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The Hot Gas in the Galactic Bulge

Published online by Cambridge University Press:  25 May 2016

K. Koyama  and
Y. Maeda
K. Koyama
Affiliation:
Department of Physics, Kyoto University, Sakyo-ku, Kyoto, 606-01 Japan
Y. Maeda
Affiliation:
Department of Physics, Kyoto University, Sakyo-ku, Kyoto, 606-01 Japan

Abstract

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X-ray imaging spectroscopic observations near the Galactic center region were carried out with the ASCA satellite. We found two bright spots very close to the Galactic center (Sgr A∗); one is extended and has a soft spectrum associated with strong emission lines from highly ionized irons, while the other is a point-like object with a harder spectrum and a larger absorption. We also found extended emission with K-shell transition lines from highly ionized Si, S, Ar, Ca and Fe. Remarkable feature found with ASCA is an extended emission of 6.4 keV lines of low ionization irons. The 6.4 keV line fluxes are found to be well correlated to the region of cool clouds. We interpret that the 6.4 keV line is due to florescence from the cool clouds irradiated by strong (and obscured from our line of sight) X-ray beams.

Type
Chapter 4: Is there a Consistent Picture of the Inner kpc of the Milky Way?
Information
Symposium - International Astronomical Union , Volume 169: Unsolved Problems of the Milky Way , 1996 , pp. 287 - 295
Copyright
Copyright © Kluwer 1996 

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