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A spatially-resolved spectral analysis of giant radio galaxies with MeerKAT

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arxiv 2411.06813 v1 pith:WVQ7RSPC submitted 2024-11-11 astro-ph.GA

K.K.L. Charlton , J. Delhaize , K. Thorat , I. Heywood , M. J. Jarvis , M. J. Hardcastle , Fangxia An , I. Delvecchio
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C. L. Hale I. H. Whittam M. Brüggen L. Marchetti L. Morabito Z. Randriamanakoto S. V. White A.R. Taylor
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classification astro-ph.GA
keywords mgtcspectralgrgsclusterj100022meerkatradioenvironments
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abstract

In this study we report spatially resolved, wideband spectral properties of three giant radio galaxies (GRGs) in the COSMOS field: MGTC J095959.63+024608.6 , MGTC J100016.84+015133.0 and MGTC J100022.85+031520.4. One such galaxy MGTC J100022.85+031520.4 is reported here for the first time with a projected linear size of 1.29 Mpc at a redshift of 0.1034. Unlike the other two, it is associated with a brightest cluster galaxy (BCG), making it one of the few GRGs known to inhabit cluster environments. We examine the spectral age distributions of the three GRGs using new MeerKAT UHF-band (544-1088 MHz) observations, and $L$-band (900-1670 MHz) data from the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey. We test two different models of spectral ageing, the Jaffe-Perola and Tribble models, using the Broadband Radio Astronomy Tools (\textsc{brats}) software which we find agree well with each other. We estimate the Tribble spectral age for MGTC J095959.63+024608.6 as 68 Myr, MGTC J100016.84+015133.0 as 47 Myr and MGTC J100022.85+031520.4 as 67 Myr. We find significant disagreements between these spectral age estimates and the estimates of the dynamical ages of these GRGs, modelled in cluster and group environments. Our results highlight the need for additional processes which are not accounted for in either the dynamic age or spectral age estimations.

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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. 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.

  2. The Jet Paths of Radio AGN and their Cluster Weather

    astro-ph.GA 2024-12 conditional novelty 4.0 of 10

    Bent radio AGN jets in X-ray galaxy groups are more bent in denser environments and closer to group centers, consistent with ram-pressure shaping.

  3. Source Finding and Characterisation for SKAO Science

    astro-ph.IM 2026-07 accept novelty 2.0 of 10

    A review of classical and ML source-finding and morphological classification techniques for SKAO-scale continuum and spectral-line surveys, with emphasis on limitations and pipeline needs.

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