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We examine the velocity width of cool X-ray emitting material usingXMM-Newton Reflection Grating Spectrometer (RGS) spectra of a sample ofclusters and group of galaxies and elliptical galaxies. Improving on ourprevious analyses, we apply a spectral model which accounts for broadening dueto the spatial extent of the source. With both conventional and Markov ChainMonte Carlo approaches we obtain limits, or in a few cases measurements, of thevelocity broadening of the coolest X-ray material. In our sample, we includenew observations targeting objects with compact, bright, line-rich cores. Oneof these, MACSJ2229.7-2755, gives a velocity limit of 280 km/s at the 90 percent confidence level. Other systems with limits close to 300 km/s includeA1835, NGC4261 and NGC4472. For more than a third of the targets we find limitsbetter than 500 km/s. HCG62, NGC1399 and A3112 show evidence for ~400 km/svelocity broadening. For a smaller sample of objects, we usecontinuum-subtracted emission line surface brightness profiles to account forthe spatial broadening. Although there are significant systematic errorsassociated with the technique (~150 km/s), we find broadening at the level of280 to 500 km/s in A3112, NGC1399 and NGC4636.

Velocity width measurements of the coolest X-ray emitting material in the cores of clusters, groups and elliptical galaxies