The Origin of the Bifurcation of the Sagittarius Stream or Why the MW Halo is Spherical

Details The Origin of the Bifurcation of the Sagittarius Stream or Why the MW Halo is Spherical The Origin of the Bifurcation of the Sagittarius Stream or Why the MW Halo is Spherical

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confe..58f&link_type=abstract

"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 58-58"

Physics

Scientific paper

The latest Sloan Digital Sky Survey data tracing the tidal stream from the Sagittarius dwarf spheroidal (dSph) reveals a bifurcation in the distribution of debris. The bifurcation is caused by the projection of the old trailing and young leading tidal arms of the Sagittarius dSph. The existence and location of this bifurcation places the strongest constraints to date on the shape of the halo. Using numerical simulations, we find that the halo of our Galaxy has to be close to spherical. This result is not sensitive to variations in the proper motion of Sagittarius (within the observationally permitted range) and is also robust to changes in the details of the Milky Way potential.

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