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Globular clusters (GCs) can be considered discrete, long-lived, dynamicaltracers that retain crucial information about the assembly history of theirparent galaxy. In this paper, we present a new catalogue of GC velocities andcolours for the lenticular galaxy NGC 1023, we study their kinematics andspatial distribution, in comparison with the underlying stellar kinematics andsurface brightness profile, and we test a new method for studying GCproperties. Specifically, we decompose the galaxy light into its spheroid(assumed to represent the bulge + halo components) and disk components and useit to assign to each GC a probability of belonging to one of the twocomponents. Then we model the galaxy kinematics, assuming a disk and spheroidalcomponent, using planetary nebulae (PNe) and integrated stellar light. We usethis kinematic model and the probability previously obtained from thephotometry to recalculate for each GC its likelihood of being associated withthe disk, the spheroid, or neither. We find that the reddest GCs are likely tobe associated with the disk, as found for faint fuzzies in this same galaxy,suggesting that the disk of this S0 galaxy originated at z ~ 2. The majority ofblue GCs are found likely to be associated with the spheroidal (hot) component.The method also allows us to identify objects that are unlikely to be inequilibrium with the system. In NGC1023 some of the rejected GCs form asubstructure in phase space that is connected with NGC 1023 companion galaxy.

The SLUGGS survey: chromo-dynamical modelling of the lenticular galaxy NGC 1023