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We search for bulk motions in the intracluster medium (ICM) of massiveclusters showing evidence of an ongoing or recent major merger with spatiallyresolved spectroscopy in {\sl Chandra} CCD data. We identify a sample of 6merging clusters with $>$150 ks {\sl Chandra} exposure in the redshift range$0.1 < z < 0.3$. By performing X-ray spectral analysis of projected ICM regionsselected according to their surface brightness, we obtain the projectedredshift maps for all of these clusters. After performing a robust analysis ofthe statistical and systematic uncertainties in the measured X-ray redshift$z_{\rm X}$, we check whether or not the global $z_{\rm X}$ distributiondiffers from that expected when the ICM is at rest. We find evidence ofsignificant bulk motions at more than 3$\sigma$ in A2142 and A115, and lessthan 2$\sigma$ in A2034 and A520. Focusing on single regions, we identifysignificant localized velocity differences in all of the merging clusters. Wealso perform the same analysis on two relaxed clusters with no signatures ofrecent mergers, finding no signs of bulk motions, as expected. Our resultsindicate that deep {\sl Chandra} CCD data enable us to identify the presence ofbulk motions at the level of $v_{\rm BM} >$ 1000\ ${\rm km\ s^{-1}}$ in the ICMof massive merging clusters at $0.1<z<0.3$. Although the CCD spectralresolution is not sufficient for a detailed analysis of the ICM dynamics, {\slChandra} CCD data constitute a key diagnostic tool complementing X-raybolometers on board future X-ray missions.

Searching for bulk motions in the ICM of massive, merging clusters with Chandra CCD data