Modeling the extragalactic gamma-ray background at Fermi-LAT energies

The extragalactic gamma-ray background is the result of the combined emission of numerous galaxies, high-energy astrophysical mechanisms, and unresolved galactic sources. In addition to that the extragalactic gamma-ray background may contain a signal of dark matter particles undergoing annihilation or decay. Thus, an accurate modeling of this emission will not only allow us to acquire a better understanding of the astrophysical objects and mechanisms contributing to it, but can be used to further constrain the properties of dark matter. We use the improved data on the gamma-ray background from the Fermi Large Area Telescope, to model the contribution to said background from various astrophysical objects, such as star-forming galaxies and blazars. We model the luminosity and redshift distribution and the gamma-ray spectra from these objects.