Date of Award
7-17-2008
Degree Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Physics and Astronomy
First Advisor
Dr. H. Richard Miller - Chair
Second Advisor
Dr. William H. Nelson
Third Advisor
Dr. Paul J. Wiita
Fourth Advisor
Dr. D. Michael Crenshaw
Fifth Advisor
Dr. Michael T. Carini
Sixth Advisor
Dr. Douglas R. Gies
Abstract
Active galactic nuclei (AGN) are known to vary in brightness in all regions of the electromagnetic spectrum and over a wide range of timescales. Many methods have been utilized to transform this observed variability into meaningful information about the central engines of AGN. One such technique, adapted from time series analysis of galactic x-ray binary systems, has been used to detect a characteristic break timescale in the power density spectra of x-ray variability in Seyfert galaxies. This timescale, thought to be related to instabilities in the accretion disk, appears to scale with black hole mass over many orders of magnitude. This dissertation performs similar time series analyses with the optical data of eight blazars. The majority of these objects also display a characteristic break timescale. In cases where a black hole estimate is known, the timescales are in good agreement with the relationship observed for galactic x-ray binary systems and Seyfert galaxies. For objects of unknown mass, this relationship can be used to provide a mass estimate of the supermassive black hole. Comparisons are made between the structure function and power density spectrum for each object, and the implications for the connection between the accretion disk and the relativistic jet in AGN are discussed.
DOI
https://doi.org/10.57709/1059827
Recommended Citation
Ryle, Wesley Thomas, "Investigation of Fundamental Black Hole Properties of AGN through Optical Variability." Dissertation, Georgia State University, 2008.
doi: https://doi.org/10.57709/1059827