We report on the first result concerning the Ophiuchus cluster of galaxies observed with ASCA during the performance-verification phase. The obtained image in the energy range of 0.7–10 keV is nearly circular, and the peak of the X-ray surface brightness is coincident with the position of the cD galaxy. We analyzed the ASCA GIS data within a 13′.8 radius of the cluster center while considering the energy-dependent flux-contaminated effect due to ASCA X-ray telescope. This data can be well explained with the isothermal β model, in which the density profile is expressed with a β profile of rcore = 3′.8 and β = 0.62, and the temperature and metal abundances are constant at kT = 9.8 keV and Z = 0.24 Z⊙. The central excess density profile obtained with Einstein HRI is also consistent with the ASCA GIS data.
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Matsuzawa et al. (1996) studied this question.