Spatial distribution of GC systems in early-type gal.

We describe the procedure used to select GC candidates and fit the spatial distributions of GCs to a two-dimensional Sersic function, which provides effective radii (half number radii) and Sersic indices, and estimate background contamination by adding a constant term to the Sersic function.

In cases where a neighboring galaxy affects the estimation of the GC spatial distribution in the target galaxy, we fit two two-dimensional Sersic functions, simultaneously. We also investigate the color distributions of GCs in our sample by using Gaussian mixture modeling. For GC systems with bimodal color distributions, we divide the GCs into blue and red subgroups and fit their respective spatial distributions with Sersic functions.