The SLUGGS survey: chromo-dynamical modelling of the lenticular galaxy
  NGC 1023
  Globular clusters (GCs) can be considered discrete, long-lived, dynamical
tracers that retain crucial information about the assembly history of their
parent galaxy. In this paper, we present a new catalogue of GC velocities and
colours for the lenticular galaxy NGC 1023, we study their kinematics and
spatial distribution, in comparison with the underlying stellar kinematics and
surface brightness profile, and we test a new method for studying GC
properties. Specifically, we decompose the galaxy light into its spheroid
(assumed to represent the bulge + halo components) and disk components and use
it to assign to each GC a probability of belonging to one of the two
components. Then we model the galaxy kinematics, assuming a disk and spheroidal
component, using planetary nebulae (PNe) and integrated stellar light. We use
this kinematic model and the probability previously obtained from the
photometry to recalculate for each GC its likelihood of being associated with
the disk, the spheroid, or neither. We find that the reddest GCs are likely to
be 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 of
blue 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 in
equilibrium with the system. In NGC1023 some of the rejected GCs form a
substructure in phase space that is connected with NGC 1023 companion galaxy.
