Publication Date

1990

Document Type

Dissertation/Thesis

First Advisor

Hasan, Mazhar

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Physics

LCSH

Perturbation (Astronomy); Galaxies--Clusters

Abstract

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.

Comments

Includes bibliographical references (leaf 37)

Extent

v, 52 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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