Armando Rojas-Niño, Octavio Valenzuela, Barbara Pichardo, Luis A. Aguilar
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.
View original:
http://arxiv.org/abs/1112.4510
No comments:
Post a Comment