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The Rossi X-ray Timing Explorer has observed the nearest radio galaxy,Centaurus A, in 13 intervals from 1966 August to 2009 February over the 3--200keV band. Spectra accumulated over the 13 intervals were well described with anabsorbed power law and iron line. Cut-off power laws and Compton reflectionfrom cold matter did not provide a better description. For the 2009 Januaryobservation, we set a lower limit on the cut-off energy at over 2 MeV. Thepower spectral density function was generated from RXTE/ASM and PCA data, aswell as an XMM-Newton long look, and clear evidence for a break at 18+10-7 days(68% conf.) was seen. Given Cen A's high black hole mass and very low value ofLx/LEdd, the break was a factor of 17+/-9 times higher than the break frequencypredicted by the McHardy and co-workers' relation, which was empiricallyderived for a sample of objects, which are radio-quiet and accreting atrelatively high values of Lbol/LEdd. We have interpreted our observations inthe context of a clumpy molecular torus. The variability characteristics andthe broadband spectral energy distribution, when compared to Seyferts, implythat the bright hard X-ray continuum emission may originate at the base of thejet, yet from behind the absorbing line of sight material, in contrast to whatis commonly observed from blazars.

Twelve and a Half Years of Observations of Centaurus A with RXTE