How unusual is the cool-core radio halo cluster CL1821+643 ?

Ruta Kale; Viral Parekh

doi:10.1093/mnras/stw796

paper

How unusual is the cool-core radio halo cluster CL1821+643 ?

arXiv:1608.01819 · doi:10.1093/mnras/stw796

Abstract

Massive galaxy clusters with cool-cores typically host diffuse radio sources called mini-haloes, whereas, those with non-cool-cores host radio haloes. We attempt to understand the unusual nature of the cool-core galaxy cluster CL1821+643 that hosts a Mpc-scale radio halo using new radio observations and morphological analysis of its intra-cluster medium. We present the Giant Metrewave Radio Telescope (GMRT) 610 MHz image of the radio halo. The spectral index, $α$ defined as $S \propto ν^{- α}$ , of the radio halo is $1.0 \pm 0.1$ over the frequency range of 323 - 610 - 1665 MHz. Archival {\it Chandra} X-ray data were used to make surface brightness and temperature maps. The morphological parameters Gini, $M_{20}$ and concentration ( $C$ ) were calculated on X-ray surface brightness maps by including and excluding the central quasar (H1821+643) in the cluster. We find that the cluster CL1821+643, excluding the quasar, is a non-relaxed cluster as seen in the morphological parameter planes. It occupies the same region as other merging radio halo clusters in the temperature- morphology parameter plane. We conclude that this cluster has experienced a non-core-disruptive merger.

arXiv comment8 pages, 6 figures

How unusual is the cool-core radio halo cluster CL1821+643 ?

Abstract

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