A deep XMM view of the violent low-mass merger XLSSC 105

We propose a deep XMM observation of the 1e14 Msun cluster XLSSC 105 at z0.43,which exhibits clear merging signatures in existing multiwavelength data. Thetwo peaks revealed by highresolution SZ data do not have obvious counterpartsin the existing shallow XMM data, which implies that this system is ahighvelocity headon merger along the plane of the sky. The two SZ peaks likelycoincide with hightemperature (>virgul20 keV) shockheated regions. We propose adeep (175 ks) XMM observation of this system to measure the temperature of thegas in the shocked regions and constrain the geometry of the merger, togetherwith a joint 70ks Chandra highresolution observation to detect the densityjumps. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]