Encounters between spherical galaxies – II. Systems with a dark halo |
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Authors: | A C González-García T S van Albada |
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Institution: | Physics Department, Technion, Haifa 32000, Israel |
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Abstract: | 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. |
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Keywords: | galaxies: active quasars: emission lines quasars: general |
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