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Discovery of a recombination dominant plasma: a relic of a giant flare of Sgr A*?

Published online by Cambridge University Press:  22 May 2014

S. Nakashima ,
M. Nobukawa ,
H. Uchida ,
T. Tanaka ,
T. G. Tsuru ,
K. Koyama ,
H. Uchiyama  and
H. Murakami
S. Nakashima
Affiliation:
Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan email: shinya@cr.scphys.kyoto-u.ac.jp
M. Nobukawa
Affiliation:
Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan email: shinya@cr.scphys.kyoto-u.ac.jp
H. Uchida
Affiliation:
Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan email: shinya@cr.scphys.kyoto-u.ac.jp
T. Tanaka
Affiliation:
Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan email: shinya@cr.scphys.kyoto-u.ac.jp
T. G. Tsuru
Affiliation:
Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan email: shinya@cr.scphys.kyoto-u.ac.jp
K. Koyama
Affiliation:
Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan email: shinya@cr.scphys.kyoto-u.ac.jp Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043
H. Uchiyama
Affiliation:
Science Education, Faculty of Education, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
H. Murakami
Affiliation:
Department of Information Science, Faculty of Liberal Arts, Tohoku Gakuin University 2-1-1 Tenjinzawa, Izumi-ku, Sendai, Miyagi 981-3193, Japan
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Abstract

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We present the discovery of out-flow like plasma emissions with the Suzaku and ASCA data. Those plasmas have a size of ∼150 pc. Remarkably, the southern plasma is in a recombination dominant phase, which is not predicted by standard shock heating. A plausible scenario is either photoionization due to strong jet-like X-rays from Sgr A* or rapid cooling due to adiabatic expansion of a blowout plasma from the Galactic center about 105 years ago.

Keywords

Galaxy: center — X-rays: ISM — ISM: jets and outflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S303: The Galactic Center: Feeding and Feedback in a Normal Galactic Nucleus , October 2013 , pp. 349 - 353
Copyright
Copyright © International Astronomical Union 2014 

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