Volume 500, Number 2, June III 2009
|Page(s)||781 - 784|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||01 April 2009|
Potential-density pairs and vertical tilt of the stellar velocity ellipsoid
Université de Strasbourg, CNRS, Observatoire Astronomique, France e-mail: firstname.lastname@example.org
Accepted: 9 March 2009
We define new potential-density pairs and examine the impact of the potential flattening on the vertical velocity ellipsoid tilt, δ. By means of numerical integrations and analytical calculations, we estimate δ in a variety of galactic potentials. We show that at 1 kpc above the Galactic plane at the solar radius, δ 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.
Key words: gravitation / Galaxy: kinematics and dynamics / Galaxy: structure / stars: kinematics
© ESO, 2009
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