Spin Flips: Variation in the Orientation of Dark Matter Halos over their Merger Histories

Details Spin Flips: Variation in the Orientation of Dark Matter Halos over their Merger Histories Spin Flips: Variation in the Orientation of Dark Matter Halos over their Merger Histories

2009-12-23

arxiv.org/abs/0912.4605v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

2 pages, 2 figures, to appear in "Hunting for the Dark: The Hidden Side of Galaxy Formation", Malta, 19-23 Oct. 2009, eds. V.P

Scientific paper

Semi-analytic models of galaxy formation typically form the spheroidal components of galaxies ("bulges"), solely through galactic major mergers. However, it is possible that non-merger events (e.g. a "fly-by" by a smaller halo) can perturb a galaxy--halo system sufficiently to form a bulge. We present a preliminary investigation into the frequency of major changes in halo and galaxy spin direction, which could be signatures of such events.

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