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NON-THERMAL PAIR MODEL FOR THE RADIO-GALAXY CENTAURUS A

In this letter we consider the production of hard Xray spectrum of the radio galaxy Centaurus A by a relativistic electron-positron beam scattering soft photons coming from an accretion disk. The spectral break of order of 0.7 observed at ∼ 120 keV in the 1991 high emission state is explained by γ−γ absorption of soft gamma-ray photons. The misaligned nature of the relativistic jet explains a redshifted spectral break with regard to pair creation energy threshold. We fit the data with a jet direction making an angle of 80◦ with the line of sight. We also consider lower Thomson optical depth solutions, and we apply them to the 1992-1994 low state of activity of the source.