Methanol Maser Polarization in W3(OH)

Abstract

We present the first 6.7 GHz methanol maser linear polarization map of the extended filamentary maser structure around the compact HII 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, taking into account external Faraday rotation toward W3(OH), and confirm that the OH and methanol masers are found in similar physical conditions. Additionally we discuss the Zeeman splitting of the 6.7 GHz methanol transition and present an upper limit of ~22 mG for the magnetic field strength in the maser region. The upper limit is fully consistent with the field strengths derived from OH maser Zeeman splitting.

5 pages, 2 figures, accepted for publication in MNRAS

References in corpus (1)

• Full-Polarization Observations of OH Masers in Massive Star-Forming Regions: II. Maser Properties and the Interpretation of Polarization

Cited by in corpus (5)

• A new probe of magnetic fields during high-mass star formation: Zeeman splitting of 6.7 GHz methanol masers
• A MERLIN Study of 6 GHz Excited-state OH & 6.7 GHz Methanol Masers in ON1
• First VLBI observations of methanol maser polarisation, in G339.88-1.2
• First images of 6.7-GHz methanol masers in DR21(OH) and DR21(OH)N
• A Review of Maser Polarization and Magnetic Fields