Journal
ASTRONOMY & ASTROPHYSICS
Volume 500, Issue 2, Pages 781-784Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200809404
Keywords
gravitation; Galaxy: kinematics and dynamics; Galaxy: structure; stars: kinematics
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We define new potential-density pairs and examine the impact of the potential flattening on the vertical velocity ellipsoid tilt, delta. By means of numerical integrations and analytical calculations, we estimate d in a variety of galactic potentials. We show that at 1 kpc above the Galactic plane at the solar radius, delta can differ by 5 degrees, depending on whether the dark matter halo is flat or spherical. This result excludes the possibility of an extremely flattened Galactic dark halo.
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