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Strong gravitational lensing can be used to directly measure the massfunction of their satellites, thus testing one of the fundamental predictionsof cold dark matter cosmological models. Given the importance of this test itis essential to ensure that galaxies acting as strong lenses have dark andluminous satellites which are representative of the overall galaxy population.We address this issue by measuring the number and spatial distribution ofluminous satellites in ACS imaging around lens galaxies from the Sloan LensAdvanced Camera for Surveys (SLACS) lenses, and comparing them with thesatellite population in ACS imaging of non lens galaxies selected from COSMOS,which has similar depth and resolution to the ACS images of SLACS lenses. Inorder to compare the samples of lens and non lens galaxies, which haveintrinsically different stellar mass distributions, we measure, for the firsttime, the number of satellites per host as a continuous function of hoststellar mass for both populations. We find that the number of satellites as afunction of host stellar mass, as well as the spatial distribution areconsistent between the samples. Using these results, we predict the number ofsatellites we would expect to find around a subset of the Cosmic Lens All SkySurvey (CLASS) lenses, and find a result consistent with the the numberobserved by Jackson et al. 2010. Thus we conclude that within our measurementuncertainties there is no significant difference in the satellite populationsof lens and non lens galaxies.

Do gravitational lens galaxies have an excess of luminous substructure?