Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ap%26ss.249..303r&link_type=abstract
Astrophysics and Space Science, Volume 249, Issue 2, pp.303-339
Astronomy and Astrophysics
Astrophysics
Scientific paper
High energy gammay-ray emission from an extended region between the squasars 3C273 and 3C279 in Virgo has been detected by the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory(CGRO). This emission shows a remarkably constant flux over an observation time of 21/2 years between June 1991 and December 1993. The data analysis shows, that the structure is not the result of an instrumental effect. The object has a perfect power law photon spectrum with index α=-2.06 ± 0.05 which is different from the spectra of the neighboring quasars 3C273 and 3C279. Integration of the spectrum leads to a flux estimation of (7.0± 0.3) × 10-7 γ cm-2s-1 above 100 MeV. No galactic or extragalactic counterpart is found at other wavelengths. Indications point, however, at an extragalactic origin of the gamma radiation.
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