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

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

2007-10-05

arxiv.org/abs/0710.1293v1

Astronomy and Astrophysics

Astrophysics

6 pages, 15 figures. Accepted on Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20078296

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.

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