Recent observations reveal detailed structures of mergers in galaxy clusters. Moving cold fronts could be identified as remnants of subclusters. They are believed to mark the late stage of a merging process. Dynamics, geometry and extension of the subclusters can be very different: Spherically shaped bodies with a radius of $\approx 20 kpc$ up to $\approx 400 kpc$ and Mach numbers between $\mathcal{ M}\approx 0.4$ and $\mathcal{ M}\approx 1.5$ are observed. In order to analyse the Sunyaev-Zeldovich (SZ) signal, we calculate the modified pressure profile for an ongoing merger.
Categories: astro-ph