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第1352回 天文学教室談話会

日時

2012年12月17日(月) 15:00

場所

大輪講室

講演者

服部 誠 (東北大天文)

題目

On the new aspects found in the Galactic central region: if the wind blows the bucket makers prosper

要旨

The Galactic central region is bubbly now. European CMB satellite PLANCK confirmed the existence of the Microwave Haze emission in the Galactic central region which was first pointed out by the analysis of WMAP data. Latter the existence of the gamma-ray bubble in the Galactic central region was also explored by US gamma-ray satellite Fermi. The similarities in the morphology and the spectral index of the gamma-ray bubble with the Microwave Haze are suggesting that both could be the same origin. Some other new aspect is going to be published soon.
Plenty of interpretations for these phenomena have been proposed. One of the extreme models claims that the Haze emission is coming from the annihilation of the dark matter particles which composes the Galactic dark halo.
In this talk, we will introduce a new model of the Galactic Haze and gamma-ray bubble emissions based on the Jitter radiation from the turbulent magnetic field in the Galactic warm gaseous halo excited by plasma kinetic instability. First, I review the observational evidences of the Haze, Gamma-ray bubble, S-PASS bubble and warm gaseous halo. Next, I introduce the physics of the plasma kinetic instability and the Jitter radiation. Then, I show the results of the comparison of the theoretical expectations and the observational results.

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【The Colloquium Committee in 2012】
Shijun Yoshida (yoshida<at>astr.tohoku.ac.jp)
Masaki Takayama (m.takayama<at>astr.tohoku.ac.jp)
Hidetomo Honma (hide<at>astr.tohoku.ac.jp)
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