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    On the Electron Energy Distribution Index of Swift Gamma-ray Burst Afterglows

    Access Status
    Fulltext not available
    Authors
    Curran, Peter
    Evans, P.
    De Pasqualea, M.
    Page, M.
    van der Horst, A.
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Curran, P. and Evans, P. and De Pasqualea, M. and Page, M. and van der Horst, A. 2010. On the Electron Energy Distribution Index of Swift Gamma-ray Burst Afterglows. The Astrophysical Journal Letters. 716: pp. L135-L139.
    Source Title
    The Astrophysical Journal Letters
    Additional URLs
    http://iopscience.iop.org/2041-8205/716/2/L135/pdf/apjl_716_2_135.pdf
    ISSN
    2041-8205
    URI
    http://hdl.handle.net/20.500.11937/38025
    Collection
    • Curtin Research Publications
    Abstract

    The electron energy distribution index, p, is a fundamental parameter of the synchrotron emission from a rangeof astronomical sources. Here we examine one such source of synchrotron emission, gamma-ray burst (GRB)afterglows observed by the Swift satellite. Within the framework of the blast wave model, we examine theconstraints placed on the distribution of p by the observed X-ray spectral indices and parameterize the distribution.We find that the observed distribution of spectral indices are inconsistent with an underlying distribution ofp composed of a single discrete value but consistent with a Gaussian distribution centered at p = 2.36 andhaving a width of 0.59. Furthermore, accepting that the underlying distribution is a Gaussian, we find that themajority ( 94%) of GRB afterglows in our sample have cooling break frequencies less than the X-ray frequency.

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