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We present a new Chandra X-ray observation of the off-axis galaxy groupmerger RXJ0751.3+5012. The hot atmospheres of the two colliding groups appearhighly distorted by the merger. The images reveal arc-like cold fronts aroundeach group core, produced by the motion through the ambient medium, and thefirst detection of a group merger shock front. We detect a clear density andtemperature jump associated with a bow shock of Mach number M=1.9+/-0.4 aheadof the northern group. Using galaxy redshifts and the shock velocity of1100+/-300 km/s, we estimate that the merger axis is only 10deg from the planeof the sky. From the projected group separation of 90 kpc, this corresponds toa time since closest approach of 0.1 Gyr. The northern group hosts a dense,cool core with a ram pressure stripped tail of gas extending 100 kpc. Thesheared sides of this tail appear distorted and broadened by Kelvin-Helmholtzinstabilities. We use the presence of this substructure to place an upper limiton the magnetic field strength and, for Spitzer-like viscosity, show that thedevelopment of these structures is consistent with the critical perturbationlength above which instabilities can grow in the intragroup medium. Thenorthern group core also hosts a galaxy pair, UGC4052, with a surrounding IRand near-UV ring 40 kpc in diameter. The ring may have been produced by tidalstripping of a smaller galaxy by UGC4052 or it may be a collisional ringgenerated by a close encounter between the two large galaxies.

The bow shock, cold fronts and disintegrating cool core in the merging galaxy group RXJ0751.3+5012