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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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posted on 2023-05-20, 13:44 authored by Stanislav ShabalaStanislav Shabala, Jurlin, N, Morganti, R, Brienza, M, Hardcastle, MJ, Godfrey, LEH, Krause, MGH, Ross TurnerRoss Turner
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.

Funding

Department of Education, Skills and Employment

History

Publication title

Monthly Notices of the Royal Astronomical Society

Volume

496

Pagination

1706-1717

ISSN

0035-8711

Department/School

School of Natural Sciences

Publisher

Blackwell Publishing Ltd

Place of publication

9600 Garsington Rd, Oxford, England, Oxon, Ox4 2Dg

Rights statement

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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  • Open

Socio-economic Objectives

Expanding knowledge in the physical sciences

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