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We report the results of a Suzaku X-ray imaging study of NGC6251, a nearbygiant radio galaxy with intermediate FR I/II radio properties. Our pointingdirection was centered on the gamma -ray emission peak recently discovered withFermi-LAT around the position of the north-west radio lobe 15 arcmin offsetfrom the nucleus. After subtracting two "off-source" pointings adjacent to theradio lobe, and removing possible contaminants in the XIS field of view, wefound significant residual X-ray emission most likely diffuse in nature. Thespectrum of the excess X-ray emission is well fit by a power law with photonindex \Gamma = 1.90 +- 0.15 and a 0.5 - 8 keV flux of 4 x 10^{-13} erg cm^{-2}s^{-1}. We interpret this diffuse X-ray emission component as being due toinverse-Compton up-scattering of the cosmic microwave background photons byultrarelativistic electrons within the lobe, with only a minor contributionfrom the beamed emission of the large-scale jet. Utilizing archival radio datafor the source, we demonstrate by means of broad-band spectral modeling thatthe -ray flux of the Fermi-LAT source 2FGL J1629.4+8236 may well be accountedfor by the high-energy tail of the inverse-Compton continuum of the lobe. Thus,this claimed association of gamma-rays from the north-west lobe of NGC6251,together with the recent Fermi-LAT imaging of the extended lobes of CentaurusA, indicates that particles may be efficiently (re-)accelerated up toultrarelativistic energies within extended radio lobes of nearby radio galaxiesin general.

Suzaku X-ray Imaging of the Extended Lobe in the Giant Radio Galaxy NGC6251 Associated with the Fermi-LAT Source 2FGLJ1629.4+8236