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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.

Astronomy -- Congresses. --- Pulsars. --- X-ray astronomy --- White dwarf stars --- X-ray sources, Galactic --- Astronomy & Astrophysics --- Physical Sciences & Mathematics --- Astronomy - General --- Astrophysics --- White dwarf stars. --- X-ray astronomy. --- White dwarfs --- Physics. --- Observations, Astronomical. --- Astronomy --- Physical measurements. --- Measurement. --- Astronomy, Observations and Techniques. --- Measurement Science and Instrumentation. --- Observations. --- Space astronomy --- X-rays --- Compact objects (Astronomy) --- Dwarf stars --- Astronomy—Observations. --- Measurement   . --- Measuring --- Mensuration --- Mathematics --- Technology --- Metrology --- Physical measurements --- Measurements, Physical --- Mathematical physics --- Measurement --- Astronomical observations --- Observations, Astronomical --- Suzaku Mission (Japan)

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Special and General Relativity are concisely developed together with essential aspects of nuclear and particle physics. Problem sets are provided for many chapters, making the book ideal for a course on the physics of white dwarf and neutron star interiors.

General relativity (Physics) --- Special relativity (Physics) --- White dwarf stars. --- Neutron stars. --- Black holes (Astronomy) --- Relativité générale (Physique) --- Relativité restreinte (Physique) --- Naines blanches --- Etoiles à neutrons --- Trous noirs (Astronomie) --- White dwarf stars --- Neutron stars --- Atomic Physics --- Astrophysics --- Physics --- Astronomy & Astrophysics --- Physical Sciences & Mathematics --- Relativité générale (Physique) --- Relativité restreinte (Physique) --- Etoiles à neutrons --- EPUB-LIV-FT LIVPHYSI SPRINGER-B --- White dwarfs --- Ether drift --- Mass energy relations --- Relativity theory, Special --- Restricted theory of relativity --- Special theory of relativity --- Relativistic theory of gravitation --- Relativity theory, General --- Frozen stars --- Physics. --- Gravitation. --- Astronomy. --- Astrophysics. --- Cosmology. --- Classical and Quantum Gravitation, Relativity Theory. --- Astrophysics and Astroparticles. --- Astronomy, Astrophysics and Cosmology. --- Compact objects (Astronomy) --- Gravitational collapse --- Stars --- Pulsars --- Dwarf stars --- Relativity (Physics) --- Gravitation --- Astronomical physics --- Astronomy --- Cosmic physics --- Field theory (Physics) --- Matter --- Antigravity --- Centrifugal force --- Properties