Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprb17089s&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The southern blazar PKS 0208-512 is one of the most prominent gamma-ray sources in the extragalactic sky. Over the course of the Compton Gamma Ray Observatory mission (1991-2000) it was detected numerous times with the high-energy EGRET telescope, and also identified as an ``MeV blazar'' candidate with the medium-energy COMPTEL instrument. We present a comprehensive summary of the gamma-ray observations of this source from GeV to MeV energies with EGRET and COMPTEL. At GeV energies PKS 0208-512 was highly variable on several time scales, and exhibited significant spectral evolution in its high-energy emission between high and low states of activity. It is one of the most dramatic examples of this effect in the EGRET database. We also summarize the results of a search for MeV emission from this object during individual CGRO viewing periods, and assess their implications. Finally, we interpret the gamma-ray measurements in terms of recent models of the production of high-energy emission in gamma-ray AGNs, and consider the likely contribution of such sources to the cosmic diffuse gamma-ray background.
Sreekumar Parameswaran
Stacy John Gregory
Vestrand Thomas W.
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