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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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arxiv 2004.08979 v1 pith:5RZV6YKK submitted 2020-04-19 astro-ph.GA astro-ph.HE

Stanislav Shabala , Nika Jurlin , Raffaella Morganti , Marisa Brienza , Martin Hardcastle , Leith Godfrey , Martin Krause , Ross Turner This is my paper · ORCID
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keywords radioremnantpopulationsrestartedactivejetslofargalaxies
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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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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Numerical Simulations of Restarted Jets -- I. Dynamics

    astro-ph.HE 2026-07 accept novelty 6.5 of 10

    Restarted jets propagate ballistically through rarefied remnant cocoons with minimal backflow, decelerating only at dense entrained structures, after the cocoon evolves through conical-cylindrical-mushroom phases shap...

  2. SuperMIGHTEE : Spectral Ages of Remnant Radio Galaxy Candidates in the XMM-LSS Field

    astro-ph.GA 2026-07 accept novelty 6.0 of 10

    Sensitive 144 MHz–1.5 GHz SEDs confirm 12 genuine remnant radio galaxies with short spectral ages (~8–42 Myr) and diverse remnant fractions, revealing a rapidly fading high-z population.

  3. Revisiting Propagation Delays of Ultra-High-Energy Cosmic Rays from Long-lived Sources

    astro-ph.HE 2025-02 conditional novelty 4.0 of 10

    Propagation delays of ultra-high-energy cosmic rays in extragalactic magnetic fields can match or exceed AGN duty cycles, weakening the link between detected cosmic rays and their long-lived sources.

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