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

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

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 A...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2020-08, Vol.496 (2), p.1706-1717
Hauptverfasser: Shabala, Stanislav S, Jurlin, Nika, Morganti, Raffaella, Brienza, Marisa, Hardcastle, Martin J, Godfrey, Leith E H, Krause, Martin G H, Turner, Ross J
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container_end_page 1717
container_issue 2
container_start_page 1706
container_title Monthly notices of the Royal Astronomical Society
container_volume 496
creator Shabala, Stanislav S
Jurlin, Nika
Morganti, Raffaella
Brienza, Marisa
Hardcastle, Martin J
Godfrey, Leith E H
Krause, Martin G H
Turner, Ross J
description 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.
doi_str_mv 10.1093/mnras/staa1172
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title The duty cycle of radio galaxies revealed by LOFAR: remnant and restarted radio source populations in the Lockman Hole
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