Turbulence in galaxy clusters - a new capability for the RGS

We propose to observe five moderate redshift cool core clusters to takeadvantage of a recently confirmed capability of the RGS instruments, to measureor place limits on the amount of turbulence in cluster cores. Our targets havebright cores and are at moderate redshift, so the degree of spatial broadeningon the spectra will be low, and we will be able to measure or place tight limitson the velocity broadening in each object (less than 300 km/s). We will be ableto place limits of 916 per cent on the fraction of turbulent pressure of thetotal pressure. An important secondary objective will be to study AGN feedbackin luminous cluster cores. We will be able to determine whether AGN feedbackmatches cooling to better than 10 per cent. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]