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We present recent high angular resolution (9") Sunyaev-Zel'dovich effect(SZE) observations with MUSTANG, a 90-GHz bolometric receiver on the Green BankTelescope. MUSTANG has now imaged several massive clusters of galaxies in someof the highest-resolution SZE imaging to date, revealing complex pressuresubstructure within the hot intra-cluster gas in merging clusters. We focus onthree merging, intermediate redshift clusters here: MACS J0744.8+3927, MACSJ0717.5+3745, RX J1347.5-1145. In one of these merging clusters, MACSJ0744.8+3927, the MUSTANG observation has revealed shocked gas that waspreviously undetected in X-ray observations. Our preliminary results for MACSJ0717.5+3745 demonstrate the complementarity these observations provide whencombined with X-ray observations of the thermal emission and radio observationsof the non-thermal emission. And finally, by revisiting RX J1347.5-1145, wenote an inter- esting correlation between its radio emission and the SZE data.While observations of the thermal SZE probe the line of sight integral ofthermal electron pressure through a cluster, these redshift independentobservations hold great potential for aiding the interpretation of non-thermalastrophysics in high-z clusters.

New High-Resolution Sunyaev-Zel'dovich Observations with GBT+MUSTANG