The Fornax Cluster VLT Spectroscopic Survey III -- Kinematical characterisation of globular clusters across the Fornax galaxy cluster

Abstract

The Fornax cluster provides an unparalleled opportunity to investigate in detail the formation and evolution of early-type galaxies in a dense environment. We aim at kinematically characterizing photometrically detected globular cluster (GC) candidates in the core of the cluster. We used the VLT/VIMOS spectroscopic data from the FVSS survey in the Fornax cluster, covering one square degree around the central massive galaxy NGC 1399. We confirmed a total of 777 GCs, almost doubling the previously detected GCs, using the same dataset by Pota et al. (2018). Combined with previous literature radial velocity measurements of GCs in Fornax, we compiled the most extensive spectroscopic GC sample of 2341 objects in this environment. We found that red GCs are mostly concentrated around major galaxies, while blue GCs are kinematically irregular and are widely spread throughout the core region of the cluster. The velocity dispersion profiles of blue and red GCs show a quite distinct behaviour. Blue GCs exhibit a sharp increase in the velocity dispersion profile from 250 to 400km/s within 5 arcminutes (29 kpc/1 reff of NGC 1399) from the central galaxy. The velocity dispersion profile of red GCs follows a constant value in between 200-300km/s until 8 arcminutes (46 kpc/1.6reff), and then rises to 350km/s at 10 arcminutes (58 kpc/2 reff). Beyond 10 arcminutes and out to 40 arcminutes (230 kpc/8 reff), blue and red GCs show a constant velocity dispersion of 300+/-50km/s, indicating that both GC populations are tracing the cluster potential. We have kinematically confirmed and characterized the previously photometrically discovered overdensities of intra-cluster GCs. We found that those substructured intra-cluster regions in Fornax are dominated mostly by blue GCs.

22 Pages, 22 Figures. Accepted for publication in Astronomy and Astrophysics

References in corpus (27)

• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• UV-extended E-MILES stellar population models: young components in massive early-type galaxies
• Kinematic properties of early-type galaxy haloes using planetary nebulae
• Building Late-Type Spiral Galaxies by In-Situ and Ex-Situ Star Formation
• The ACS Fornax Cluster Survey. I. Introduction to the Survey and Data Reduction Procedures
• Dynamical masses of ultra-compact dwarf galaxies in Fornax
• The build-up of the cD halo of M87 - evidence for accretion in the last Gyr
• A discrete chemo-dynamical model of the dwarf spheroidal galaxy Sculptor: mass profile, velocity anisotropy and internal rotation
• The Fornax3D project: Tracing the assembly history of the cluster from the kinematic and line-strength maps
• Virgo's Intracluster Globular Clusters as Seen by the Advanced Camera for Surveys
• Gas sloshing regulates and records the evolution of the Fornax Cluster
• The Fornax Deep Survey with VST. IX. The catalog of sources in the FDS area, with an example study for globular clusters and background galaxies
• Compact Stellar Systems around NGC 1399
• Galaxy Cluster Mass Reconstruction Project: III. The impact of dynamical substructure on cluster mass estimates
• Intra Cluster Globular Clusters around NGC 1399 in Fornax?
• Counter-dispersed slitless-spectroscopy technique: planetary nebula velocities in the halo of NGC 1399
• A discrete chemo-dynamical model of the giant elliptical galaxy NGC 5846: dark matter fraction, internal rotation and velocity anisotropy out to six effective radii
• To the Edge of M87 and Beyond: Spectroscopy of Intracluster Globular Clusters and Ultra Compact Dwarfs in the Virgo Cluster
• The PIPER Survey: I. An Initial Look at the Intergalactic Globular Cluster Population in the Perseus Cluster
• Tidal origin of NGC 1427A in the Fornax cluster
• The SLUGGS survey: combining stars, globular clusters and planetary nebulae to understand the assembly history of early-type galaxies from their large radii kinematics
• A discrete chemo-dynamical model of M87's globular clusters: Kinematics extending to ~ 400 kpc
• Compact stellar systems in the Fornax cluster: a UV perspective
• The colour-magnitude relation of Globular Clusters in Centaurus and Hydra - Constraints on star cluster self-enrichment with a link to massive Milky Way GCs
• The Fornax Cluster VLT Spectroscopic Survey IV -- Cold kinematical substructures in the Fornax core from COSTA
• Astroinformatics based search for globular clusters in the Fornax Deep Survey
• A 3D view of the Hydra I galaxy cluster core - I. Kinematic substructures

Cited by in corpus (18)

• Euclid: Early Release Observations -- Globular clusters in the Fornax galaxy cluster, from dwarf galaxies to the intracluster field
• Kinematics of the diffuse intragroup and intracluster light in groups and clusters of galaxies in the Local Universe within 100 Mpc distance
• The SAMI -- Fornax Dwarfs Survey II: The Stellar Mass Fundamental Plane and the Dark Matter fraction of Dwarf Galaxies
• The Fornax3D project: The assembly history of massive early-type galaxies in the Fornax cluster from deep imaging and integral field spectroscopy
• The Fornax Cluster VLT Spectroscopic Survey IV -- Cold kinematical substructures in the Fornax core from COSTA
• Euclid preparation. LVIII. Detecting globular clusters in the Euclid survey
• New Velocity Measurements of NGC 5128 Globular Clusters out to 130 kpc: Outer Halo Kinematics, Substructure and Dynamics
• Spatial Structures in the Globular Cluster Distribution of Fornax Cluster Galaxies
• The SRG/eROSITA all-sky survey: View of the Fornax galaxy cluster
• Shapes of dark matter haloes with discrete globular cluster dynamics: The example of NGC 5128 (Centaurus A)
• Total mass slopes and enclosed mass constrained by globular cluster system dynamics
• The turbulent life of NGC 4696 as told by its globular cluster system
• Properties of Globular Clusters in Galaxy Clusters: Sensitivity from the Formation and Evolution of Globular Clusters
• The galactic acceleration scale is imprinted on globular cluster systems of early-type galaxies of most masses and on red and blue globular cluster subpopulations
• Intracluster globular clusters as tracers of the mass assembly of the Hydra I galaxy cluster
• The contribution of the color space in LSST-like photometry for the selection of extragalactic globular cluster candidates
• Globular clusters in M104: Tracing kinematics and metallicities from the centre to the halo
• The Next Generation Fornax Survey (NGFS).VIII. A Support Vector Machine Approach for Disentangling Globular Clusters from other Sources