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Apparent Rotation of the Galactic Globular Cluster System

Published online by Cambridge University Press:  19 July 2016

J. Colin
J. Colin*
Affiliation:
Besançon Observatory, France

Abstract

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We use the radial velocities of galactic globular clusters, corrected for solar motion to calculate their apparent angular momentum. Comparing the apparent angular momentum with a numerical simulation we show, with 90% confidence, that the globular cluster system is in prograde rotation. The distribution of angular momentum with Fe/H reveals three distinct groups of clusters with different kind of rotation:

1) 19 clusters with Fe/H > −0.8 have a solid-body rotation in the direct sense.

2) 33 clusters with −1.75 < Fe/H < −0.8 do not exhibit any rotation (80%. confidence).

3) 27 clusters with Fe/H < −1.75 have a uniform rotational velocity in the direct sense (90% confidence).

Type
Chapter VII. Poster Papers on Harlow Shapley and Globular Clusters in the Milky Way
Information
Symposium - International Astronomical Union , Volume 126: The Harlow-Shapley Symposium on Globular Cluster Systems in Galaxies , 1988 , pp. 521 - 522
Copyright
Copyright © Kluwer 1988 

References

REFERENCE

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