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.
|Qualification||Doctor of Philosophy|
|Award date||31 Oct 2017|
|Publication status||Unpublished - 2017|