On the Origin of Dynamically Cold Rings Around the Milky Way

Details On the Origin of Dynamically Cold Rings Around the Milky Way On the Origin of Dynamically Cold Rings Around the Milky Way

2008-02-07

arxiv.org/abs/0802.0872v1

Astronomy and Astrophysics

Astrophysics

accepted to ApJL; 4 Figures

Scientific paper

10.1086/587099

We present a scenario for the production of dynamically cold rings around the Milky Way via a high-eccentricity, flyby encounter. These initial conditions are more cosmologically motivated than those considered in previous works. We find that the encounters we examine generically produce a series of nearly dynamically cold ring-like features on low-eccentricity orbits that persist over timescales of ~2-4 Gyr via the tidal response of the primary galaxy to the close passage of the satellite. Moreover, they are both qualitatively and quantitatively similar to the distribution, kinematics, and stellar population of the Monoceros ring. Therefore, we find that a high eccentricity flyby by a satellite galaxy represents a cosmologically appealing scenario for forming kinematically distinct ring-like features around the Milky Way.

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