Detecting Triaxiality in the Galactic Dark Matter halo through Stellar Kinematics

Details Detecting Triaxiality in the Galactic Dark Matter halo through Stellar Kinematics Detecting Triaxiality in the Galactic Dark Matter halo through Stellar Kinematics

2011-12-19

arxiv.org/abs/1112.4510v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

9 pages, 4 figures, ApJL submitted

Scientific paper

In this work we show how the Milky Way (MW) stellar halo assembling process may have left long lasting fossil, assuming the dark matter halo shape is not spherical (triaxial, prolate, oblate). These features would be caused by the dark matter halo potential orbital structure which is imprinted in the stellar halo kinamatics. In contrast with tidal streams associated with recent satellite acretion events, these features will show inhomogeneous chemical and stellar population properties. If the detection of these peculiar kinematic stellar groups is confirmed, they would be the "smoking gun" for a prediction of cosmological MW formation models, a non-spherical dark matter halo.

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