High resolution observations of 6.7-GHz methanol masers with the LBA

Details High resolution observations of 6.7-GHz methanol masers with the LBA High resolution observations of 6.7-GHz methanol masers with the LBA

2004-03-18

arxiv.org/abs/astro-ph/0403430v1

Mon.Not.Roy.Astron.Soc. 351 (2004) 779

Astronomy and Astrophysics

Astrophysics

Accepted in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07844.x

We have used the Australian Long Baseline Array (LBA) to produce milliarcsecond images of five sites of methanol maser emission at 6.7 GHz. These are all sites that have linear morphologies at arcsecond resolutions, which have been hypothesised to be due to the masers forming in edge-on circumstellar disks. We find that a simple disk model cannot explain the observations. We discuss various alternatives, and suggest a new model which explains how linear velocity gradients can be produced in methanol masers that arise in planar shocks propagating nearly perpendicular to the line of sight.

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