Extragalactic gamma-ray emission is produced in various sources: supernova (located in other galaxies) and perhaps pulsars, active galactic nuclei.
Unresolved extragalactic sources give rise to background gamma-ray emission.
What are data (theoretical/experimental) on extragalactic background gamma-ray emission at energies 0.2 TeV – 50 TeV?
Аня, я думаю в экспериментах, работающих на этих энергиях, должны знать. Трудность в том, что все занимаются определенными источниками и возможно фоном не интересуются, если он невелик и не мешает их исследованиям. Можно во всяком случае спросить у Ерлыкина и Докучаева.
Cheers, Olga
The Fermi-LAT experiment has a measurement of the background up to about 0.8 TeV (http://inspirehep.net/record/1322068). Any model of the background at higher energies will be based on this data and catalogs of point sources. For example, http://inspirehep.net/record/1340657.
It is difficult to detect a flux at higher energies because the event rates are too small, and space-based experiments cannot be made with larger volumes, constrained by current rocket technology that would be needed to deploy them.
HAWC is a new ground-based experiment that is currently detecting TeV-scale gamma-rays with a large field-of-view.
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