Measuring and modelling the cosmic spectral energy distribution

Stephen Kent Andrews

    Research output: ThesisDoctoral Thesis

    121 Downloads (Pure)


    We present spectral measurements of the energy output of the Universe over the last 7.5 billion years. We find that total energy output declines from (5.1 ±1.0) to (1.3±0.3)x10^35 W Mpc^3, the Universe has become more transparent, and recover (68±12)% and (61 ±13)% of the present-day cosmic optical and infrared backgrounds. We also present a model that predicts how cosmic background radiation evolves from the Big Bang, reproducing our measurements, the extragalactic background light and the densities of stars and cosmic dust. We find a state-of-the-art model of galaxy evolution is able to reproduce our measured spectra, but underestimates its normalisation.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    • The University of Western Australia
    • Davies, Luke, Supervisor
    • Robotham, Aaron, Supervisor
    • Driver, Simon, Supervisor
    Thesis sponsors
    Award date31 Oct 2017
    Publication statusUnpublished - 2017


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