Measuring sloshing, merging and feedback velocities in Galaxy clusters
Abstract
The intracluster medium (ICM) velocity structure is important to understand cluster physics for several reasons: it affects the cluster mass estimates, help to constrain AGN feedback models, can probe the viscosity of the gas, regulate the transport of metals within the ICM and directly measure the sloshing of gas in cold fronts. However, there are few direct measurements of the ICM velocity structure, despite its importance for understanding cluster physics. In this talk I will present the analysis of long exposure XMM-Newton X-ray observations of the Virgo, Centaurus and Ophiuchus Galaxy clusters, using a novel technique which consist of using background X-ray lines seen in the spectra of the XMM-Newton EPIC-pn detector to calibrate the absolute energy scale of the detector. This technique allows us to obtain velocity measurements with unprecedented accuracy down to 100 km/s. Such measurements allow us to better understand the AGN playing role in the ICM velocity structure.
- Publication:
-
44th COSPAR Scientific Assembly. Held 16-24 July
- Pub Date:
- July 2022
- Bibcode:
- 2022cosp...44.2341G