Substructure analysis of the RXCJ0232.2–4420 galaxy cluster

ABSTRACT RXCJ0232.2–4420, at z = 0.28, is a peculiar system hosting a radio halo source around the cool-core of the cluster. To investigate its formation and nature, we used archival Chandra and XMM–Newton X-ray data to study the dynamical state of the cluster and detect possible substructures in th...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2021-06, Vol.504 (1), p.610-620
Hauptverfasser: Parekh, Viral, Laganá, Tatiana F, Kale, Ruta
Format: Artikel
Sprache:eng
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Zusammenfassung:ABSTRACT RXCJ0232.2–4420, at z = 0.28, is a peculiar system hosting a radio halo source around the cool-core of the cluster. To investigate its formation and nature, we used archival Chandra and XMM–Newton X-ray data to study the dynamical state of the cluster and detect possible substructures in the hot gas. Its X-ray surface brightness distribution shows no clear disruption except an elongation in the north-east to south-west direction. We perform the unsharp masking technique and compute morphology parameters (Gini, M20, and concentration) to characterize the degree of disturbance in the projected X-ray emission. Both of these methods revealed a substructure, which is located at ∼1 arcmin from the cluster core in the south-west direction. Previous spectral analysis conducted for RXCJ0232.2–04420 concluded that there are a short cooling time and low entropy at the cluster centre, indicating that the cluster has a cool core. Thus, we suggest that RXCJ0232.2–4420 may be a system where the core of the cluster is not showing any sign of disturbance, but the south-west substructure could be pumping energy to the detected radio halo via turbulence.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stab779