Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 68(12): 865-875 (2019)

特集Special Issues

SMILEによるMeVガンマ線天体探査MeVガンマ線天文学の夜明けSMILE: Sky Survey Project in MeV Gamma RayDawn of MeV Gamma-ray Astronomy

京都大学大学院理学研究科Division of Physics and Astronomy, Graduate School of Science, Kyoto university ◇ 606–8502 京都府京都市左京区北白川追分町 ◇ Kitashirakawa Oiwakecho, Sakyo, Kyoto, Kyoto 606–8502, Japan

発行日:2019年12月15日Published: December 15, 2019

数百keVから数十MeVに渡るMeVγ線での宇宙観測は,元素合成や粒子加速に関して決定的な情報が得られると古くから期待されている一方で,その観測は進んでいない。我々は光学原理に基づくイメージング分光が可能な電子飛跡検出型コンプトン望遠鏡ETCCを開発しており,2度の気球実験からETCCによる高感度天体観測が実現可能であることを示した(SMILE: Sub-MeV/MeV gamma-ray Imaging Loaded-onballoon Experiments)。今後数年の内に科学観測を開始し,MeVγ線天文学を開拓していく。

The observations in MeV gamma-ray region from hundreds keV to tens MeV provide the important information about nucleosynthesis or particle acceleration, but it is not advanced comparing with those of the other bands. For opening the window of MeV gamma rays, we are developing an electron-tracking Compton camera which realizes the imaging spectroscopy based on a sharp point spread function. Our balloon experiments (SMILE: Sub-MeV/MeV gamma-ray Imaging Loaded-onballoon Experiments) verified that our ETCC can realize a high-sensitive observation. We then will start the scientific observations in a few years, and will open up the MeV gamma-ray astronomy.

Key words: MeV gamma-ray astronomy; line gamma-ray; scientific balloon; Compton camera

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