Encounters between spherical galaxies. 2. Systems with dark halo - INSPIRE

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Encounters between spherical galaxies. 2. Systems with dark halo

Jun, 2005

12 pages

Published in:

Mon.Not.Roy.Astron.Soc. 361 (2005) 1043-1054

e-Print:

astro-ph/0506015 [astro-ph]

DOI:

10.1111/j.1365-2966.2005.09243.x

View in:

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Abstract: (arXiv)

We performe N-body simulations of encounters between spherical systems surrounded by a spherical halo. Following a preceding paper with a similar aim, the initial systems include a spherical Jaffe model for the luminous matter and a Hernquist model for the halo. The merger remnants from this sample are mainly slowly rotating, prolate spheroids with a radially anisotropic velocity distribution. The results are compared with real-life ellipticals and with the models without halo in paper I. We argue that elliptical galaxies with evidence of dark matter could be formed in the field via a merger of spheroids surrounded by a dark matter halo, while ellipticals with no evidence of dark matter might be formed via a merger of two spheroids in a cluster.

GALAXIES INTERACTIONS
GALAXIES KINEMATICS
GALAXIES DYNAMICS
GALAXIES STRUCTURE
ELLIPTICAL GALAXIES
NUMERICAL SIMULATIONS

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