Journal Article

Inverse-Compton X-rays from giant radio galaxies at <i>z</i>∼ 1

T. Laskar, A. C. Fabian, K. M. Blundell and M. C. Erlund

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 401, issue 3, pages 1500-1504
Published in print January 2010 | ISSN: 0035-8711
Published online January 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.15769.x
Inverse-Compton X-rays from giant radio galaxies at z∼ 1

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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 Very Large Array 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 3 × 1059 and 8 × 1059 erg. The nuclei of these X-ray sources are heavily-absorbed powerful active galactic nuclei.

Keywords: galaxies: high-redshift; galaxies: jets; X-rays: galaxies; X-rays: individual (3C 469.1, MRC 2216−206, MRC 0947−249)

Journal Article.  3545 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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