Structure in the Velocity Space of Globular Clusters

Details Structure in the Velocity Space of Globular Clusters Structure in the Velocity Space of Globular Clusters

2001-03-14

arxiv.org/abs/astro-ph/0103217v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 Poscript figures, uses new aa.cls. Astronomy and Astrophysics (Letters) accepted

Scientific paper

10.1051/0004-6361:20010374

We present an analysis of the velocity space of a sample of globular clusters (GC) with absolute proper motions. The vertical component of the velocity is found to be correlated with luminosity and galactocentric radius. We divided the sample into two luminosity groups above and below the peak of the luminosity function (LF), MV=-7.5, for Galactic GCs. The two groups display different kinematic behaviour according to the first and second statitical moments of the velocity distribution as well as distinct velocity ellipsoids. The velocity ellipsoid of the high luminosity clusters is aligned with the symmetry axes of the Galaxy, whereas the minor axis of the Low Luminosity group is strongly inclined relative to the Galactic rotation axis.

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