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We investigate the strong lensing properties of the Sersic profile as analternative to the NFW profile, focusing on applications to lens modelling ofclusters. Given an underlying Sersic dark matter profile, we study whether anNFW profile can provide an acceptable fit to strong lensing constraints in theform of single or multiple measured Einstein radii. We conclude that althoughan NFW profile that fits the lensing constraints can be found in many cases,the derived parameters may be biased. In particular, we find that for n~2,which corresponds to massive clusters, the mass at r_200 of the best fit NFW isoverestimated (by a factor of ~2) and the concentration is very low (c~2). Thedifferences are important enough to warrant the inclusion of Sersic profile forfuture analysis of strong lensing clusters.

A comparison of the strong lensing properties of the Sersic and the NFW profiles