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High-resolution observations of 6.7-GHz methanol masers with the Long Baseline Array
journal contributionposted on 2023-05-16, 15:17 authored by Dodson, R, Ojha, R, Simon EllingsenSimon Ellingsen
We have used the Australian Long Baseline Array (LBA) to produce milliarcsecond images of five sites of methanol (CH3OH) maser emission at 6.7 GHz. These are all sites that have linear morphologies at arcsecond resolutions, which have been hypothesized to be due to the masers forming in edge-on circumstellar discs. We find that a simple disc model cannot explain the observations. We discuss various alternatives, and suggest a new model that explains how linear velocity gradients can be produced in methanol masers that arise in planar shocks propagating nearly perpendicular to the line of sight.
Publication titleMonthly Notices of the Royal Astronomical Society
Department/SchoolSchool of Natural Sciences
PublisherBlackwell Publishing Ltd
Place of publicationOxford, UK