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We readdress the calculation of the mass of early-type galaxies using stronggravitational lensing and stellar dynamics. Our sample comprises 27 galaxies inthe Sloan Lens ACS (SLACS) Survey. Comparing the mass estimates from these twoindependent methods in a Bayesian framework, we find evidence of significantline-of-sight mass contamination. Assuming a power-law mass distribution, thebest fit density profile is given by $\rho \propto r^{-1.69\pm0.05}$. We showthat neglecting the line-of-sight mass contamination produces an overestimateof the mass attributed to the lens-galaxy by the lensing method, whichintroduces a bias in favor of a SIS profile when using the joint lensing anddynamic analysis to determine the slope of the density profile. We suggest thatthe line-of-sight contamination could also be important for other astrophysicaland cosmological uses of joint lensing and dynamical measurements.

Bayesian analysis of joint strong gravitational lensing and dynamic galactic mass in SLACS: evidence of line-of-sight contamination