Potential-density pairs and vertical tilt of the stellar velocity ellipsoid

Details Potential-density pairs and vertical tilt of the stellar velocity ellipsoid Potential-density pairs and vertical tilt of the stellar velocity ellipsoid

2009-04-07

arxiv.org/abs/0904.1140v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

accepted Astron. Astroph

Scientific paper

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 $\delta$ 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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