CGRO observations of the MeV-bright blazars PKS 0208-512 and GRO J0516-609.
Abstract
PKS 0208-512 and GRO J0516-609 have recently been identified as the most prominent members of a possible sub-class of blazar-type AGNs that are exceptionally bright at MeV energies (``MeV-blazars''). We summarize here the findings for GRO J0516-609 and present updated analysis results for PKS 0208-512 based on simultaneous observations with EGRET and COMPTEL. Significant time variability is clearly seen in the PKS 0208-512 spectrum at high as well as medium γ-ray energies. We present spectra suggesting a distinct spectral upturn from the EGRET energy regime into the COMPTEL regime. The presence of a pronounced spectral component at about 1-10MeV appears now well established for these sources.
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- December 1996
- Bibcode:
- 1996A&AS..120C.507B
- Keywords:
-
- GAMMA RAYS: OBSERVATIONS;
- GALAXIES: ACTIVE;
- GALAXIES: QUASARS: INDIVIDUAL: PKS 0208-512;
- GRO J0516-609