This thesis presents a study of the origin of an apparently extended X-ray emission associated with the Galactic ridge. The study was carried out with broadband spectra obtained from mapping observations in the Galactic bulge region conducted in 2005-2010 by the Suzaku space X-ray observatory. The spectra were analyzed with a newly constructed X-ray spectral model of an accreting white dwarf binary that is one of the proposed candidate stars for the origin of the Galactic ridge emission in the higher energy band. Fitting of the observed Galactic ridge spectra with the model showed that there is another spectral component that fills the gap between the observed X-ray flux and the component expected from the accreting white dwarf spectral model in the lower energy band. This additional soft spectral component was nicely explained by an X-ray spectral model of normal stars. The result, together with previously reported high-resolution imaging results, strongly supports the idea that the Galactic ridge X-ray emission is an assembly of dim, discrete X-ray point sources.
| ISBN: | 9784431547174 |
| Publication date: | 26th June 2015 |
| Author: | Takayuki Yuasa |
| Publisher: | Springer an imprint of Springer Japan |
| Format: | Paperback |
| Pagination: | 154 pages |
| Series: | Springer Theses |
| Genres: |
Astronomical observation: observatories, equipment and methods Scientific standards, measurement etc |
This thesis presents a study of the origin of an apparently extended X-ray emission associated with the Galactic ridge. The study was carried out with broadband spectra obtained from mapping observations in the Galactic bulge region conducted in 2005-2010 by the Suzaku space X-ray observatory. The spectra were analyzed with a newly constructed X-ray spectral model of an accreting white dwarf binary that is one of the proposed candidate stars for the origin of the Galactic ridge emission in the higher energy band. Fitting of the observed Galactic ridge spectra with the model showed that there is another spectral component that fills the gap between the observed X-ray flux and the component expected from the accreting white dwarf spectral model in the lower energy band. This additional soft spectral component was nicely explained by an X-ray spectral model of normal stars. The result, together with previously reported high-resolution imaging results, strongly supports the idea that the Galactic ridge X-ray emission is an assembly of dim, discrete X-ray point sources.
Suzaku Studies of White Dwarf Stars and the Galactic X-Ray Background Emission features in the following genres: Astronomical observation: observatories, equipment and methods, Scientific standards, measurement etc
Suzaku Studies of White Dwarf Stars and the Galactic X-Ray Background Emission is available in Paperback, Hardback
Suzaku Studies of White Dwarf Stars and the Galactic X-Ray Background Emission was written by Takayuki Yuasa and published by Springer an imprint of Springer Japan
Suzaku Studies of White Dwarf Stars and the Galactic X-Ray Background Emission has 154 pages
Yes it is part of Springer Theses series