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(abridged) We utilize existing imaging and spectroscopic data for the galaxyclusters MS2137-23 and Abell 383 to present improved measures of thedistribution of dark and baryonic material in the clusters' central regions.Our method, based on the combination of gravitational lensing and dynamicaldata, is uniquely capable of separating the distribution of dark and baryoniccomponents at scales below 100 kpc. We find a variety of strong lensing modelsfit the available data, including some with dark matter profiles as steep asexpected from recent simulations. However, when combined with stellar velocitydispersion data for the brightest member, shallower inner slopes than predictedby numerical simulations are preferred. For Abell 383, the preferred shallowinner slopes are statistically a good fit only when the multiple image positionuncertainties associated with our lens model are assumed to be 0\farcs5, toaccount for unknown substructure. No statistically satisfactory fit wasobtained matching both the multiple image lensing data and the velocitydispersion profile of the brightest cluster galaxy in MS2137-23. This suggeststhat the mass model we are using, which comprises a pseudo-ellipticalgeneralized NFW profile and a brightest cluster galaxy component mayinadequately represent the inner cluster regions. This may plausibly arise dueto halo triaxiality or by the gravitational interaction of baryons and darkmatter in cluster cores. However, the progress made via this detailed studyhighlights the key role that complementary observations of lensed features andstellar dynamics offer in understanding the interaction between dark andbaryonic matter on non-linear scales in the central regions of clusters.

Separating baryons and dark matter in cluster cores: a full 2-D lensing and dynamic analysis of Abell 383 and MS2137-23