A 3D view of the Hydra I galaxy cluster core - I. Kinematic substructures. Issue Volume 10:Issue S309(2014) (9th February 2015)

• Record Type: Journal Article
• Authors: Hilker, Michael; Barbosa, Carlos Eduardo; Richtler, Tom; Coccato, Lodovico; Arnaboldi, Magda; de Oliveira, Claudia Mendes
• Editors: Ziegler, Bodo L.; Combes, Françoise; Dannerbauer, Helmut; Verdugo, Miguel
• Is Part Of: Proceedings of the International Astronomical Union. Volume 10:Issue S309(2014)
• Page Start: 221
• Page End: 222
• Publication Date: 2015-02-09
• Subjects: galaxies: elliptical and lenticular, -- cD - galaxies: kinematics and dynamics - galaxies: halos - galaxies: individual (NGC 3311); Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921314009715
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: We used FORS2 in MXU mode to mimic a coarse 'IFU' in order to measure the 3D large-scale kinematics around the central Hydra I cluster galaxy NGC 3311. Our data show that the velocity dispersion field varies as a function of radius and azimuthal angle and violates point symmetry. Also, the velocity field shows similar dependence, hence the stellar halo of NGC 3311 is a dynamically young structure. The kinematic irregularities coincide in position with a displaced diffuse halo North-East of NGC 3311 and with tidal features of a group of disrupting dwarf galaxies. This suggests that the superposition of different velocity components is responsible for the kinematic substructure in the Hydra I cluster core.