Mingo, B., Hardcastle, M.J., Ineson, J. et al. (6 more authors) (2017) An X-ray survey of the 2 Jy sample - II. X-ray emission from extended structures. Monthly Notices of the Royal Astronomical Society, 470 (3). pp. 2762-2779. ISSN 0035-8711
Abstract
The 2 Jy sample is a survey of radio galaxies with flux densities above 2 Jy at 2.7 GHz. As part of our ongoing work on the southern subset of 2 Jy sources, in paper I of this series we analysed the X-ray cores of the complete 2 Jy sample with redshifts 0.05 < z < 0.7. For this work we focus on the X-ray emission associated with the extended structures (jets, lobes, and environments) of the complete subset of 2 Jy sources with 0.05 < z < 0.2 that we have observed with Chandra. We find that hotspots and jet knots are ubiquitous in Fanaroff- Riley class II (FRII) sources, which also inhabit systematically poorer environments than the Fanaroff-Riley class I (FRI) sources in our sample. Spectral fits of the hotspots with good X-ray statistics invariably show properties consistent with synchrotron emission, and we show that inverse-Compton mechanisms underpredict the X-ray emission we observe by 1-2 orders of magnitude. Inverse-Compton emission is detected from many of the lobes in our sample, and we find that the lobes of the FRII sources show magnetic fields lower by up to an order of magnitude than expected from equipartition extrapolations. This is consistent with previous results, which show that most FRII sources have electron energy densities higher than minimum energy requirements.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record: B. Mingo, M. J. Hardcastle, J. Ineson, V. Mahatma, J. H. Croston, D. Dicken, D. A. Evans, R. Morganti, C. Tadhunter; An X-ray survey of the 2 Jy sample – II. X-ray emission from extended structures, Monthly Notices of the Royal Astronomical Society, Volume 470, Issue 3, 21 September 2017, Pages 2762–2779 is available online at: https://doi.org/10.1093/mnras/stx1307 |
Keywords: | galaxies: active; radio continuum: galaxies; X-rays: galaxies |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 18 Aug 2017 15:34 |
Last Modified: | 21 Mar 2018 20:39 |
Published Version: | https://doi.org/10.1093/mnras/stx1307 |
Status: | Published |
Publisher: | Oxford University Press |
Refereed: | Yes |
Identification Number: | 10.1093/mnras/stx1307 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:120331 |