We report on an investigation of the environments of the SLACS sample of
gravitational lenses. The local and global environments of the lenses are
characterized using SDSS photometry and, when available, spectroscopy. We find
that the lens systems that are best modelled with steeper than isothermal
density profiles are more likely to have close companions than lenses with
shallower than isothermal profiles. This suggests that the profile steepening
may be caused by interactions with a companion galaxy as indicated by N-body
simulations of group galaxies. The global environments of the SLACS lenses are
typical of non-lensing SDSS galaxies with comparable properties to the lenses,
and the richnesses of the lens groups are not as strongly correlated with the
lens density profiles as the local environments. Furthermore, we investigate
the possibility of line-of-sight contamination affecting the lens models but do
not find a significant over-density of sources compared to lines of sight
without lenses.Comment: 5 pages, 4 figures, accepted for publication in MNRA