Old stellar counter-rotating components in early-type galaxies from elliptical-spiral mergers

Abstract

We investigate, by means of numerical simulations, the possibility of forming counter-rotating old stellar components by major mergers between an elliptical and a spiral galaxy. We show that counter-rotation can appear both in dissipative and dissipationless retrograde mergers, and it is mostly associated to the presence of a disk component, which preserves part of its initial spin. In turn, the external regions of the two interacting galaxies acquire part of the orbital angular momentum, due to the action of tidal forces exerted on each galaxy by the companion.

6 pages, 15 figures. Accepted on Astronomy & Astrophysics

References in corpus (4)

• Star formation efficiency in galaxy interactions and mergers: a statistical study
• The SAURON project - VIII. OASIS/CFHT integral-field spectroscopy of elliptical and lenticular galaxy centres
• The line of sight velocity distributions of simulated merger remnants
• 2-Dimensional Kinematics of Simulated Disc Merger Remnants

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