Publication details for Professor Ian SmailSmail, I. & Blundell, K.M. (2013). X-ray emission around the z = 4.1 radio galaxy TN J1338-1942 and the potential role of far-infrared photons in AGN feedback. Monthly Notices of the Royal Astronomical Society 434(4): 3246-3251.
- Publication type: Journal Article
- ISSN/ISBN: 0035-8711, 1365-2966
- DOI: 10.1093/mnras/stt1240
- Keywords: Galaxies, Evolution galaxies, High-redshift galaxies, TN J1338−1942.
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
We report the discovery in an 80-ks observation of spatially extended X-ray emission around the high-redshift radio galaxy TN J1388−1942 (z = 4.11) with the Chandra X-ray Observatory. The X-ray emission extends over a ∼30-kpc diameter region and although it is less extended than the GHz-radio lobes, it is roughly aligned with them. We suggest that the X-ray emission arises from inverse-Compton (IC) scattering of photons by relativistic electrons around the radio galaxy. At z = 4.11, this is the highest redshift detection of IC emission around a radio galaxy. We investigate the hypothesis that in this compact source, the cosmic microwave background (CMB), which is ∼700× more intense than at z ∼ 0 is nonetheless not the relevant seed photon field for the bulk of the IC emission. Instead, we find a tentative correlation between the IC emission and far-infrared luminosities of compact, far-infrared luminous high-redshift radio galaxies (those with lobe lengths of ≲100 kpc). Based on these results, we suggest that in the earliest phases of the evolution of radio-loud active galactic nuclei at very high redshift, the far-infrared photons from the co-eval dusty starbursts occurring within these systems may make a significant contribution to their IC X-ray emission and so contribute to the feedback in these massive high-redshift galaxies.