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Autore: | Noda Hirofumi |
Titolo: | X-ray Studies of the Central Engine in Active Galactic Nuclei with Suzaku / / by Hirofumi Noda |
Pubblicazione: | Singapore : , : Springer Singapore : , : Imprint : Springer, , 2016 |
Edizione: | 1st ed. 2016. |
Descrizione fisica: | 1 online resource (164 p.) |
Disciplina: | 523.112 |
Soggetto topico: | Observations, Astronomical |
Astronomy - Observations | |
Physical measurements | |
Measurement | |
Astronomy, Observations and Techniques | |
Measurement Science and Instrumentation | |
Note generali: | "Doctoral thesis accepted by the University of Tokyo, Tokyo, Japan." |
Nota di bibliografia: | Includes bibliographical references at the end of each chapters. |
Nota di contenuto: | Review -- Instrumentation -- Observation and Data Reduction -- Soft X-ray Analysis -- Hard X-ray Analysis -- Discussion and Conclusion. |
Sommario/riassunto: | 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. |
Titolo autorizzato: | X-ray Studies of the Central Engine in Active Galactic Nuclei with Suzaku |
ISBN: | 981-287-721-5 |
Formato: | Materiale a stampa |
Livello bibliografico | Monografia |
Lingua di pubblicazione: | Inglese |
Record Nr.: | 9910254609303321 |
Lo trovi qui: | Univ. Federico II |
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