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 languageEnglish
Article numberstaa1172
Pages (from-to)1706-1717
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume496
Issue number2
Early online date30 Apr 2020
DOIs
Publication statusPublished - Aug 2020

Keywords

  • astro-ph.GA
  • astro-ph.HE

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