摘要：By obtaining imaging data in two photometric bands for 60 lenticular galaxies—members of eight southernclusters—with the Las Cumbres Observatory one-meter telescope network, we have analyzed the structure of theirlarge-scale stellar disks. The parameters of radial surface-brightness profiles have been determined (including alsodisk thickness), and all the galaxies have been classified into pure exponential (Type I) disk surface-brightnessprofiles, truncated (Type II) and antitruncated (Type III) piecewise exponential disk surface-brightness profiles. Weconfirm the previous results of some other authors that the proportion of surface-brightness profile types is verydifferent in environments of different density: in the clusters, the Type-II profiles are almost absent while accordingto the literature data, in the field they constitute about one-quarter of all lenticular galaxies. The Type-III profilesare equally presented in the clusters and in the field, while following similar scaling relations; but by undertakingan additional structural analysis including the disk thickness determination we note that some Type-III disks maybe a combination of a rather thick exponential pseudobulge and an outer Type-I disk. Marginally, we detect a shiftof the scaling relation toward higher central surface brightnesses for the outer segments of Type-III disks andsmaller thickness of the Type-I disks in the clusters. Both effects may be explained by enhanced radial stellarmigration during disk galaxy infall into a cluster that in particular represents an additional channel for Type-I diskshaping in dense environments.
关键词：galaxies: elliptical and lenticular: cD;galaxies: evolution;galaxies: formation;galaxies: structure
