Probing the origin of diffuse radio emission in the cool-core of the Phoenix galaxy cluster

Abstract

Cool core galaxy clusters are considered to be dynamically relaxed clusters with regular morphology and highly X-ray luminous central region. However, cool core clusters can also be sites for merging events that exhibit cold fronts in X-ray and mini-halos in radio. We present recent radio/X-ray observations of the Phoenix Cluster or SPT-CL J2344-4243 at the redshift of $z=0.596$. Using archival {\it Chandra} X-ray observations, we detect spiraling cool gas around the cluster core as well as discover two cold fronts near the core. It is perhaps the most distant galaxy cluster to date known to host cold fronts. Also, we present JVLA\footnote{Jansky Very Large Array\\ \url{https://science.nrao.edu/facilities/vla}} 1.52 GHz observations of the minihalo, previously discovered at 610 MHz with GMRT\footnote{Giant Metrewave Radio Telescope\\ \url{http://www.gmrt.ncra.tifr.res.in}} observations in the center of the Phoenix galaxy cluster. The minihalo flux density at 1.52 GHz is $9.65\pm 0.97$ mJy with the spectral index between 610 MHz and 1.52 GHz being $-0.98\pm 0.16$\footnote{$S_{\nu }={\nu }^{\alpha }$ where $S_{\nu }$}. A possible origin of these radio sources is turbulence induced by sloshing of the gas in the cluster core.

arXiv comment13 pages, 6 figures, accepted by ApJ

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• An X-ray and Radio Study of the Hubble Frontier Field Cluster Abell S1063
• Exploring diffuse radio emission in galaxy clusters and groups with the uGMRT and the SKA
• Very Large Array observations of the mini-halo and AGN feedback in the Phoenix cluster
• Unveiling The Origin of Peculiar Diffuse Radio Emission in Abell 1351