Systematic X-ray Analysis of Radio Relic Clusters with SUZAKU

Details Systematic X-ray Analysis of Radio Relic Clusters with SUZAKU Systematic X-ray Analysis of Radio Relic Clusters with SUZAKU

2011-12-13

arxiv.org/abs/1112.3030v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 8 figures, submitted to PASJ

Scientific paper

We perform a systematic X-ray analysis of six giant radio relics of four clusters with Suzaku satellite by compiling new analysis of CIZA 2242.8-5301, Zwcl 2341.1-0000, and Abell 3667 and previous results of A3667 and A3376. Especially we first observed the narrow (~50 kpc) relic of CIZA 2242.8-5301 by Suzaku satellite, which enable us to reduce the projection effect. From the spectroscopic temperature profiles across the relic, we find that temperature profiles exhibits significant jumps across the relics for CIZA 2242.8-5301, A3376, A3667NW and A3667SE. We evaluated the Mach number from X-ray temperature or pressure with the Rankine-Hugoniot jump condition and compared with the Mach number from radio spectrum index. The resultant Mach numbers (M= 1.5-3) are almost consistent with each other, while the Mach number of CIZA2242 from X-ray tends to be lower than that of the radio observation. These results of the systematic analysis can be interpreted as the giant radio relics in merging clusters being related to the strong shock structure, as suggested by previous studies of the analysis of an individual cluster. We also discuss the non equilibrium state of the electron temperature and the average temperature at the radio relic.

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