2011

More on the structure of tidal tails

Kuepper, Andreas H. W., Lane, Richard R., Heggie, Douglas C.

Understand

We investigate the epicyclic motion of stars escaping from star clusters.

Using streaklines, we visualise the path of escaping stars and show how epicyclic motion leads to over- and underdensities in tidal tails of star clusters moving on circular and eccentric orbits about a galaxy.
Additionally, we investigate the effect of the cluster mass on the tidal tails, by showing that their structure is better matched when the perturbing effect of the cluster mass is included.
By adjusting streaklines to results of N-body computations we can accurately and quickly reproduce all observed substructure, especially the streaky features often found in simulations which may be interpreted in observations as multiple tidal tails.

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