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    Cyanopolyynes in hot cores: modelling G305.2+0.2

    Access Status
    Open access via publisher
    Authors
    Chapman, J.
    Millar, T.
    Wardle, M.
    Burton, M.
    Walsh, Andrew
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Chapman, J. and Millar, T. and Wardle, M. and Burton, M. and Walsh, A. 2009. Cyanopolyynes in hot cores: modelling G305.2+0.2. Monthly Notices of the Royal Astronomical Society. 394: pp. 221-230.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1365-2966.2008.14144.x
    ISSN
    0035-8711
    URI
    http://hdl.handle.net/20.500.11937/18858
    Collection
    • Curtin Research Publications
    Abstract

    We present results from a time-dependent gas-phase chemical model of a hot core based on the physical conditions of G305.2+0.2. While the cyanopolyyne HC3N has been observed in hot cores, the longer chained species, HC5N, HC7N and HC9N, have not been considered as the typical hot-core species. We present results which show that these species can be formed under hot core conditions. We discuss the important chemical reactions in this process and, in particular, show that their abundances are linked to the parent species acetylene which is evaporated from icy grain mantles. The cyanopolyynes show promise as `chemical clocks' which may aid future observations in determining the age of hot core sources. The abundance of the larger cyanopolyynes increases anddecreases over relatively short time-scales, ~102.5 yr. We present results from a non-local thermodynamic equilibrium statistical equilibrium excitation model as a series of density, temperature and column density dependent contour plots which show both the line intensities and several line ratios. These aid in the interpretation of spectral-line data, even when there is limited line informationavailable. In particular, non-detections of HC5N and HC7N in Walsh et al. are analysed and discussed.

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