Further Limits on MeV Emission from Active Galaxies Measured with COMPTEL

Details Further Limits on MeV Emission from Active Galaxies Measured with COMPTEL Further Limits on MeV Emission from Active Galaxies Measured with COMPTEL

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.0206s&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #02.06; Bulletin of the American Astronomical Society, Vol. 32, p.1183

Astronomy and Astrophysics

Astronomy

Scientific paper

We have extended our earlier work to establish cumulative flux limits in the COMPTEL energy range (0.75-30 MeV) for a large sample of active galactic nuclei (AGN) of general interest. The target list of objects consists of known or suspected gamma-ray sources at high Galactic latitude, including unidentified sources listed in the Third EGRET Catalog of Hartmann et al. (1999, ApJS, 123, 79). Limits to the time-averaged MeV-emission measured with COMPTEL are derived from all-sky maximum-likelihood significance and flux maps produced using COMPTEL datasets spanning the time period April 1991 to November 1997 (i.e., through CGRO Cycle 6). We describe our data-processing and analysis procedures and present a summary of the results obtained. These latest limits are compared to our original results presented in the First COMPTEL Source Catalog of Schönfelder et al. (2000, A&ASupplSer, 143, 145) for which we employed composite all-sky maps covering a more restricted time period of observation. The latest flux limits obtained here will be used to assess the possible contribution of AGN to the diffuse gamma-ray background measured with COMPTEL in the MeV regime. This research and the CGRO/COMPTEL project have been supported by NASA, the German government through DARA, and the Netherlands Organisation for Space Research (NWO).

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