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

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

2008-04-14

arxiv.org/abs/0804.2106v1

Astron.Astrophys.480:767,2008

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1051/0004-6361:20078670

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.

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