SZ-X-ray Surface Brightness Fluctuations in the SPT-XMM clusters

Understand

The hot plasma in galaxy clusters, the intracluster medium (ICM), is expected to be shaped by subsonic turbulent motions, which are key for heating, cooling, and transport mechanisms.

• The turbulent motions contribute to the non-thermal pressure which, if not accounted for, consequently imparts a hydrostatic mass bias.
• Accessing information about turbulent motions is thus of major astrophysical and cosmological interest.
• Characteristics of turbulent motions can be indirectly accessed through surface brightness fluctuations.