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    Characterizing the radio continuum emission from intense starburst galaxies

    246221_246221.pdf (1.118Mb)
    Access Status
    Open access
    Authors
    Galvin, T.
    Seymour, Nick
    Filipovic, M.
    Tothill, N.
    Marvil, J.
    Drouart, G.
    Symeonidis, M.
    Huynh, M.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Galvin, T. and Seymour, N. and Filipovic, M. and Tothill, N. and Marvil, J. and Drouart, G. and Symeonidis, M. et al. 2016. Characterizing the radio continuum emission from intense starburst galaxies. Monthly Notices of the Royal Astronomical Society. 461 (1): pp. 825-838.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stw1288
    ISSN
    0035-8711
    School
    Department of Physics and Astronomy
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/19525
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.The intrinsic thermal (free-free) and non-thermal (synchrotron) emission components that comprise the radio continuum of galaxies represent unique, dust-free measures of star formation rates (SFR). Such high SFR galaxies will dominate the deepest current and future radio surveys. We disentangle the thermal and non-thermal emission components of the radio continuum of six ultraluminous infrared galaxies (LFIR > 1012.5 L?) at redshifts of 0.2 = z = 0.5 and 22 IR selected galaxies. Radio data over a wide frequency range (0.8 < ? <10 GHz) are fitted with a star-forming galaxy model comprising of thermal and non-thermal components. The luminosities of both radio continuum components are strongly correlated to the 60 µm luminosity across many orders of magnitude (consistent with the far-IR to radio correlation). We demonstrate that the spectral index of the radio continuum spectral energy distribution is a useful proxy for the thermal fraction. We also find that there is an increase in mean and scatter of the thermal fraction with FIR to radio luminosity ratio which could be influenced by different time-scales of the thermal and non-thermal emission mechanisms.

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