Suzaku Observation of the Radio Halo Cluster Abell 2319: Gas Dynamics and Hard X-ray Properties

Abstract

We present the results of Suzaku observation of the radio halo cluster Abell 2319. The metal abundance in the central cool region is found to be higher than the surrounding region, which was not resolved in the former studies. We confirm that the line-of-sight velocities of the intracluster medium in the observed region are consistent with those of the member galaxies of entire A2319 and A2319A subgroup for the first time, though any velocity difference within the region is not detected. On the other hand, we do not find any signs of gas motion relevant to A2319B subgroup. Hard X-ray emission from the cluster is clearly detected, but its spectrum is likely thermal. Assuming a simple single temperature model for the thermal component, we find that the upper limit of the non-thermal inverse Compton component becomes $2.6\times 10^{-11}$ erg s${}^{-1}$ cm${}^{-2}$ in the 10-40 keV band, which means that the lower limit of the magnetic field is 0.19 $\mu$G with the radio spectral index 0.92. Although the results slightly depend on the detailed spectral modeling, it is robust that the upper limit of the power-law component flux and lower limit of the magnetic field strength become $\sim 3\times 10^{-11}$ erg s${}^{-1}$ cm${}^{-2}$ and $\sim 0.2\mu$G, respectively. Considering the lack of a significant amount of very hot ($\sim 20$ keV) gas and the strong bulk flow motion, it is more likely that the relativistic non-thermal electrons responsible for the radio halo are accelerated through the intracluster turbulence rather than the shocks.

12 pages, 15 figures, accepted for publication in PASJ

References in corpus (14)

• Hard X-ray Detector (HXD) on Board Suzaku
• Reproducibility of Non-X-ray Background for the X-ray Imaging Spectrometer aboard Suzaku
• In-Orbit Performance of the Hard X-ray Detector on board Suzaku
• The intracluster magnetic field power spectrum in Abell 2255
• Galaxy Clusters in the Swift/BAT era: Hard X-rays in the ICM
• Suzaku Observation of the Ophiuchus Galaxy Cluster: One of the Hottest Cool Core Clusters
• Three-dimensional Magnetohydrodynamic Simulations of Cold Fronts in Magnetically Turbulent ICM
• Hard X-ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku
• Suzaku Observations of the Centaurus Cluster: Absence of Bulk Motions in the Intracluster Medium
• A Suzaku Search for Non-thermal Emission at Hard X-ray Energies in the Coma Cluster
• Suzaku broad-band spectroscopy of RX J1347.5-1145: constraints on the extremely hot gas and non-thermal emission
• Nonthermal hard X-ray excess in the Coma cluster: resolving the discrepancy between the results of different PDS data analyses
• N-body + Magnetohydrodynamical Simulations of Merging Clusters of Galaxies: Characteristic Magnetic Field Structures Generated by Bulk Flow Motion
• Constraint of Non-thermal X-ray Emission from the On-going Merger Cluster Abell 3376 with Suzaku

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