X-ray Studies of the Central Engine in Active Galactic Nuclei with Suzaku

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Springer, Dec 7, 2015 - Science - 153 pages

The aim of this research was to use the X-ray satellite Suzaku to establish a picture of a central engine that effectively converts the gravitational energy of accreting matter onto the supermassive black hole to a huge amount of radiation in an active galactic nucleus. Although the engine is known to consist of a Comptonizing corona and an accretion disk, its image has remained unclear because primary emissions, coming directly from the engine, cannot be identified in X-ray spectra without models. The book describes a technique of time variability assisted spectral decomposition to model-independently examine X-ray signals, and how this was applied to the Suzaku archive data of active galactic nuclei. As a result, at least three distinct primary X-ray components have been discovered in an X-ray from an active galactic nucleus, presumably indicating a novel picture that the engine is composed of multiple coronae with different physical properties in an accretion flow. Furthermore, the determination of the spectral shapes of the primary X-rays has a significant impact on estimations of black hole spins, because it is essential to quantify reprocessed X-ray spectra. The successful model-independent decomposition of X-ray spectral components with flux variations of active galactic nuclei is likely to be effective in future data analyses from the soon-to-be-launched Japanese X-ray satellite ASTRO-H, which is capable of achieving unprecedented fine spectros

copy and broad energy band coverage.

 

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Contents

1 Review
1
2 Instrumentation
27
3 Observation and Data Reduction
35
4 Soft Xray Analysis
43
5 Hard Xray Analysis
82
6 Discussion and Conclusion
129
Curriculum Vitae
153
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About the author (2015)

Dr. Hirofumi Noda

Department of Astronomy, The University of Tokyo


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