X-ray studies of the central engine in active galactic nuclei with Suzaku

• 作者： Noda, Hirofumi, author.
• 其他作者：
  • SpringerLink (Online service)
• 其他題名：
  • Springer theses.
• 出版： Singapore : Springer Singapore :Imprint: Springer
• 叢書名： Springer theses,
• 主題： Active galactic nuclei. , Active galaxies. , Space astronomy. , Physics. , Astronomy, Observations and Techniques. , Measurement Science and Instrumentation.
• ISBN： 9789812877215 (electronic bk.) 、 9789812877208 (paper)
• FIND@SFXID: CGU
• 資料類型: 電子書
• 內容註: Review -- Instrumentation -- Observation and Data Reduction -- Soft X-ray Analysis -- Hard X-ray Analysis -- Discussion and Conclusion.
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• 摘要註: 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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