Limits on MeV gamma-ray emission from active galaxies and other unidentified high-latitude gamma-ray sources observed with COMPTEL

Document Type

Conference Proceeding

Publication Date



We have established cumulative flux limits in the COMPTEL energy range (0.8-30 MeV) for a large sample of active galactic nuclei (AGN) of general interest. Our target list consists of both known and unidentified gamma-ray sources at high Galactic latitudes (|b|>10°). Limits to the timeaveraged MeV-emission measured with COMPTEL are derived from all-sky maximum-likelihood significance and flux maps produced using the full COMPTEL dataset spanning the entire nine-year period of the CGRO mission (April 1991-June 2000). The flux limits described here will be used to assess the contribution of AGN to the diffuse gamma-ray background measured in the MeV regime, and may serve to constrain the emission processes operative in high-energy cosmic sources. These results will also complement those anticipated from the high-energy GLAST mission scheduled forlaunch later this year.

Publication Source (Journal or Book title)

Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007

First Page


Last Page


This document is currently not available here.