An analysis of the peculiar velocity structure in galaxy cluster A154

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dc.contributor.advisor Berrington, Robert C. Tobin, Ryan Welsey 2016-12-19T21:28:56Z 2016-12-19T21:28:56Z 2016-12-17
dc.description en_US
dc.description.abstract Galaxy clusters are the largest, gravitationally bound structures in the universe. Galaxy cluster growth is believed to occur hierarchically through the merging of smaller clusters to form large clusters. Cluster interactions constrain and quantify current knowledge in dark matter and dark energy, which provides a basis for the large-scale structure of the universe. Actively merging clusters appear as multiple relaxed systems superimposed in position and velocity space. An analysis of the structure of Abell 154 is presented, including 176 new radial velocity measurements. The cluster exhibits a clearly defined foreground group in addition to the main group of galaxies, which is confirmed by X-ray data from the literature. The foreground group and the main group differ significantly in radial velocity, suggesting no interaction. The main group (z 0.063) also has a velocity distribution that is not fully consistent with a relaxed state. Statistical tests are used to identify and analyze possible substructure, including mass estimation and gravitational binding tests. en_US
dc.description.sponsorship Department of Physics and Astronomy
dc.subject.lcsh Galaxies -- Clusters.
dc.subject.lcsh Galaxies -- Motion in line of sight.
dc.title An analysis of the peculiar velocity structure in galaxy cluster A154 en_US Thesis (D. Ed.) en_US

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  • Doctoral Dissertations [3134]
    Doctoral dissertations submitted to the Graduate School by Ball State University doctoral candidates in partial fulfillment of degree requirements.

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