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Title: X-ray reverberation in Active Galactic Nuclei
Author: Legg, Eleanor
ISNI:       0000 0004 5920 530X
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2015
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Narrow Line Type-1 Seyfert active galaxies can exhibit a high degree of variability in the X-ray regime. This thesis examines that variability in the context of reverberation models, in which a flare in activity has an extended, energy dependent, response. A novel method is developed for estimating the response function in different energy bands. This method is then applied to three AGN: Ark 564, 1H 0707{495, and NGC 4051. The striking evidence for reverberation revealed in Ark 564 leads to a more thorough examination of that object, combining spectral and temporal approaches to develop a plausible physical model for its behaviour. The preferred model is one in which the reverberation is due to scattering from hot Comptonizing material approximately 1500 light-seconds from the central source. This conclusion is reinforced by a simulation of the angular dependence of reflection by Comptonizing gas.
Supervisor: Miller, Lance Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Astrophysics ; x-rays ; active galaxies ; reverberation