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    The z-DM distribution of fast radio bursts

    Access Status
    Open access
    Authors
    James, Clancy
    Prochaska, J.X.
    Macquart, Jean-Pierre
    North-Hickey, F.O.
    Bannister, K.W.
    Dunning, A.
    Date
    2022
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    James, C.W. and Prochaska, J.X. and Macquart, J.P. and North-Hickey, F.O. and Bannister, K.W. and Dunning, A. 2022. The z-DM distribution of fast radio bursts. Monthly Notices of the Royal Astronomical Society. 509 (4): pp. 4775-4802.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stab3051
    ISSN
    0035-8711
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP180100857
    http://purl.org/au-research/grants/arc/DP210102103
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/91562
    Collection
    • Curtin Research Publications
    Abstract

    We develop a sophisticated model of fast radio burst (FRB) observations, accounting for the intrinsic cosmological gas distribution and host galaxy contributions, and give the most detailed account yet of observational biases due to burst width, dispersion measure, and the exact telescope beamshape. Our results offer a significant increase in both accuracy and precision beyond those previously obtained. Using results from ASKAP and Parkes, we present our best-fitting FRB population parameters in a companion paper. Here, we consider in detail the expected and fitted distributions in redshift, dispersion measure, and signal to noise. We estimate that the unlocalized ASKAP FRBs arise from z < 0.5, with between a third and a half within z < 0.1. Our predicted source-counts ('logN-logS') distribution confirms previous indications of a steepening index near the Parkes detection threshold of 1 Jy ms. We find no evidence for a minimum FRB energy, and rule out Emin > 1039.0 erg at 90 per cent C.L. Importantly, we find that above a certain DM, observational biases cause the Macquart (DM-z) relation to become inverted, implying that the highest-DM events detected in the unlocalized Parkes and ASKAP samples are unlikely to be the most distant. More localized FRBs will be required to quantitatively estimate this effect, though its cause is a well-understood observational bias. Works assuming a 1-1 DM-z relation may therefore derive erroneous results. Our analysis of errors suggests that limiting factors in our analysis are understanding of FRB spectral behaviour, sensitivity response of search experiments, and the treatment of the repeating population and luminosity function.

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