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    Average radio spectral energy distribution of highly star-forming galaxies

    74768.pdf (672.0Kb)
    Access Status
    Open access
    Authors
    Tisanic, K.
    Smolcic, V.
    Delhaize, J.
    Novak, M.
    Intema, Hubertus
    Delvecchio, I.
    Schinnerer, E.
    Zamorani, G.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Tisanic, K. and Smolcic, V. and Delhaize, J. and Novak, M. and Intema, H. and Delvecchio, I. and Schinnerer, E. et al. 2017. Average radio spectral energy distribution of highly star-forming galaxies. Proceedings of the International Astronomical Union. 12 (S333): pp. 191-194.
    Source Title
    Proceedings of the International Astronomical Union
    DOI
    10.1017/S1743921318000042
    ISSN
    1743-9213
    Remarks

    This article has been published in a revised form in Proceedings of the International Astronomical Union http://doi.org/10.1017/S1743921318000042. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works

    URI
    http://hdl.handle.net/20.500.11937/74483
    Collection
    • Curtin Research Publications
    Abstract

    The infrared-radio correlation (IRRC) offers a way to assess star formation from radio emission. Multiple studies found the IRRC to decrease with increasing redshift. This may in part be due to the lack of knowledge about the possible radio spectral energy distributions (SEDs) of star-forming galaxies. We constrain the radio SED of a complete sample of highly star-forming galaxies (SFR > 100 M?/ yr) based on the VLA-COSMOS 1.4 GHz Joint and 3 GHz Large Project catalogs. We reduce archival GMRT 325 MHz and 610 MHz observations, broadening the rest-frame frequency range to 0.3-15 GHz. Employing survival analysis and fitting a double power law SED, we find that the slope steepens from a spectral index of a1 = 0.51±0.04 below 4.5 GHz to a2 = 0.98±0.07 above 4.5 GHz. Our results suggest that the use of a K-correction assuming a single power-law radio SED for star forming galaxies is likely not the root cause of the IRRC trend.

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