The structure of large-scale stellar disks in cluster lenticular
  galaxies
  By obtaining imaging data in two photometric bands for 60 lenticular galaxies
- members of 8 southern clusters - with the Las Cumbres Observatory one-meter
telescope network, we have analyzed the structure of their large-scale stellar
disks. The parameters of radial surface-brightness profiles have been
determined (including also disk thickness), and all the galaxies have been
classified into pure exponential (Type I) disk surface-brightness profiles,
truncated (Type II) and antitruncated (Type III) piecewise exponential disk
surface-brightness profiles. We confirm the previous results of some other
authors that the proportion of surface-brightness profile types is very
different in environments of different density: in the clusters the Type-II
profiles are almost absent while according to the literature data, in the field
they constitute about one quarter of all lenticular galaxies. The Type-III
profiles are equally presented in the clusters and in the field, while
following similar scaling relations; but by undertaking an additional
structural analysis including the disk thickness determination we note that
some Type-III disks may be a combination of a rather thick exponential
pseudobulge and an outer Type-I disk. Marginally we detect a shift of the
scaling relation toward higher central surface brightnesses for the outer
segments of Type-III disks and smaller thickness of the Type-I disks in the
clusters. Both effects may be explained by enhanced radial stellar migration
during disk galaxy infall into a cluster that in particular represents an
additional channel for Type-I disk shaping in dense environments.
