Abstract
The extragalactic background radiation from all galaxies permeates throughout the universe. At low frequencies (30 kHz - 300 GHz), the radio emissions accumulate over cosmological time to form a diffuse background that is similar to the Cosmic Microwave Background (CMB). This background is called the Extragalactic Radio Background (ERB). In this thesis, we present an updated estimate of the diffuse ERB at low frequencies in the kHz to GHz radio band. The new model is based on the synchrotron spectra and the source count distribution at sub-mJy levels, for normal galaxies associated with ongoing star formation and radio galaxies with active galactic nuclei (AGN), using large scale radio and infrared surveys. We model radio survey data at different redshifts using the luminosity evolution and the density evolution of galaxies. The same model is then used to calculate ERB and its evolution with cosmic time.
M.Sc.