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Radio galaxy zoo: New giant radio galaxies in the RGZ DR1 catalogue


Tang, H and Scaife, AMM and Wong, OI and Kapinska, AD and Rudnick, L and Shabala, SS and Seymour, N and Norris, RP, Radio galaxy zoo: New giant radio galaxies in the RGZ DR1 catalogue, Monthly Notices of the Royal Astronomical Society, 499, (1) pp. 68-76. ISSN 0035-8711 (2020) [Refereed Article]

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This article has been accepted for publication in Monthly notices of the Royal Astronomical Society : 2020 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

DOI: doi:10.1093/mnras/staa2805


In this paper, we present the identification of five previously unknown giant radio galaxies (GRGs) using Data Release 1 of the Radio Galaxy Zoo citizen science project and a selection method appropriate to the training and validation of deep learning algorithms for new radio surveys. We associate one of these new GRGs with the brightest cluster galaxy (BCG) in the galaxy cluster GMBCG J251.67741+36.45295 and use literature data to identify a further 13 previously known GRGs as BCG candidates, increasing the number of known BCG GRGs by >60 per cent. By examining local galaxy number densities for the number of all known BCG GRGs, we suggest that the existence of this growing number implies that GRGs are able to reside in the centres of rich (∼1014 M) galaxy clusters and challenges the hypothesis that GRGs grow to such sizes only in locally underdense environments.

Item Details

Item Type:Refereed Article
Keywords:methods: data analysis catalogues radio continuum: galaxies
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Shabala, SS (Associate Professor Stas Shabala)
ID Code:145545
Year Published:2020
Deposited By:Physics
Deposited On:2021-07-26
Last Modified:2021-09-22
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