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    The host galaxy of a fast radio burst

    239193_239193.pdf (3.740Mb)
    Access Status
    Open access
    Authors
    Keane, E.
    Johnston, S.
    Bhandari, S.
    Barr, E.
    Bhat, N.
    Burgay, M.
    Caleb, M.
    Flynn, C.
    Jameson, A.
    Kramer, M.
    Petroff, E.
    Possenti, A.
    Van Straten, W.
    Bailes, M.
    Burke-Spolaor, S.
    Eatough, R.
    Stappers, B.
    Totani, T.
    Honma, M.
    Furusawa, H.
    Hattori, T.
    Morokuma, T.
    Niino, Y.
    Sugai, H.
    Terai, T.
    Tominaga, N.
    Yamasaki, S.
    Yasuda, N.
    Allen, R.
    Cooke, J.
    Jencson, J.
    Kasliwal, M.
    Kaplan, D.
    Tingay, Steven
    Williams, A.
    Wayth, Randall
    Chandra, P.
    Perrodin, D.
    Berezina, M.
    Mickaliger, M.
    Bassa, C.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Keane, E. and Johnston, S. and Bhandari, S. and Barr, E. and Bhat, N. and Burgay, M. and Caleb, M. et al. 2016. The host galaxy of a fast radio burst. Nature. 530 (7591): pp. 453-456.
    Source Title
    Nature
    DOI
    10.1038/nature17140
    ISSN
    0028-0836
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/44362
    Collection
    • Curtin Research Publications
    Abstract

    In recent years, millisecond-duration radio signals originating in distant galaxies appear to have been discovered in the so-called fast radio bursts. These signals are dispersed according to a precise physical law and this dispersion is a key observable quantity, which, in tandem with a redshift measurement, can be used for fundamental physical investigations. Every fast radio burst has a dispersion measurement, but none before now have had a redshift measurement, because of the difficulty in pinpointing their celestial coordinates. Here we report the discovery of a fast radio burst and the identification of a fading radio transient lasting ~6 days after the event, which we use to identify the host galaxy; we measure the galaxy's redshift to be z = 0.492 ± 0.008. The dispersion measure and redshift, in combination, provide a direct measurement of the cosmic density of ionized baryons in the intergalactic medium of Ω IGM = 4.9 ± 1.3 per cent, in agreement with the expectation from the Wilkinson Microwave Anisotropy Probe, and including all of the so-called 'missing baryons'. The ~6-day radio transient is largely consistent with the radio afterglow of a short γ-ray burst, and its existence and timescale do not support progenitor models such as giant pulses from pulsars, and supernovae. This contrasts with the interpretation of another recently discovered fast radio burst, suggesting that there are at least two classes of bursts.

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