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

Abstract

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.

12 pages, 10 figures, accepted MNRAS

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Cited by in corpus (8)

• Star Clusters in M31: VII. Global Kinematics and Metallicity Subpopulations of the Globular Clusters
• Forming Lenticular Galaxies via Violent Disk Instability
• The SLUGGS survey: Using extended stellar kinematics to disentangle the formation histories of low mass S0 galaxies
• The SLUGGS survey: combining stars, globular clusters and planetary nebulae to understand the assembly history of early-type galaxies from their large radii kinematics
• The assembly history of the nearest S0 galaxy NGC 3115 from its kinematics out to six half-light radii
• Chromodynamical Analysis of Lenticular Galaxies using Globular Clusters and Planetary Nebulae
• The complex globular cluster system of the S0 galaxy NGC 4382 in the outskirts of the Virgo Cluster
• J-PLUS: Detecting and studying extragalactic globular clusters -- the case of NGC 1023