Award Date

1-1-1998

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics

First Committee Member

George Rhee

Number of Pages

185

Abstract

A comparison of three tests to determine substructure in rich Abell clusters of galaxies was preformed and the results are presented in this paper. The data used are ROSAT PSPC X-ray images of a sample of 21 clusters drawn from the ACO catalog, and a subset of the ESO Nearby Abell Cluster Survey done by Katgert et, al. The three methods used are: the 'center shift' method developed by Mohr et al., the 'moment' method developed by Buote & Tsai and a wavelet analysis developed by Starck et al. Models were then created to check the significance of our findings. The conclusions reached were that substructure and cooling flows are present in at least 50% of our sample. In addition, although it is possible to get a generally accurate result using only one of the above methods, the use of a multi-pronged analysis approach to achieve maximum accuracy is desirable.

Keywords

Clusters; Galaxies; Ray; Rich; Study; Substructure

Controlled Subject

Astronomy

File Format

pdf

File Size

2406.4 KB

Degree Grantor

University of Nevada, Las Vegas

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