088119

We propose mosaic observations of the massive comma early-stage comma binary merging cluster Abell 401 to probe the ICM out to the virial radius with essentially full azimuthal coverage. Simulations of structure formation predict relatively large numbers of cool gas clumps in such systems comma with more clumps expected along filaments. Abell 401-Abell 399 is a perfect example of such a system comma with the only intercluster filament detected by Planck. We will apply the X-COP method of combining X-ray and SZ observations to accurately determine the thermodynamic profiles of the ICM comma with and without d_commaclump filteringd_comma comma to measure the clumping factor and fraction of non-thermal pressure support both along and away from the putative cosmic filament and compare the results with expectations from simulations.