First VLBI observations of methanol maser polarisation, in G339.88-1.2

Abstract

We investigate class II methanol masers and the environment in which they form with the Long Baseline Array (LBA). Using full polarisation VLBI, we're able to measure the magnetic field directions so as to distinguish between the two main models of the environment in which methanol masers form: disks or shocks. We present polarised images of the methanol maser source G339.88-1.2, made with the LBA at 6.7-GHz. With these first polarisation maps made with the LBA, which successfully reproduce observations with the ATCA confirming the new AIPS code, a new technique for Southern VLBI is opened. The magnetic field directions found are inconstant with methanol masers arising in disks for the majority of the emission.

References in corpus (12)

• The Formation of Massive Stars from Turbulent Cores
• Massive Stars: Their Environment and Formation
• Rotation Measures of Extragalactic Sources Behind the Southern Galactic Plane: New Insights into the Large-Scale Magnetic Field of the Inner Milky Way
• Methanol Masers as Tracers of Circumstellar Disks
• Polarization of Astronomical Maser Radiation. III. Arbitrary Zeeman Splitting and Anisotropic Pumping
• Continuum emission associated with 6.7-GHz methanol masers
• High resolution observations of 6.7-GHz methanol masers with the LBA
• Methanol Maser Polarization in W3(OH)
• Ring shaped 6.7 GHz methanol maser emission around a young high-mass star
• High-Resolution Mid-Infrared Imaging of G339.88-1.26
• Intrinsic properties of the magnetically collimated water maser jet of W43A
• On the solution of the polarisation gain terms for VLBI data collected with antennas having Nasmyth or E-W mounts

Cited by in corpus (10)

• A new probe of magnetic fields during high-mass star formation: Zeeman splitting of 6.7 GHz methanol masers
• Review of Zeeman Effect Observations of Regions of Star Formation
• The structure of the magnetic field in the massive star-forming region W75N
• An Ordered Envelope-disk Transition in the Massive Protostellar Source G339.88-1.26
• First Parallax Measurements Towards a 6.7 GHz Methanol Maser with the Australian Long Baseline Array - Distance to G339.884-1.259
• Methanol masers probing the ordered magnetic field of W75N
• A Very Long Baseline Interferometry Detection of the Class I Protostar IRS 5 in Corona Australis
• Probing the magnetic fields of massive star forming regions with methanol maser polarisation
• Inverse MultiView II: Microarcsecond Trigonometric Parallaxes for Southern Hemisphere 6.7~GHz Methanol Masers G232.62+00.99 and G323.74$-$00.26
• First VLBI detection of Fornax A