Observations of the 1 Mpc radio source 6C0905+3955 and the half-Mpc source 3C356

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Active Galactic Nuclei, Quasars, Bl-Lac Objects, X-Ray Background, 6C0905+3955, 3C356, Xmm-Newton Proposal 04008302

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Extended X-ray emission has been discovered around several distant powerful radio galaxies. The emission is most likely due to inverse Compton scattering of CMB photons by old radio synchrotron particles. The X-ray emission thus traces the total input of relativistic electrons into the surroundings of the radio galaxy, and the amount of energy injected, which will affect the gas properties of the host galaxy, group and cluster. All massive galaxies may have passed through such a phase. We propose to take a deep 60 ks observation of the exceptionally large 1 Mpc diameter, distant z=1.88 radio galaxy, 6C0905+3955, and a 20 ks observation of the 1/2 Mpc diameter z=1.08 radio galaxy 3C356. Both sources are known from our previous work to have extended X-ray emission along the radio source axis.

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