A Numerical Experiment of a Triple Merger of Spirals
Aceves, Hector
Original · EN
We present a preliminary report on the dynamical evolution of triplets of spiral galaxies that lead to merger remnants that resemble an elliptical. We find that large projected stellar tidal tails 200 Kpc can develop during the binary formation, and up to 350 Kpc in the third galaxy when this merges with the binary. When gas is treated as test-particles, gaseous tidal tails may reach up to 1 Mpc in radius in a Hubble time; this radius is similar to the size of the common dark halo formed during the interaction. It is suggested that gaseous tails may provide a mean to determine to some extent the size of the common dark halo formed during the merging of spirals. The stellar remnant shows an elliptical-like surface density profile, but its phase-space retains more information that can be used to determine whether it was assembled from spirals or not.
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