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.

13 pages, 6 figures, accepted by ApJ

References in corpus (16)

• Shocks and cold fronts in galaxy clusters
• Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the 2500-square-degree SPT-SZ survey
• Diffuse Radio Emission from Galaxy Clusters
• The origin of cold fronts in the cores of relaxed galaxy clusters
• X-ray cavities in a sample of 83 SPT-selected clusters of galaxies: Tracing the evolution of AGN feedback in clusters of galaxies out to z=1.2
• Do radio core-halos and cold fronts in non major merging clusters originate from the same gas sloshing?
• Chandra's View of the Ram Pressure Stripped Galaxy M86
• New scaling relations in cluster radio halos and the re-acceleration model
• The Extended GMRT Radio Halo Survey II: Further results and analysis of the full sample
• The growth of the galaxy cluster Abell 85: mergers, shocks, stripping and seeding of clumping
• Nonthermal Emission Associated with Strong AGN Outbursts at the Centers of Galaxy Clusters
• A distant radio mini-halo in the Phoenix galaxy cluster
• How Much Can We Learn From A Merging Cold Front Cluster? : Insights From X-ray Temperature and Radio Maps of Abell 3667
• X-ray Observations of Complex Temperature Structure in the Cool-core cluster Abell 85
• The Galaxy Cluster 'Pypeline' for X-ray Temperature Maps: ClusterPyXT
• Role of intracluster supernovae in radio mini-halos in galaxy clusters

Cited by in corpus (2)

• On the relation between mini-halos and AGN feedback in clusters of galaxies
• Unveiling The Origin of Peculiar Diffuse Radio Emission in Abell 1351