Suzaku broad-band spectroscopy of RX J1347.5-1145: constraints on the extremely hot gas and non-thermal emission

Abstract

We present the results from the analysis of long Suzaku observations of the most X-ray luminous galaxy cluster RX J1347.5-1145 at z=0.451. Aims: We study physical properties of the hot (~20 keV) gas clump in the south-east (SE) region discovered by the Sunyaev-Zel'dovich (SZ) effect observations, to understand the gas physics of a violent cluster merger. We also explore a signature of non-thermal emission using the hard X-ray data. Results: We find that the single-temperature model fails to reproduce the continuum emission and Fe-K lines measured by XIS simultaneously. The two-temperature model with a very hot component improves the fit, although the XIS data can only give a lower bound on its temperature. We detect the hard X-ray emission in the 12-40 keV band at the 7 sigma level; however, the significance becomes marginal when the systematic error in the background estimation is included. With the Suzaku + Chandra joint analysis, we determine the temperature of the SE excess component to be 25.3^{+6.1}_{-4.5} ^{+6.9}_{-9.5} keV (90% statistical and systematic errors), which is in an excellent agreement with the previous SZ + X-ray analysis. This is the first time that the X-ray spectroscopy alone gives a good measurement of the temperature of the hot component in the SE region, which is made possible by Suzaku's unprecedented sensitivity to the wide X-ray band. These results strongly indicate that the cluster has undergone a recent, violent merger. The spectral analysis shows that the SE component is consistent with being thermal. We find the 3 sigma upper limit on the non-thermal flux, F < 8e-12 erg s^{-1} cm^{-2} in the 12-60 keV band. Combining this limit with a recent discovery of the radio mini halo at 1.4 GHz, we find a lower limit on the strength of the intracluster magnetic field, B > 0.007 micro G.

arXiv comment15 pages, 13 figures. Accepted for publication in A&A

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• Substructures revealed by the Sunyaev-Zel'dovich effect at 150GHz in the high resolution map of RXJ1347-1145
• Restoring the Suzaku Source Position Accuracy and Point-Spread Function
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• Back-in-time dynamics of the cluster IE 0657-56 (the Bullet System)

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• Constraints on turbulent velocity broadening for a sample of clusters, groups and elliptical galaxies using XMM-Newton
• Cosmological and Astrophysical Implications of the Sunyaev-Zel'dovich Effect
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• The Sunyaev-Zel'dovich Effect at Five Arc-seconds: RXJ1347.5-1145 Imaged by ALMA
• Sloshing Gas in the Core of the Most Luminous Galaxy Cluster RXJ1347.5-1145
• Galaxy Cluster Pressure Profiles as Determined by Sunyaev Zel'dovich Effect Observations with MUSTANG and Bolocam II: Joint Analysis of Fourteen Clusters
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• A joint ALMA-Bolocam-Planck SZ study of the pressure distribution in RX J1347.5-1145
• The Cosmic Web and galaxy evolution around the most luminous X-ray cluster: RXJ1347.5-1145
• Discovery of the correspondence between intra-cluster radio emission and a high pressure region detected through the Sunyaev-Zel'dovich effect
• Large-scale Structure and Dynamics of the Most X-ray Luminous Galaxy Cluster Known -- RX J1347-1145
• Suzaku Observations of Iron K-lines from the Intracluster Medium of the Coma Cluster
• X-ray Spectroscopy of Clusters of Galaxies
• Investigating the hard X-ray emission from the hottest Abell cluster A2163 with Suzaku
• Non-Equilibrium Ionization State and Two-Temperature Structure in the Bullet Cluster 1E0657-56
• Merger Hydrodynamics of the Luminous Cluster RXJ1347.5-1145
• Search for a Non-equilibrium Plasma in the Merging Galaxy Cluster Abell 754
• Combining Optical and X-ray Observations of Galaxy Clusters to Constrain Cosmological Parameters
• Imaging Simulations of the Sunyaev-Zel'dovich Effect for ALMA
• The Radial Dependence of Temperature and Iron Abundance: Galaxy Clusters from z=0.14 to z=0.89
• Suzaku and Chandra observations of the galaxy cluster RXC J1053.7+5453 with a radio relic
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• Discovery of large-scale radio emission enveloping the mini-halo in the most X-ray luminous galaxy cluster RX~J1347.5-1145