- [*] Flattening and kinematics of the galactic halo
- van der Marel R.P.
- MNRAS, 248, 515-522, 1991
- © 1991. The Royal Astronomical Society.
All Rights Reserved.
this paper in the ADS
The Jeans equations are used to study the Galactic halo. Relations
are derived between the axis ratio q of the metal-poor halo, the axis
ratio q_d of the dark halo and the local velocity ellipsoid of
metal-poor halo stars. Comparison with observational data implies
that: (i) neither models in which the principal axes of the velocity
ellipsoid align with cylindrical coordinate axes, nor models in which
they align with spherical coordinate axes can be ruled out by the
presently available observational data; (ii) if the principal axes of
the velocity ellipsoid align with cylindrical coordinate axes, then q
< 0.67; (iii) if the metal-poor halo and the dark halo have the same
axis ratio, then q = q_d > 0.53; (iv) the axis ratio of the dark halo
must satisfy q_d > 0.34.
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