X-ray Studies of the Central Engine in Active Galactic Nuclei with Suzaku [[electronic resource] /] / by Hirofumi Noda

• Autore: Noda Hirofumi
• 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
• Serie: Springer Theses, Recognizing Outstanding Ph.D. Research, . 2190-5053