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Mode of accretion in episodic radio galaxies and the dynamics of their outer relic lobes

Konar, C.; Hardcastle, M. J.; Croston, J. H.; Jamrozy, M.; Hota, Ananda and Das, Tapas K. (2019). Mode of accretion in episodic radio galaxies and the dynamics of their outer relic lobes. Monthly Notices of the Royal Astronomical Society, 486(3) pp. 3975–3991.

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We present X-ray observations with the X-ray Multi-Mirror Mission Newton (XMM-Newton) telescope of three Double-Double Radio Galaxies (DDRGs). We have detected the core, lobes and the environment of our sample DDRGs in X-rays. We examine the relationships between the radio and X-ray emission and attribute the X-ray emission from the lobes to the inverse-Compton scattering of cosmic microwave background (CMB) photons against the leptons of the radio lobes. The magnetic field strength of the lobes is close to the equipartition value. The X-ray spectrum of the cores of the DDRGs consists of an unabsorbed soft power-law component and no sign of hard power law components. The soft unabsorbed component is likely to be related to the radio jets. In optical wavebands, there is no strong [O III] lines observed and the host galaxies are not detected in all four bands (namely 2.4, 4.6, 12, 22 µm) of Wide-Field Infrared Survey Explorer (WISE) survey. This shows that they are low excitation radio galaxies. These DDRGs have poor group scale ambient media. We discuss the implications of this observation for models of the episodic activity in DDRGs.

Item Type: Journal Item
Copyright Holders: 2019 The Authors
ISSN: 1365-2966
Keywords: galaxies: active; galaxies: jets; galaxies: nuclei; quasars: general; galaxies: individual: J0116−4722, J1158+2621, J1548−3216; X-rays: galaxies
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 60696
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 30 Apr 2019 08:14
Last Modified: 07 Jul 2020 05:03
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