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

Stanislav Shabala; Nika Jurlin; Raffaella Morganti; Marisa Brienza; Martin Hardcastle; Leith Godfrey; Martin Krause; Ross Turner

doi:10.1093/mnras/staa1172

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

Stanislav Shabala, Nika Jurlin, Raffaella Morganti, Marisa Brienza, Martin Hardcastle, Leith Godfrey, Martin Krause, Ross Turner

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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.

Original language	English
Article number	staa1172
Pages (from-to)	1706-1717
Number of pages	12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	496
Issue number	2
Early online date	30 Apr 2020
DOIs	https://doi.org/10.1093/mnras/staa1172
Publication status	Published - Aug 2020

Keywords

astro-ph.GA
astro-ph.HE

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200408979v1
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Accepted author manuscript, 980 KBLicence: Unspecified

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title = "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 (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. ",

keywords = "astro-ph.GA, astro-ph.HE",

author = "Stanislav Shabala and Nika Jurlin and Raffaella Morganti and Marisa Brienza and Martin Hardcastle and Leith Godfrey and Martin Krause and Ross Turner",

note = "14 pages, 7 figures, accepted for publication in MNRAS. Companion paper to Jurlin et al., also in today's arXiv posting",

year = "2020",

month = aug,

doi = "10.1093/mnras/staa1172",

language = "English",

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journal = "Monthly Notices of the Royal Astronomical Society",

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T1 - The duty cycle of radio galaxies revealed by LOFAR

T2 - remnant and restarted radio source populations in the Lockman Hole

AU - Shabala, Stanislav

AU - Jurlin, Nika

AU - Morganti, Raffaella

AU - Brienza, Marisa

AU - Hardcastle, Martin

AU - Godfrey, Leith

AU - Krause, Martin

AU - Turner, Ross

N1 - 14 pages, 7 figures, accepted for publication in MNRAS. Companion paper to Jurlin et al., also in today's arXiv posting

PY - 2020/8

Y1 - 2020/8

N2 - 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.

AB - 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.

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KW - astro-ph.HE

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DO - 10.1093/mnras/staa1172

M3 - Article

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VL - 496

SP - 1706

EP - 1717

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

M1 - staa1172

ER -

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

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