Self-regulating AGN jets in MHD simulations of cool-core clusters yield realistic FRI radio morphologies viewed along the jet axis and account for frequency-independent lobe extents via 1-50 μG fields allowing both young and old electrons to radiate.
Spectral ageing in the lobes of FR-II radio galaxies: New methods of analysis for broadband radio data
7 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
The broad-bandwidth capabilities of next generation telescopes such as the JVLA mean that the spectrum of any given source varies significantly within the bandwidth of any given observation. Detailed spectral analysis taking this variation into account is set to become standard practice when dealing with any new broadband radio observations; it is therefore vital that methods are developed to handle this new type of data. In this paper, we present the Broadband Radio Astronomy ToolS (BRATS) software package and, use it to carry out detailed analysis of JVLA observations of three powerful radio galaxies. We compare two of the most widely used models of spectral ageing, the Kardashev-Pacholczyk and Jaffe-Perola models and also results of the more complex, but potentially more realistic, Tribble model. We find that the Tribble model provides both a good fit to observations as well as providing a physically realistic description of the source. We present the first high-resolution spectral maps of our sources and find that the best-fitting injection indices across all models take higher values than has previously been assumed. We present characteristic hot spot advance speeds and make comparison to those derived from dynamical ages, confirming the previously known discrepancy in speed remains present when determined at high spectral resolutions. We show that some previously common assumptions made in determining spectral ages with narrow-band radio telescopes may not always hold and strongly suggest these are accounted for in future investigations.
years
2026 7verdicts
UNVERDICTED 7representative citing papers
Spectral ages of 34 Myr (WAT) and 21 Myr (HT) are much younger than dynamical ages of 140-700 Myr, indicating IGM interactions and possible re-acceleration.
Presents ultra-low frequency spectral index maps for 22 bright extended radio galaxies showing indices of ~0.5 near cores rising to >1.0 in lobes for FR I sources and 0.5-0.9 in FR II hotspots.
LAMBDA proposes megameter-scale baselines using additional Australian stations to extend SKA-Low for high-resolution low-frequency VLBI.
SKAO will trace synchrotron jets, thermal emission, and low-column-density HI gas in nearby AGN to characterize duty cycles and multi-phase feeding/feedback linked to star formation.
The paper reviews radio galaxy physics and outlines SKA-enabled studies of jet duty cycles, episodic activity, and dying sources.
The chapter summarizes gaps in AGN jet research and projects how SKA standalone and combined observations will address jet-host galaxy co-evolution across scales.
citing papers explorer
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Simulating realistic radio morphologies of Fanaroff-Riley I jets in a self-regulating cool-core cluster
Self-regulating AGN jets in MHD simulations of cool-core clusters yield realistic FRI radio morphologies viewed along the jet axis and account for frequency-independent lobe extents via 1-50 μG fields allowing both young and old electrons to radiate.
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The ultra low-frequency spectral properties of bright extended radio galaxies in the 3CRR catalogue
Presents ultra-low frequency spectral index maps for 22 bright extended radio galaxies showing indices of ~0.5 near cores rising to >1.0 in lobes for FR I sources and 0.5-0.9 in FR II hotspots.
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AGN Feeding & Feedback Over the Galactic Scales
SKAO will trace synchrotron jets, thermal emission, and low-column-density HI gas in nearby AGN to characterize duty cycles and multi-phase feeding/feedback linked to star formation.
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Radio Galaxies and Jet Duty Cycles
The paper reviews radio galaxy physics and outlines SKA-enabled studies of jet duty cycles, episodic activity, and dying sources.
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AGN Jets from Formation to Dissipation
The chapter summarizes gaps in AGN jet research and projects how SKA standalone and combined observations will address jet-host galaxy co-evolution across scales.