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We analyze a new gravitational lens, OAC-GL J1223-1239, serendipitously foundin a deep I-band image of the Hubble Space Telescope (HST) Advanced Camera forSurveys (ACS). The lens is a L_*, edge-on S0 galaxy at z=0.4656. Thegravitational arc has a radius of 0.42 arcsec. We have determined the totalmass and the dark matter (DM) fraction within the Einstein radius as a functionof the lensed source redshift, which is presently unknown. For z ~ 1.3, whichis in the middle of the redshift range plausible for the source according tosome external constraints, we find the central velocity dispersion to be ~180km/s. With this value, close to that obtained by means of the Faber-Jacksonrelation at the lens redshift, we compute a 30% DM fraction within the Einsteinradius (given the uncertainty in the source redshift, the allowed range for theDM fraction is 25-35 % in our lensing model). When compared with the galaxiesin the local Universe, the lensing galaxy, OAC-GL J1223-1239 seems to fall inthe transition regime between massive DM dominated galaxies and lower-mass, DMdeficient systems.

Gauging the dark matter fraction in a $L_*$ S0 galaxy at z=0.47 through gravitational lensing from deep HST/ACS imaging