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Magnetic Reconnection as the Origin of Galactic Ridge X-Ray Emission

Published online by Cambridge University Press:  25 May 2016

S. Tanuma ,
T. Yokoyama ,
T. Kudoh ,
K. Shibata ,
R. Matsumoto  and
K. Makishima
S. Tanuma
Affiliation:
Department of Astronomy, School of Science, University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
T. Yokoyama
Affiliation:
National Astronomical Observatory of Japan 2-21-1 Osawa, Mitaka-shi, Tokyo 181, Japan
T. Kudoh
Affiliation:
National Astronomical Observatory of Japan 2-21-1 Osawa, Mitaka-shi, Tokyo 181, Japan
K. Shibata
Affiliation:
National Astronomical Observatory of Japan 2-21-1 Osawa, Mitaka-shi, Tokyo 181, Japan
R. Matsumoto
Affiliation:
Department of Physics, Faculty of Science, Chiba University
K. Makishima
Affiliation:
Department of Physics, School of Science, University of Tokyo 133 Yayoi-cho, Inage-ku, Chiba 263, Japan 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan

Extract

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We present a scenario for the origin of the hot plasma in our Galaxy, as a model of a strong X-ray emission (LX(2 – 10keV) ~ 1038 erg s−1), called Galactic Ridge X-ray Emission (GRXE), which has been observed near the Galactic plane. GRXE is thermal emission from hot component (~ 7 keV) and cool component (~ 0.8 keV). Observations suggest that the hot component is diffuse, and is not escaping away freely. Both what heats the hot component and what confines it in the Galactic ridge are still remained puzzling, while the cool component is believed to be made by supernovae. We propose a new scenario: the hot component of GRXE plasma is heated by magnetic reconnection, and confined in the helical magnetic field produced by magnetic reconnection or in the current sheet and magnetic field. We solved also the 2-dimensional magnetohydrodynamic (MHD) equations numerically to study how the magnetic reconnection creates hot plasmas and magnetic islands (helical tubes), and how the magnetic islands confine the hot plasmas in Galaxy. We conclude that the magnetic reconnection is able to heat up the cool component to hot component of GRXE plasma if the magnetic field is localized into intense flux tube with Blocal ~ 30 μG (the volume filling factor of f ~ 0.1).

Type
Session 1: Plasma and Fresh Nucleosynthesis Phenomena
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 269 - 270
Copyright
Copyright © Kluwer 1998 

References

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