First results of an all-sky search for MeV-emission from active galaxies with COMPTEL

Details First results of an all-sky search for MeV-emission from active galaxies with COMPTEL First results of an all-sky search for MeV-emission from active galaxies with COMPTEL

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410.1356s&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 1356-1360 (1997).

Computer Science

Databases

1

Active And Peculiar Galaxies And Related Systems, Gamma-Ray, Gamma-Ray Sources, Gamma-Ray Bursts, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc.

Scientific paper

We present first results of a systematic search through COMPTEL all-sky maps for evidence of MeV gamma-ray emission from active galaxies. All-sky maximum-likelihood and flux maps have been produced from publicly-available COMPTEL datasets for individual CGRO viewing periods for the 4.5-year period covering Phases 1 to 4 of the CGRO mission (1991-1995), in four standard energy bins spanning the sensitive range of COMPTEL (0.8-30 MeV). From these all-sky maps we have extracted statistical likelihoods of source emission and corresponding fluxes or upper limits for ~150 candidate objects (primarily active galaxies) lying at high Galactic latitudes |b|>10°. Included in these results is a compilation of COMPTEL fluxes and/or limits for the unidentified high-latitude sources of the the Second EGRET Catalog. Our scientific objective is to derive the global properties of high-energy AGN in the medium-energy gamma-ray regime, and to provide cumulative fluxes or limits in the COMPTEL energy range for all high-energy AGN of interest. We describe our mapping and flux-extraction procedure and present a first sample of the results obtained in the form of representative figures. These cumulative results will ultimately be compared with studies of AGN for individual viewing periods, and used in statistical investigations of the various sub-classes of active galaxies.

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