088081

We propose to observe a cool core cluster of modest X-ray luminosity which has over 10elev10 Msun of cold molecular gas in its X-ray cool core. ALMA data indicate that the cold gas is exceptionally disturbed and situated 5 kpc from the nucleus. If comma as Hitomi has shown in the Perseus cluster comma the cold gas and ICM share the same velocity field comma then we shall measure velocity broadening of the X-ray emission lines with the XMM RGS. Star formation of about 40 Msunpyr is inferred from optical and IR data and a central cooling time of less than 5x10elev6 yr. A cooling flow at that rate will be detectable.