Inverse Compton X-rays from Giant Radio Galaxies at z~1

Abstract

We report XMM-Newton observations of three FR II radio galaxies at redshifts between 0.85 and 1.34, which show extended diffuse X-ray emission within the radio lobes, likely due to inverse-Compton up-scattering of the cosmic microwave background. Under this assumption, through spectrum-fitting together with archival VLA radio observations, we derive an independent estimate of the magnetic field in the radio lobes of 3C 469.1 and compare it with the equipartition value. We find concordance between these two estimates as long as the turnover in the energy distribution of the particles occurs at a Lorentz factor in excess of ~ 250. We determine the total energy in relativistic particles in the radio emitting lobes of all three sources to range between 3e59 and 8e59 erg. The nuclei of these X-ray sources are heavily-absorbed powerful AGN.

5 pages, 7 figures, 2 tables. Accepted for publication in MNRAS

References in corpus (5)

• Discovery of the low-energy cutoff in a powerful giant radio galaxy
• Extended inverse-Compton emission from distant, powerful radio galaxies
• The extended X-ray emission around HDF130 at z=1.99: an inverse Compton ghost of a giant radio source in the Chandra Deep Field North
• The inverse-Compton X-ray-emitting lobes of the high-redshift giant radio galaxy 6C 0905+39
• 0.5 Mpc-scale extended X-ray emission in 4C 23.56

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• Hard X-ray selected giant radio galaxies - I. The X-ray properties and radio connection
• The X-ray and radio-emitting plasma lobes of 4C23.56: further evidence of recurrent jet activity and high acceleration energies
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• The 3CR $Chandra$ extragalactic survey at 1.0$<z<$1.5
• Powerful Radio Sources in the Southern Sky. I. Optical Identifications
• AGN feedback in an infant galaxy cluster: the LOFAR-Chandra view of the giant FRII radio galaxy J103025+052430 at z=1.7