Measuring and modelling the cosmic spectral energy distribution

Stephen Kent Andrews

    Research output: ThesisDoctoral Thesis

    62 Downloads (Pure)

    Abstract

    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
    Thesis sponsors
    Award date31 Oct 2017
    DOIs
    Publication statusUnpublished - 2017

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    spectral energy distribution
    universe
    cosmic dust
    output
    background radiation
    dust
    galaxies
    stars
    energy

    Cite this

    @phdthesis{7a099f7858e5431ca0014198e343a861,
    title = "Measuring and modelling the cosmic spectral energy distribution",
    abstract = "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.",
    keywords = "integrated galactic light, extragalactic background light, cosmic background radiation, cosmology, Galaxy evolution",
    author = "Andrews, {Stephen Kent}",
    year = "2017",
    doi = "10.4225/23/5a02ae16692bd",
    language = "English",
    school = "The University of Western Australia",

    }

    Andrews, SK 2017, 'Measuring and modelling the cosmic spectral energy distribution', Doctor of Philosophy, The University of Western Australia. https://doi.org/10.4225/23/5a02ae16692bd

    Measuring and modelling the cosmic spectral energy distribution. / Andrews, Stephen Kent.

    2017.

    Research output: ThesisDoctoral Thesis

    TY - THES

    T1 - Measuring and modelling the cosmic spectral energy distribution

    AU - Andrews, Stephen Kent

    PY - 2017

    Y1 - 2017

    N2 - 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.

    AB - 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.

    KW - integrated galactic light

    KW - extragalactic background light

    KW - cosmic background radiation

    KW - cosmology

    KW - Galaxy evolution

    U2 - 10.4225/23/5a02ae16692bd

    DO - 10.4225/23/5a02ae16692bd

    M3 - Doctoral Thesis

    ER -