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Origin of the Galactic Diffuse X-ray Emission: Iron K-Shell Line Diagnostics

Published online by Cambridge University Press:  09 February 2017

Masayoshi Nobukawa ,
Hideki Uchiyama ,
Kumiko K. Nobukawa ,
Shigeo Yamauchi  and
Katsuji Koyama
Masayoshi Nobukawa
Affiliation:
Department of Teacher Training and School Education, Nara University of Education, Takabatake-cho, Nara, Japan630-8528 email: nobukawa@nara-edu.ac.jp
Hideki Uchiyama
Affiliation:
Faculty of Education, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, Japan422-8529
Kumiko K. Nobukawa
Affiliation:
Department of Physics, Nara Women’s University, Kitauoyanishimachi, Nara, Japan630-8506
Shigeo Yamauchi
Affiliation:
Department of Physics, Nara Women’s University, Kitauoyanishimachi, Nara, Japan630-8506
Katsuji Koyama
Affiliation:
Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa-oiwake-cho, Sakyo-ku, Kyoto, Japan606-8502
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Abstract

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An unresolved X-ray emission extends along the Galactic plane, so-called the Galactic diffuse X-ray emission (GDXE). The characteristic feature is three K-shell lines of Fe at 6.4, 6.7, and 6.9 keV. Recently, superposition of faint point sources, such as Cataclysmic variables (CVs) and Active binaries (ABs) is thought to be a major origin, although it is under debate which sub-class mostly contribute. We re-analyzed the Suzaku archive data and constructed spectral models of ABs, magnetic CVs (mCVs), and non-magnetic CVs (non-mCVs). The GBXE is explained by combination of those models; non-mCVs and ABs mainly contribute while mCVs account for ~10% or less of the 5–10 keV flux. On the other hand, the GCXE and GRXE spectra cannot be represented by any combination of the point sources, indicating another origin would be required.

Keywords

Galaxy: centerGalaxy: bulgeGalaxy: diskX-rays: diffuse backgroundX-ray: ISMX-ray: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S322: The Multi-Messenger Astrophysics of the Galactic Centre , July 2016 , pp. 206 - 207
Copyright
Copyright © International Astronomical Union 2017 

References

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