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Dynamical studies of cluster pairs in the magellanic clouds

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Dynamical studies of cluster pairs in the magellanic clouds

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Título Dynamical studies of cluster pairs in the magellanic clouds
Autor Oliveira, Marcio Ramos de
Dottori, Horacio Alberto
Bica, Eduardo Luiz Damiani
Abstract We performed N-body simulations of star cluster encounters with Hernquist’s TREECODE in a CRAY YMP-2E computer under different initial conditions (relative positions and velocities, cluster sizes, masses and concentration degrees). The total number of particles per simulation ranged from 1024 to 20 480. These models are compared with a series of isodensity maps of cluster pairs in the Magellanic Clouds. Evidence is found that during the interactions, transient morphological effects such as an expanded halo, isophotal deformation and isophotal twisting can occur as a result of tidal effects and dynamical friction. The simulations also show that different outcomes are possible depending on the initial parameters: (i) longstanding changes of concentration degree can occur after the collision; (ii) one member can disaggregate; or (iii) the pair can coalesce into a single cluster with a distinct structure compared with the original ones. These simulations can reproduce a wide range of morphological structures in observed cluster pairs.
Contido em Monthly Notices of the Royal Astronomical Society. London. Vol. 295, no. 4 (Apr. 1998), p. 921-932
Assunto Astrofisica extragalatica
Dinamica estelar
Galaxias
Mecanica celeste
Nuvens de magalhaes
[en] Celestial mechanics, stellar dynamics
[en] Galaxies: star clusters
[en] Magellanic Clouds
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/88636
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