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We present structural measurements for the galaxies in the 0.05<z<0.0585groups of the Zurich Environmental Study, aimed at establishing how galaxyproperties depend on four environmental parameters: group halo mass M_GROUP,group-centric distance R/R_200, ranking into central or satellite, andlarge-scale structure density delta_LSS. Global galaxy structure is quantifiedboth parametrically and non-parametrically. We correct all these measurementsfor observational biases due to PSF blurring and surface brightness effects asa function of galaxy size, magnitude, steepness of light profile andellipticity. Structural parameters are derived also for bulges, disks and bars.We use the galaxy bulge-to-total ratios (B/T), together with the calibratednon-parametric structural estimators, to implement a quantitative morphologicalclassification that maximizes purity in the resulting morphological samples. Weinvestigate how the concentration C of satellite galaxies depends on galaxymass for each Hubble type, and on M_GROUP, R/R_200 and delta_LSS. At galaxymasses M>10^10 M_sun, the concentration of disk satellites increases withincreasing stellar mass, separately within each morphological bin of B/T. Theknown increase in concentration with stellar mass for disk satellites is thusdue, at least in part, to an increase in galaxy central stellar density atconstant B/T. The correlation between concentration and galaxy stellar massbecomes progressively steeper for later morphological types. The concentrationof disk satellites shows a barely significant dependence on delta_LSS orR/R_200. The strongest environmental effect is found with group mass forM>10^10 M_sun disk-dominated satellites, which are ~10% more concentrated inhigh mass groups than in lower mass groups.

astrophysical journal/the astrophysical journal

The Zurich Environmental Study (ZENS) of Galaxies in Groups along the  Cosmic Web. II. Galaxy Structural Measurements and the Concentration of  Morphologically Classified Satellites in Diverse Environments