COMPTEL Observations of AGN

Details COMPTEL Observations of AGN COMPTEL Observations of AGN

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.6407b&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #64.07; Bulletin of the American Astronomical Society, Vol. 25, p.1390

Astronomy and Astrophysics

Astronomy

Scientific paper

The COMPTEL experiment on the Compton Gamma-Ray Observatory (CGRO), which operates in the 0.75-30 MeV energy range, has surveyed the entire sky since its launch in April, 1991. In addition to the radio galaxy Cen A, MeV emission has been detected from several blazar-type AGN (3C273, 3C279, PKS0528+134, and CTA102/3C454.3). All these blazars have been detected at higher energies by the EGRET experiment onboard GRO and they generally demand a break in their spectrum below the lower bound of EGRET measurements. We now have evidence for a MeV blazar not previously reported by EGRET. For this new COMPTEL detection, the (two) candidate sources are, as for the high-energy list, compact, flat-spectrum radio-loud sources. Having analysed the public EGRET data to complement that of COMPTEL, we see that the spectrum breaks around a few MeV, where the radiated power strongly peaks. The existence of such sources could explain the MeV bump in the diffuse gamma -ray background spectrum.

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