a Zeeman splitting factor based on laboratory measurements of the 25 GHz methanol line, since no measurements exist for the Zeeman splitting factor in the 44 GHz line. The detected field is not significantly different from the magnetic field discovered in the 36 GHz Class I methanol maser line in the massive star forming region M8E (Sarma & Momjian 2009), or from those measured in the 6.7 GHz Class II methanol maser line (Vlemmings 2008). This indicates that these masers may trace the large scale magnetic field, or that the magnetic field remains unchanged during the early evolution of star forming regions.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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