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Probing dark matter haloes of spiral galaxies at poorly explored distances through satellites kinematics

Irina Yegorova (ESO)

In the last decades it has been revealed that dark matter haloes extend
far beyond the optical boundaries of galaxies. However, their actual ?sizes ? and, above all, their density distribution outside
the luminous regions, are still quite unknown. We use satellite galaxies
as dynamical probes to study the distribution of dark matter haloes out to very large radii.
Using VIMOS at the VLT we carried out a spectroscopic survey around seven late-type isolated spiral galaxies. We investigate the kinematics of these spirals, and the radial and angular distribution of the satellites.