No evidence of dark matter in the solar neighborhood

Details No evidence of dark matter in the solar neighborhood No evidence of dark matter in the solar neighborhood

2012-04-17

arxiv.org/abs/1204.3919v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Proceeding of the first binational Sochias-AAA meeting, held in San Juan, Argentina

Scientific paper

We measured the surface mass density of the Galactic disk at the solar position, up to 4 kpc from the plane,by means of the kinematics of ~400 thick disk stars. The results match the expectations for the visible mass only, and no dark matter is detected in the volume under analysis. The current models of dark matter halo are excluded with a significance higher than 5sigma, unless a highly prolate halo is assumed, very atypical in cold dark matter simulations. The resulting lack of dark matter at the solar position challenges the current models.

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