Award Date

5-1-2013

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics and Astronomy

First Committee Member

George Rhee

Second Committee Member

Stephen Lepp

Third Committee Member

Kentaro Nagamine

Fourth Committee Member

Rodney Metcalf

Number of Pages

145

Abstract

Rotation curves measured using Hi emission are a powerful tool for probing the mass distribution of galaxies. We investigate the accuracy with which rotation curves can be determined using the tilted-ring model. We have examined the effect of varying the dynamic center on measured rotation velocities within the inner regions of galaxies where the disagreement between theory and observation is the greatest. We examine a sample of dwarf galaxies (and one spiral galaxy) from the THINGS high-resolution survey (Walter et al. 2008). We find that the measured rotation curve is quite sensitive to the location of the dynamic center. This center is difficult to determine for dwarf galaxies. We also find that errors in rotation velocities determined with the tilted-ring method have been underestimated in previous studies.

Keywords

Dark Matter; Galaxies: Fundamental Parameters; Galaxies: Individual: DDO 154; DDO 53; IC 2574; NGC 2366; NGC 3627; Galaxies: ISM; Galaxies: Kinematics & Dynamics

Disciplines

Astrophysics and Astronomy

Language

English


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