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Review of the Galactic X-ray Background Emission and White Dwarf Binaries

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Suzaku Studies of White Dwarf Stars and the Galactic X-ray Background Emission

Part of the book series: Springer Theses ((Springer Theses))

Abstract

Detailed reviews on the Galactic X-ray background emission or the Galactic Ridge X-ray emission (GRXE), and white dwarf stars are presented. Two confronting scenarios, the point-source scenario and the truly-diffuse scenario, for the originating source and the emission mechanism of the GRXE are explained. Several recent supports to the point-source origin based on recent X-ray spectroscopic and X-ray high-resolution imaging studies with Chandra are explained. The characteristic performance of our instrument, the Suzaku space X-ray observatory, such as the broad-band spectral capability and the high sensitivity in the hard X-ray wavelength, which are indispensable for the present study to spectroscopically decompose possible contributions from multiple types of X-ray stars to the GRXE, are described.

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Notes

  1. 1.

    A distance of 8 kpc is assumed to calculate intrinsic fluxes. The distance corresponds to that to the Galactic center from the Sun.

  2. 2.

    Note that they did not actually decompose the GRXE spectrum, but just compared a composite spectrum of several types of sources and the GRXE spectrum.

  3. 3.

    Stars with masses below \({\sim }0.5~M_\odot \) have longer life times which are thought to as long as (or longer than) the age of the universe. Therefore, they are probably not the origin of WDs currently existing in the Galaxy.

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  1. Department of Physics, The University of Tokyo, Faculty of Science Bldg.1 #234, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan

    Takayuki Yuasa

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Yuasa, T. (2012). Review of the Galactic X-ray Background Emission and White Dwarf Binaries. In: Suzaku Studies of White Dwarf Stars and the Galactic X-ray Background Emission. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54219-3_2

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