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We present the results of a study of weak gravitational lensing by galaxiesusing imaging data that were obtained as part of the second Red SequenceCluster Survey (RCS2). In order to compare to the baryonic properties of thelenses we focus here on the ~300 square degrees that overlap with the DR7 ofthe SDSS. The depth and image quality of the RCS2 enables us to significantlyimprove upon earlier work for luminous galaxies at z>=0.3. Comparison withdynamical masses from the SDSS shows a good correlation with the lensing massfor early-type galaxies. For low luminosity (stellar mass) early-type galaxieswe find a satellite fraction of ~40% which rapidly decreases to <10% withincreasing luminosity (stellar mass). The satellite fraction of the late-typeshas a value in the range 0-15%. We find that early-types in the range10^10<L_r<10^11.5 Lsun have virial masses that are about five times higher thanthose of late-type galaxies and that the mass scales as M_200 \propto L^2.34+0.09 \ -0.16. We also measure the virial mass-to-light ratio, and find forL_200<10^11 Lsun a value of M_200/L_200=42+-10 for early-types, which increasesfor higher luminosities to values that are consistent with those observed forgroups and clusters of galaxies. For late-type galaxies we find a lower valueof M_200/L_200=17+-9. Our measurements also show that early- and late-typegalaxies have comparable halo masses for stellar masses M_*<10^11 Msun, whereasthe virial masses of early-type galaxies are higher for higher stellar masses.Finally, we determine the efficiency with which baryons have been convertedinto stars. Our results for early-type galaxies suggest a variation inefficiency with a minimum of ~10% for a stellar mass M_*,200=10^12 Msun. Theresults for the late-type galaxies are not well constrained, but do suggest alarger value. (abridged)

Galaxy-galaxy lensing constraints on the relation between baryons and dark matter in galaxies in the Red Sequence Cluster Survey 2