A Monte Carlo Study of the Irreducible Background in the EGRET Instrument

Details A Monte Carlo Study of the Irreducible Background in the EGRET Instrument A Monte Carlo Study of the Irreducible Background in the EGRET Instrument

2007-06-01

arxiv.org/abs/0706.0220v1

Astronomy and Astrophysics

Astrophysics

Contribution to the 30th ICRC, Merida, Mexico

Scientific paper

The diffuse extragalactic gamma-ray background (EGRB) has been derived by various groups from observations by the Energetic Gamma Ray Experiment Telescope (EGRET) instrument on the Compton Gamma Ray Observatory (CGRO). The derived EGRB consists of gamma rays that may come from astrophysical components, such as from unresolved extragalactic point sources (blazars, normal galaxies, etc.), true extragalactic diffuse emission, misattributed diffuse signals from the Galaxy and other celestial sources, and an irreducible instrumental background due to gamma rays produced by cosmic-ray (CR) interactions in the EGRET instrument. Using the Gamma Ray Large Area Space Telescope (GLAST) simulation and reconstruction software, we have investigated the magnitude of the irreducible instrumental background in the GLAST Large Area Telescope. We re-scale our results to the EGRET and present preliminary results of our study and its effect on current estimates of the EGRB.

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