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We present evidence for the existence of significant substructure in the coldfront cluster Abell 3667 based on multi-object spectroscopy taken with the 3.9mAnglo Australian Telescope. This paper is the second in a series analyzing therelationship between cold fronts observed in Chandra X-ray images and mergeractivity observed at optical wavelengths. We have obtained 910 galaxy redshiftsin the field of Abell 3667 out to 3.5 Mpc, of which 550 are confirmed clustermembers, more than doubling the number of spectroscopically confirmed memberspreviously available and probing some 3 mag down the luminosity function. Fromthis sample, we derive a cluster redshift of z=0.0553 +/-0.0002 and velocitydispersion of 1056 +/- 38 km/s and use a number of statistical tests to searchfor substructure. We find significant evidence for substructure in the spatialdistribution of member galaxies and also in the localized velocitydistributions and, in spite of this evidence, find the global velocitydistribution does not deviate significantly from a Gaussian. Using combinedspatial and velocity information, we find the cluster can be separated into twomajor structures, with roughly equal velocity dispersions, but offset inpeculiar velocity from each other by ~500 km/s, and a number of minorsubstructures. We propose two scenarios which explain the radio and X-rayobservations. Our data show the cold front is directly related to clustermerger activity, and also highlights the extent of optical data required tounambiguously detect the presence of substructure.

Substructure in the cold front cluster Abell 3667