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

AuthorsGonzález-García, A. César ; van Albada, T. S.
Keywordsmethods: N-body simulations
galaxies: elliptical and lenticular, cD
galaxies: interactions
galaxies: kinematics and dynamics
galaxies: structure
Institute of Heritage Sciences
Instituto de Ciencias del Patrimonio
Issue DateAug-2005
PublisherRoyal Astronomical Society
CitationMonthly Notices of the Royal Astronomical Society, 361 (3): 1030-1042. Oxford.
Abstract[EN]We report here on a survey of N-body simulations of encounters between spherical galaxies. Initial systems are isotropic Jaffe models. Different sets of mass ratios, impact parameters and orbital energies are studied. Both merger remnants and systems perturbed after a non-merging encounter are analysed and compared to real-life elliptical galaxies. The properties of merger remnants show a large variety. Merger remnants resulting from head-on encounters are mainly non-rotating prolate spheroids. Merger remnants from models with Jorb≠ 0 are tri-axial or mildly oblate spheroids, supported in part by rotation. The velocity distributions are biased towards the radial direction in the prolate case and the tangential direction in the oblate case. Non-mergers are affected in various ways, depending on the orbital characteristics. We conclude that many of the global properties of real-life ellipticals can, in principle, be attributed to a merger of spherical progenitors.
Publisher version (URL)http://mnras.oxfordjournals.org/content/361/3/1030.full
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