The X-ray coolest gas in cool core clusters

We propose to continue our programme of deep RGS observations by observing thenext best three clusters spanning a range of redshift, luminosity andtemperature in order to make definitive statements about the range oftemperature in the clusters and the level of cooling. All three clusters havecool cores, short central cooling times and central radio sources. The mainspectral target is the FeXVII emission lines at 15 and 17A, the ratio of whichdepends on the gas temperature in the 37 million K range. In the case of A1835we shall for the first time probe mass cooling rates similar to the observedstar formation rate. These observations will exploit the unique capability ofthe RGS, and build on one of XMM.s major discoveries. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]