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The duty cycle of radio galaxies revealed by LOFAR: remnant and restarted radio source populations in the Lockman Hole

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Shabala, SS ORCID: 0000-0001-5064-0493, Jurlin, N, Morganti, R, Brienza, M, Hardcastle, MJ, Godfrey, LEH, Krause, MGH and Turner, RJ ORCID: 0000-0002-4376-5455 2020 , 'The duty cycle of radio galaxies revealed by LOFAR: remnant and restarted radio source populations in the Lockman Hole' , Monthly Notices of the Royal Astronomical Society , pp. 1-14 , doi: 10.1093/mnras/staa1172.

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Abstract

Feedback from radio jets associated with Active Galactic Nuclei (AGN) plays a profound role in the evolution of galaxies. Kinetic power of these radio jets appears to show temporal variation, but the mechanism(s) responsible for this process are not yet clear. Recently, the LOw Frequency ARray (LOFAR) has uncovered large populations of active, remnant and restarted radio jet populations. By focusing on LOFAR data in the Lockman Hole, in this work we use the Radio AGN in Semi-Analytic Environments (RAiSE) dynamical model to present the first self-consistent modelling analysis of active, remnant and restarted radio source populations. Consistent with other recent work, our models predict that remnant radio lobes fade quickly. Any high (> 10 percent) observed fraction of remnant and restarted sources therefore requires a dominant population of short-lived jets. We speculate that this could plausibly be provided by feedback-regulated accretion.

Item Type: Article
Authors/Creators:Shabala, SS and Jurlin, N and Morganti, R and Brienza, M and Hardcastle, MJ and Godfrey, LEH and Krause, MGH and Turner, RJ
Keywords: galaxies: active, galaxies: jets, radio continuum: galaxies
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Blackwell Publishing Ltd
ISSN: 0035-8711
DOI / ID Number: 10.1093/mnras/staa1172
Copyright Information:

Copyright 2020 The Authors. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©:2020 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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