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A 3D view of the Hydra I galaxy cluster core - I. Kinematic substructures

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.

preprint2014arXivOpen access
Michael HilkerCarlos Eduardo BarbosaTom RichtlerLodovico CoccatoMagda ArnaboldiClaudia Mendes de Oliveira
astro-ph.GA
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Michael HilkerCarlos Eduardo BarbosaTom RichtlerLodovico CoccatoMagda ArnaboldiClaudia Mendes de Oliveira

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