A New 3D Maser Code Applied to Flaring Events

Malcolm Gray, L Mason, Sandra Etoka

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    Abstract

    We set out the theory and discretization scheme for a new finite-element computer code, written specifically for the simulation of maser sources. The code was used to compute fractional inversions at each node of a 3-D domain for a range of optical thicknesses. Saturation behaviour of the nodes with regard to location and optical depth were broadly as expected. We have demonstrated via formal solutions of the radiative transfer equation that the apparent size of the model maser cloud decreases as expected with optical depth as viewed by a distant observer. Simulations of rotation of the cloud allowed the construction of light-curves for a number of observable quantities. Rotation of the model cloud may be a reasonable model for quasi-periodic variability, but cannot explain periodic flaring.
    Original languageEnglish
    Pages (from-to)2628-2639
    Number of pages12
    JournalRoyal Astronomical Society. Monthly Notices
    Volume477
    Issue number2
    Early online date3 Mar 2018
    DOIs
    Publication statusPublished - 21 Jun 2018

    Keywords

    • ISM: lines and bands
    • Masers
    • Radiation mechanisms: general
    • Radiative transfer
    • Radio lines: general
    • Techniques: high angular resolution

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