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To search for bulk motions of the intracluster medium, we analyzed the X-rayspectra taken with the Suzaku satellite and measured the Doppler shift of Fe-Kline emission from eight nearby clusters of galaxies with various X-raymorphologies. In the cores of the Centaurus and Perseus clusters, the gas bulkvelocity does not exceed the sound velocity, which confirms the results ofprevious research. For the Cen45 subcluster, we found that the radial velocityrelative to the Centaurus core, <780 km s^-1, is significantly smaller thanthat reported in the optical band at the 3.9 sigma level, which suggests anoffset between the gas and galaxy distributions along the line of sight due tothe subcluster merger. In A2199, A2142, A3667, and A133, no significant bulkmotion was detected, indicating an upper limit on the radial velocity of3000-4000 km s^-1. A sign of large bulk velocity in excess of the instrumentalcalibration uncertainty was found near the center of cool-core cluster A2029and in the subcluster of the merging cluster A2255, suggesting that thenonthermal pressure support is not negligible in estimating the totalgravitational mass of not only merging clusters but also relaxed clusters aspredicted by numerical simulations. To improve the significance of thedetection, however, a further examination by follow-up observations isrequired. The present study provides a pilot survey prior to the futurehigh-resolution spectroscopy with ASTRO-H, which is expected to play a criticalrole in revealing the dynamical evolutions of clusters.

Search for gas bulk motions in eight nearby clusters of galaxies with Suzaku