Comparison of Two Epochs of the Zeeman Effect in the 44 GHz Class I methanol (CH3OH) maser line in OMC-2

Abstract

We present a second epoch of observations of the 44 GHz Class I methanol maser line toward the star forming region OMC-2. The observations were carried out with the Very Large Array, and constitute one of the first successful Zeeman effect detections with the new WIDAR correlator. Comparing to the result of our earlier epoch of data for this region, we find that the intensity of the maser increased by 50%, but the magnetic field value has stayed the same, within the errors. This suggests that the methanol maser may be tracing the large-scale magnetic field that is not affected by the bulk gas motions or turbulence on smaller scales that is causing the change in maser intensity.

10 pages, 1 figure, accepted for publication in AJ

References in corpus (7)

• Theory of Star Formation
• Full-Polarization Observations of OH Masers in Massive Star-Forming Regions: II. Maser Properties and the Interpretation of Polarization
• Millimeter- and Submillimeter-Wave Observations of the OMC-2/3 Region. III. An Extensive Survey for Molecular Outflows
• First Interferometric Images of the 36 GHz Methanol Masers in the DR21 Complex
• Discovery of the Zeeman Effect in the 44 GHz Class I methanol maser line
• Conference Summary: The Cosmic Agitator - Magnetic Fields in the Galaxy
• Very Large Array Detection of the 36 GHz Zeeman Effect in DR21W Revisited

Cited by in corpus (6)

• Physical characteristics of bright Class I methanol masers
• Review of Zeeman Effect Observations of Regions of Star Formation
• Z45: A New 45-GHz Band Dual-Polarization HEMT Receiver for the NRO 45-m Radio Telescope
• The Zeeman Effect in the 44 GHz Class I Methanol Maser Line toward DR21(OH)
• First clear detection of the CCS Zeeman splitting toward the pre-stellar core, Taurus Molecular Cloud-1
• Long-term variability of Class I methanol masers in the high mass star forming region DR21(OH)