ATCA 16 cm Observation of CIZA J1358.9-4750: Implication of Merger Stage and Constraint on Non-Thermal Properties

Abstract

We report the Australia Telescope Compact Array 16 cm observation of CIZA J1358.9-4750. Recent X-ray studies imply that this galaxy cluster is composed of merging, binary clusters. Using the EW367 configuration, we found no significant diffuse radio emission in and around the cluster. An upper limit of the total radio power at 1.4 GHz is $\sim 1.1\times 10^{22}$ Watt/Hz in $30$ square arcminutes which is a typical size of radio relics. It is known that an empirical relation holds between the total radio power and X-ray luminosity of the host cluster. The upper limit is about one order of magnitude lower than the power expected from the relation. Very young ($\sim 70$ Myr) shocks with low Mach numbers ($\sim 1.3$), which are often seen at an early stage of merger simulations, are suggested by the previous X-ray observation. The shocks may generate cosmic-ray electrons with a steep energy spectrum, which is consistent with non-detection of bright ($>10^{23}$ Watt/Hz) relic in this 16 cm band observation. Based on the assumption of energy equipartition, the upper limit gives the magnetic-field strength below $0.68f(D_{\mathrm{los}}/1\mathrm{Mpc}{)}^{-1}({\gamma }_{\min }/200{)}^{-1}$ $\mu$G, where $f$ is the cosmic-ray total energy density over the cosmic-ray electron energy density, $D_{\mathrm{los}}$ is the depth of the shock wave along the sightline and ${\gamma }_{\min }$ is the lower cutoff Lorentz factor of the cosmic-ray electron energy spectrum.

11 pages, 8 figures, accepted for publication in PASJ

References in corpus (20)

• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• Shocks and cold fronts in galaxy clusters
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue
• On the connection between giant radio halos and cluster mergers
• The Case for Electron Re-Acceleration at Galaxy Cluster Shocks
• Non-Thermal Electron Acceleration in Low Mach Number Collisionless Shocks. I. Particle Energy Spectra and Acceleration Mechanism
• Cosmic rays and Radio Halos in galaxy clusters : new constraints from radio observations
• Simulating polarized Galactic synchrotron emission at all frequencies, the Hammurabi code
• A new double radio relic in PSZ1 G096.89+24.17 and a radio relic mass-luminosity relation
• The Extended GMRT Radio Halo Survey II: Further results and analysis of the full sample
• A giant radio halo in the cool core cluster CL1821+643
• The radio relic in Abell 2256: overall spectrum and implications for electron acceleration
• MC^2: Galaxy Imaging and Redshift Analysis of the Merging Cluster CIZA J2242.8+5301
• The Sunyaev-Zel'dovich Effect at Five Arc-seconds: RXJ1347.5-1145 Imaged by ALMA
• Turbulent Cosmic Ray Reacceleration at Radio Relics and Halos in Clusters of Galaxies
• MC^2: Mapping the Dark Matter Distribution of the "Toothbrush" Cluster RX J0603.3+4214 with Hubble Space Telescope and Subaru Weak-lensing
• Shock Acceleration Model for the Toothbrush Radio Relic
• N-body + Magnetohydrodynamical Simulations of Merging Clusters of Galaxies: Characteristic Magnetic Field Structures Generated by Bulk Flow Motion
• Turbulent Cosmic-Ray Reacceleration and the Curved Radio Spectrum of the Radio Relic in the Sausage Cluster
• $Suzaku$ and $XMM-Newton$ observations of a newly-discovered early-stage cluster merger 1E2216.0-0401 and 1E2215.7-0404

Cited by in corpus (5)

• Formation of the young compact cluster GM 24 triggered by a cloud-cloud collision
• SoUthern Cluster sCale Extended Source Survey (SUCCESS): A GMRT and MeerKAT study of nine massive galaxy clusters
• Diffuse radio source candidate in CIZA J1358.9-4750
• Discovery of Radio Jets in Phoenix Galaxy Cluster Center
• Radio broadband visualization of global three-dimensional magneto-hydrodynamical simulations of spiral galaxies II. Faraday Depolarization from 100MHz to 10GHz