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A&A 480, 767-773 (2008)
DOI: 10.1051/0004-6361:20078670
First VLBI observations of methanol maser polarisation, in G339.88-1.26
R. DodsonObservatorio Astronómico Nacional, Apartado 112, Alcala de Henares 28803, Spain
e-mail: r.dodson@oan.es
(Received 14 September 2007 / Accepted 21 December 2007)
Abstract
Aims.We
investigate class II methanol masers and the environment in which they
form with the Long
Baseline Array (LBA).
Methods.Using full polarisation VLBI, we were 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.
Results.We present polarised images of the methanol maser source G339.88-1.26,
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.
Key words: techniques: polarimetric -- masers -- radio lines: stars -- stars: formation -- stars: individual: G339.88-1.26
© ESO 2008