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We report on the serendipitous discovery in the Blanco Cosmology Survey (BCS)imaging data of a z = 0.9057 galaxy that is being strongly lensed by a massivegalaxy cluster at a redshift of z=0.3838. The lens (BCS J2352-5452) wasdiscovered while examining i- and z-band images being acquired in October 2006during a BCS observing run. Follow-up spectroscopic observations with the GMOSinstrument on the Gemini South 8m telescope confirmed the lensing nature ofthis system. Using weak plus strong lensing, velocity dispersion, clusterrichness N_200, and fitting to an NFW cluster mass density profile, we havemade three independent estimates of the mass M_200 which are all veryconsistent with each other. The combination of the results from the threemethods gives M_200 = (5.1 +- 1.3) x 10^14 M_Sun, which is fully consistentwith the individual measurements. The final NFW concentration c_200 from thecombined fit is c_200 = 5.4(+1.4 -1.1). We have compared our measurements ofM_200 and c_200 with predictions for (a) clusters from Lambda_CDM simulations,(b) lensing selected clusters from simulations, and (c) a real sample ofcluster lenses. We find that we are most compatible with the predictions forLambda_CDM simulations for lensing clusters, and we see no evidence based onthis one system for an increased concentration compared to Lambda_CDM. Finally,using the flux measured from the [OII]3727 line we have determined the starformation rate (SFR) of the source galaxy and find it to be rather modest giventhe assumed lens magnification.

The serendipitous observation of a gravitationally lensed galaxy at z = 0.9057 from the Blanco Cosmology Survey: The Elliot Arc