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PDFOpen Access (License Unspecified), Open Access
Thesis
CARMA modeling of X-ray AGN
Master of Science (M.S.), Drexel University
May 2025
DOI:
https://doi.org/10.17918/00011022
Abstract
The lightcurves of Active Galactic Nuclei often exhibit variation in their lightcurves. We look at using Continuous Autoregressive Moving Average (CARMA) modeling to describe the variability of ~800 X-Ray lightcurves from the SWIFT-BAT 157 Month Hard X-ray Survey. We use the CARMA(2,1) model which corresponds to a damped harmonic oscillator (DHO). CARMA DHOs can be described by four independent parameters: a natural frequency, a damping ratio, a characteristic perturbation timescale, and a perturbation amplitude. We find that while the SWIFT-BAT dataset is too noisy to produce robust CARMA fits it does still prove useful as a showcase for X-ray CARMA analysis, as a comparison to CAMRA work done in the UV/Optical regimes, and as a testbed for EzTao, a python library developed for CARMA analysis.
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Details
- Title
- CARMA modeling of X-ray AGN
- Creators
- Henry E. Adair
- Contributors
- Michael Scott Vogeley (Advisor)Gordon T. Richards (Advisor)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- 18 pages
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- College of Arts and Sciences; Physics; Drexel University
- Other Identifier
- 991022059038104721