Globular clusters and dwarf galaxies in Fornax. I. Kinematics in the cluster core from multi-object spectroscopy

Details Globular clusters and dwarf galaxies in Fornax. I. Kinematics in the cluster core from multi-object spectroscopy Globular clusters and dwarf galaxies in Fornax. I. Kinematics in the cluster core from multi-object spectroscopy

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...464l..21b&link_type=abstract

Astronomy and Astrophysics, Volume 464, Issue 2, March III 2007, pp.L21-L24

Astronomy and Astrophysics

Astrophysics

15

Galaxies: Star Clusters, Galaxies: Kinematics And Dynamics, Galaxies: Elliptical And Lenticular, Cd, Galaxies: Dwarf, Galaxies: Individual: Fornax Cluster

Scientific paper

Aims:We acquired radial velocities of a significant number of globular clusters (GCs) on wide fields between galaxies in the nearby Fornax cluster of galaxies, in order to derive their velocity dispersion radial profile and to probe the dynamics of the cluster. Methods: We used FLAMES on the VLT to obtain accurate velocities for 149 GCs, within a ≈500 × 150 kpc strip centered on NGC 1399, the Fornax central galaxy. These objects are at the very bright tail (MV ⪉ -9.5) of the GC luminosity function, overlapping the so-called "ultra-compact dwarfs" magnitude range. Eight of the brightest FLAMES-confirmed members indeed show hints of resolution in the subarcsecond pre-imaging data we used for selecting the ~500 targets for FLAMES spectroscopy. Results: Ignoring the GCs around galaxies by applying 3d25 diameter masks, we find 61 GCs of 20.0 ≤ V ≤ 22.2 lying in the intra-cluster (IC) medium. The velocity dispersion of the population of ICGCs is 200 km s-1 at ~150 kpc from the central NGC 1399 and rises to nearly 400 km s-1 at 200 kpc, a value which compares with the velocity dispersion of the population of dwarf galaxies, thought to be infalling from the surroundings of the cluster.
Based on observations collected at the ESO La Silla and Paranal observatories (programs 66.A-0345, 072.A-0389 and 074.A-0756). Tables [see full text]-[see full text] are only available in electronic form at http://www.aanda.org

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