The Suzaku View of the Disk-Jet Connection in the Low Excitation Radio   Galaxy NGC 6251
  We present results from an 87-ks Suzaku observation of the canonical low-excitation radio galaxy (LERG) NGC 6251. We have previously suggested that LERGs violate conventional AGN unification schemes: they may lack an obscuring torus and are likely to accrete in a radiatively inefficient manner, with almost all of the energy released by the accretion process being channeled into powerful jets. We model the 0.5-20 keV Suzaku spectrum with a single power law of photon index $\Gamma=1.82^{+0.04}_{-0.05}$, together with two collisionally ionized plasma models whose parameters are consistent with the known galaxy- and group-scale thermal emission. Our observations confirm that there are no signatures of obscured, accretion-related X-ray emission in NGC 6251, and we show that the luminosity of any such component must be substantially sub-Eddington in nature. 
D. A. Evans (1, 2), A. C. Summers (2), M. J. Hardcastle (3), R. P.   Kraft (1), P. Gandhi (4), J. H. Croston (5), J. C. Lee ...
astro-ph.HE astro-ph.CO