3C273 Revisited - Confirmation by Cos-B of High Energy Gamma-Ray Emission

Astronomy and Astrophysics – Astrophysics

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The results of a second observation in the Virgo region by the ESA COS-B satellite are presented. The presence of a high- energy (50800 MeV) y-radiation source is confirmed, and its position is consistent with 3C273. The error box at the 90% confidence level containing the quasar is ˜2.5 square degrees, and the probability of a chance coincidence of the γ-ray source with 3C273 is approximately 10-3 . No variation of the γ-ray fluxes between the two observations in July 76 and June 78 is observed within the ˜50% uncertainty. Spectral γ-ray data for the total 3C273 data set are presented and compared with low and high- energy X-ray contemporary measurements. Recent Einstein Observatory X-ray data on the short term variability of the central part of the QSO are used to show that, within reasonable assumptions, the photon-photon interaction excludes the γ-ray source from coinciding with the variable X-ray source, thus ruling out comptonisation models for the production of energetic photons.

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