M.S. (Master of Science)
Department of Physics
Perturbation (Astronomy); Galaxies--Clusters
When a cluster or galaxy interacts with some massive perturber, tidal effects cause a change of the energy, <ΔE>[sub c] of the cluster. Previous calculations of this change of energy for high velocity, nonpenetrating interactions yielded positive definite values for single perturbers. This conclusion has been extrapolated to multiple perturbers by simply assuming each perturber acted independently and therefore the net change of energy of the cluster was simply the sum of the changes due to each perturber. It is shown that under certain conditions multiple perturbers interact with a cluster in such a way as to produce cross terms in the calculation of <ΔE>[sub c]. Further, these cross terms may be negative and may dominate the calculation of <ΔE>[sub c,] giving a negative change of cluster energy.
Moriarty, Thomas E., "Change of energy of a cluster due to tidal interaction with multiple perturbers" (1990). Graduate Research Theses & Dissertations. 1715.
v, 52 pages
Northern Illinois University
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