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

  • Hirofumi┬áNoda

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xv
  2. Hirofumi Noda
    Pages 1-26
  3. Hirofumi Noda
    Pages 27-34
  4. Hirofumi Noda
    Pages 35-41
  5. Hirofumi Noda
    Pages 43-81
  6. Hirofumi Noda
    Pages 83-128
  7. Hirofumi Noda
    Pages 129-152
  8. Back Matter
    Pages 153-153

About this book


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.


ASTRO-H Active galactic nuclei Decomposition of X-ray spectral components Supermassive black hole Suzaku X-ray astrophysics

Authors and affiliations

  • Hirofumi┬áNoda
    • 1
  1. 1.Department of Astronomy, School of ScienceThe University of TokyoTokyoJapan

Bibliographic information

  • DOI
  • Copyright Information Springer Science+Business Media Singapore 2016
  • Publisher Name Springer, Singapore
  • eBook Packages Physics and Astronomy
  • Print ISBN 978-981-287-720-8
  • Online ISBN 978-981-287-721-5
  • Series Print ISSN 2190-5053
  • Series Online ISSN 2190-5061
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