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

Published online by Cambridge University Press:  09 February 2015

Michael Hilker ,
Carlos Eduardo Barbosa ,
Tom Richtler ,
Lodovico Coccato ,
Magda Arnaboldi  and
Claudia Mendes de Oliveira
Michael Hilker
Affiliation:
European Southern Observatory, Garching, Germany, email: mhilker@eso.org
Carlos Eduardo Barbosa
Affiliation:
European Southern Observatory, Garching, Germany, email: mhilker@eso.org Universidade de Sao Paulo, Sao Paulo, Brazil
Tom Richtler
Affiliation:
Universidad de Concepción, Concepción, Chile
Lodovico Coccato
Affiliation:
European Southern Observatory, Garching, Germany, email: mhilker@eso.org
Magda Arnaboldi
Affiliation:
European Southern Observatory, Garching, Germany, email: mhilker@eso.org
Claudia Mendes de Oliveira
Affiliation:
Universidade de Sao Paulo, Sao Paulo, Brazil
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Abstract

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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.

Keywords

galaxies: elliptical and lenticularcD - galaxies: kinematics and dynamics - galaxies: halos - galaxies: individual (NGC 3311)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 221 - 222
Copyright
Copyright © International Astronomical Union 2015 

References

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