Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First VLBI observations of methanol maser polarisation, in G339.88-1.2   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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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph