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Hot Plasma in the Galaxy

Published online by Cambridge University Press:  25 May 2016

S. Yamauchi
S. Yamauchi*
Affiliation:
Faculty of Humanities and Social Sciences, Iwate University, 3-18-34 Ueda, Morioka, Iwate 020, Japan

Extract

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In the X-ray band, we can see weak and extended X-rays along the Galactic plane and near the Galactic Bulge region, although these regions are dominated by many point sources (e.g., Warwick et al. 1985). The Tenma satellite discovered conspicuous emission lines from selected regions near the Galactic plane (Koyama et al. 1986). These lines are identified with K-shell line from He-like Fe, hence the extended emission is attributable to optically thin hot plasmas with temperatures of several keV. The origin of the thin hot plasmas, however, have been debatable, because no class of X-ray objects shows such high temperature plasma emissions. To investigate the origin of the extended X-rays, we are currently observing the Galactic plane regions with the ASCA satellite. In this paper, we report on the ASCA results: the hard X-ray imaging and spectroscopy of the hot plasma in the Galaxy.

Type
Session 1: Plasma and Fresh Nucleosynthesis Phenomena
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 47 - 50
Copyright
Copyright © Kluwer 1998 

References

Kaneda, H. et al. (1997) Complex Spectra of the Galactic Ridge X-rays Observed with ASCA, Astrophys. J. , in press CrossRefGoogle Scholar
Koyama, K. et al. (1986) Thermal X-Ray Emission with Intense 6.7-keV Iron Line from the Galactic Ridge, PASJ , 38, 121 Google Scholar
Koyama, K. et al. (1989) Intense 6.7-keV Iron Line Emission from the Galactic Centre, Nature , 339, 603 Google Scholar
Koyama, K. et al. (1996) ASCA View of Our Galactic Center: Remains of Past Activities in X-rays?, PASJ , 48, 249 Google Scholar
Warwick, R. S. et al. (1985) The Galactic Ridge Observed by Exosat, Nature , 317, 218 CrossRefGoogle Scholar
Yamauchi, S. et al. (1990) Optically Thin Hot Plasma near the Galactic Center: Mapping Observations of the 6.7 keV Iron Line, Astrophys. J. , 365, 532 Google Scholar