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

Journal
Date Issued
2020
Author(s)
Shabala, Stanislav S.
•
Jurlin, Nika
•
•
•
Hardcastle, Martin J.
•
Godfrey, Leith E. H.
•
Krause, Martin G. H.
•
Turner, Ross J.
DOI
Abstract
Feedback from radio jets associated with active galactic nuclei (AGNs) 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 AGNs 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 per cent) 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....
Volume
496
Issue
2
Start page
1706
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2020MNRAS.496.1706S
Rights
open.access
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