High-resolution observations of 6.7-GHz methanol masers with the Long Baseline Array

Richard Dodson, R. Ojha, S.P. Ellingsen

    Research output: Contribution to journalArticle

    45 Citations (Scopus)

    Abstract

    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.
    Original languageEnglish
    Pages (from-to)779-790
    JournalMonthly Notices of the Royal Astronomical Society
    Volume351
    Issue number3
    DOIs
    Publication statusPublished - 2004

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