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Encounters between spherical galaxies – II. Systems without a dark halo

AuthorsGonzález-García, A. César ; van Albada, T. S.
Keywordsmethods: N-body simulations
galaxies: interactions
galaxies: kinematics and dynamics
galaxies: structure-elliptical
Instituto de Ciencias del Patrimonio
Institute of Heritage Sciences
Issue DateAug-2005
PublisherRoyal Astronomical Society
CitationMonthly Notices of the Royal Astronomical Society, 361 (3): 1043-1054. Oxford.
Abstract[EN]We perform 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.
Publisher version (URL)http://mnras.oxfordjournals.org/content/361/3/1043.full.pdf
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