Abstract
We compare the formation of counterrotating elliptical galaxies in two alternative scenarios: a) The scenario of merging of a primary and a satellite galaxy, and b) the direct scenario, in which counterrotating galaxies are formed directly from cosmological initial conditions.
In both scenarios a proper tuning of initial parameters is required for counterrotation to appear. However, the scenario of merger events is much more demanding as regards the number and the values of initial parameters that need to be properly arranged for the remnant of merging to counterrotate.
In the direct scenario counterrotation appears as a spontaneous result of the cosmological tidal interaction between a bound system, formed by a bar-like density excess in the early post-decoupling Universe, and the density perturbations of the environment. The parameter space is much more simple. Only a few initial parameters need to be properly arranged.
Although the two scenarios are independent and might have worked in parallel, the large number of the observed counterrotating elliptical galaxies is in favour of the direct scenario.
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Voglis, N., Harsoula, M. (2002). Forming Counterrotating Galaxies. In: Plionis, M., Cotsakis, S. (eds) Modern Theoretical and Observational Cosmology. Astrophysics and Space Science Library, vol 276. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0622-4_13
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DOI: https://doi.org/10.1007/978-94-010-0622-4_13
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