Probing the origin of diffuse radio emission in the cool-core of the Phoenix galaxy cluster
| Autor: | Brian Alden, David Rapetti, Eric J. Hallman, Surajit Paul, Majidul Rahaman, R. J. van Weeren, Ramij Raja, Abhirup Datta, Jack O. Burns, Huib Intema |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Spectral index Giant Metrewave Radio Telescope 010504 meteorology & atmospheric sciences Center (category theory) FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Astrophysics - Astrophysics of Galaxies Redshift Jansky Cold front Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Cluster (physics) Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Galaxy cluster 0105 earth and related environmental sciences |
| Zdroj: | The Astrophysical Journal, 889(2), 128 |
| DOI: | 10.48550/arxiv.1912.07853 |
| Popis: | 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. Comment: 13 pages, 6 figures, accepted by ApJ |
| Databáze: | OpenAIRE |
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