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    A novel approach for characterizing broad-band radio spectral energy distributions

    Access Status
    Fulltext not available
    Authors
    Harvey, V.
    Franzen, Thomas
    Morgan, John
    Seymour, Nick
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Harvey, V. and Franzen, T. and Morgan, J. and Seymour, N. 2018. A novel approach for characterizing broad-band radio spectral energy distributions. Monthly Notices of the Royal Astronomical Society. 476 (2): pp. 2717-2730.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/MNRAS/STY386
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/71500
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 The Authors. We present a new broad-band radio frequency catalogue across 0.12 GHz = v = 20 GHz created by combining data from the Murchison Widefield Array Commissioning Survey, the Australia Telescope 20 GHz survey, and the literature. Our catalogue consists of 1285 sources limited by S20 GHz> 40 mJy at 5s, and contains flux density measurements (or estimates) and uncertainties at 0.074, 0.080, 0.119, 0.150, 0.180, 0.408, 0.843, 1.4, 4.8, 8.6, and 20 GHz. We fit a second-order polynomial in log-log space to the spectral energy distributions of all these sources in order to characterize their broad-band emission. For the 994 sources that are well described by a linear or quadratic model we present a new diagnostic plot arranging sources by the linear and curvature terms. We demonstrate the advantages of such a plot over the traditional radio colour-colour diagram. We also present astrophysical descriptions of the sources found in each segment of this new parameter space and discuss the utility of these plots in the upcoming era of large area, deep, broad-band radio surveys.

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