Evidence for a Triaxial Milky Way Dark Matter Halo from the Sagittarius Stellar Tidal Stream

Details Evidence for a Triaxial Milky Way Dark Matter Halo from the Sagittarius Stellar Tidal Stream Evidence for a Triaxial Milky Way Dark Matter Halo from the Sagittarius Stellar Tidal Stream

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532103l&link_type=abstract

American Astronomical Society, AAS Meeting #215, #321.03; Bulletin of the American Astronomical Society, Vol. 42, p.322

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Observations of the lengthy tidal streams produced by the destruction of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) are capable of providing strong constraints on the shape of the Galactic gravitational potential. However, previous work, based on modeling different stream properties in axisymmetric Galactic models has yielded conflicting results: while the angular precession of the Sgr leading arm is most consistent with a spherical or slightly oblate halo, the radial velocities of stars in this arm are only reproduced by prolate halo models. We demonstrate that this apparent paradox can be resolved by instead adopting a triaxial potential. Our new Galactic halo model, which simultaneously fits all well-established phase space constraints from the Sgr stream, provides the first conclusive evidence for, and tentative measurement of, triaxiality in an individual dark matter halo. In this model, the minor axis of the dark halo is approximately coincident with the Galactic X axis connecting the Sun and the Galactic Center.

Affiliated with

Also associated with

No associations

Rating

Evidence for a Triaxial Milky Way Dark Matter Halo from the Sagittarius Stellar Tidal Stream does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Evidence for a Triaxial Milky Way Dark Matter Halo from the Sagittarius Stellar Tidal Stream, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence for a Triaxial Milky Way Dark Matter Halo from the Sagittarius Stellar Tidal Stream will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-961853