| Issue |
A&A
Volume 500, Number 2, June III 2009
|
|
|---|---|---|
| Page(s) | 781 - 784 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361/200809404 | |
| 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: bienayme@astro.u-strasbg.fr
Received:
16
January
2008
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.