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

  • Masayoshi Nobukawa (a1), Hideki Uchiyama (a2), Kumiko K. Nobukawa (a3), Shigeo Yamauchi (a3) and Katsuji Koyama (a4)...

Abstract

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.

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References

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Hong, J. 2012, MNRAS, 427, 1633
Nobukawa, H. Uchiyama, Nobukawa, K. K., Yamauchi, S., & Koyama, K. 2016, ApJ, submitted
Revnivtsev, M., Sazonov, S., Churazov, E., et al. 2009, Nature, 458, 1142
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Yamauchi, S., Nobukawa, K. K., Nobukawa, M., Uchiyama, H., & Koyama, K. 2016, PASJ
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Keywords

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

  • Masayoshi Nobukawa (a1), Hideki Uchiyama (a2), Kumiko K. Nobukawa (a3), Shigeo Yamauchi (a3) and Katsuji Koyama (a4)...

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