Extragalactic gamma-ray background from star-forming galaxies: Will empirical scalings suffice?

The Extragalactic Gamma-Ray Background

The COMPTEL and EGRET detectors aboard the Compton Gamma-Ray Observatory measured an extragalactic γ-ray background (EGRB) extending from ∼ 1 MeV to ∼ 100 GeV. Calculations performed making reasonable assumptions indicate that blazars can account for the background between ∼ 10 MeV and ∼ 10 GeV. Below 30 MeV, the background flux and spectrum are not very well determined and a dedicated satellit...

X-ray emission from star-forming galaxies

Gamma-ray bursts in normal and extreme star-forming galaxies

We discuss how gamma-ray burst (GRB) optical afterglows and multiwavelength observations of their host galaxies can be used to obtain information about the relative amounts of star formation happening in optical and submillimetre galaxies. That such an analysis will be possible follows from the currently-favoured idea that GRBs are closely linked with high-mass star formation. Studying GRB host...

GLAST and the Extragalactic Gamma Ray Background

We show that GLAST should be able to support or rule out the unresolved-blazar hypothesis for the origin of the diffuse, extragalactic gamma ray background.

Extragalactic gamma-ray background radiation from dark matter annihilation

If dark matter is composed of neutralinos, one of the most exciting prospects for its detection lies in observations of the gamma-ray radiation created in pair annihilations between neutralinos, a process that may contribute significantly to the extragalactic gamma-ray background (EGB) radiation. We here use the high-resolution MillenniumII simulation of cosmic structure formation to produce th...