Non-thermal pair model for the radio-galaxy Centaurus A

In this letter we consider the production of hard X-ray 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 similar to 120 keV in the 1991 high emission state is explained by gamma-gamma 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 degrees 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.