088028

There are few direct measurements of the intracluster medium openParICMclosePar velocity structure comma despite its importance for understanding cluster physics. Velocities were measured in the Perseus cluster with the Hitomi observatory but due to its loss we will have to wait until the next generation of X-ray observatories to obtain such groundbreaking measurements. However comma it has been shown that the EPIC-pn energy scale can be calibrated with the Cu Ka instrumental line to measure bulk flows of the ICM. We propose deep observations of the Ophiuchus cluster openPar668 ksclosePar comma the second-brightest galaxy cluster in the X-ray sky comma to produce a high resolution map of the velocity structure of the ICM. Ophiuchus cluster is an excellent target to understand the heating-cooling physical processes involved.