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    Microwave observations of spinning dust emission in NGC 6946

    Access Status
    Fulltext not available
    Authors
    Scaife, A.
    Nikolic, B.
    Green, D.
    Beck, R.
    Davies, M.
    Franzen, Thomas
    Grainge, K.
    Hobson, M.
    Hurley-Walker, Natasha
    Lasenby, A.
    Olamaie, M.
    Pooley, G.
    Rodriguez-Gonzalvez, C.
    Saunders, R.
    Scott, P.
    Shimwell, T.
    Titterington, D.
    Waldram, E.
    Zwart, J.
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Scaife, A. and Nikolic, B. and Green, D. and Beck, R. and Davies, M. and Franzen, T. and Grainge, K. et al. 2010. Microwave observations of spinning dust emission in NGC 6946. Monthly Notices of the Royal Astronomical Society: Letters. 406: pp. L45-L49.
    Source Title
    Monthly Notices of the Royal Astronomical Society: Letters
    Additional URLs
    http://mnrasl.oxfordjournals.org/content/406/1/L45.full.pdf
    ISSN
    1745-3925
    URI
    http://hdl.handle.net/20.500.11937/16893
    Collection
    • Curtin Research Publications
    Abstract

    We report new cm-wave measurements at five frequencies between 15 and 18 GHz of thecontinuum emission from the reportedly anomalous ‘region 4’ of the nearby galaxyNGC6946.We find that the emission in this frequency range is significantly in excess of that measuredat 8.5 GHz, but has a spectrum from 15 to 18 GHz consistent with optically thin free–freeemission from an ultracompact HII region. In combination with previously published data,we fit four emission models containing different continuum components using the Bayesianspectrum analysis package RADIOSPEC. These fits show that, in combination with data at otherfrequencies, a model with a spinning dust component is slightly preferred to those that possessbetter-established emission mechanisms.

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