Development of high-energy particle astrophysics in Tibet

西藏高能粒子天体物理发展

• 批准号: 17403004
• 负责人: YUDA Toshinori
• 金额: $ 9.54万
• 依托单位: Kanagawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17403004/
• 关键词: Tibet; air-shower array; high energy gamma-ray; high-energy cosmic-ray; knee region; sun shadow; International Collaboration; China; ガンマ線天体; 国際研究者交流; 活動的天体; 宇宙線; 粒子線天体物理; Tibet; air-shower array; high energy gamma-ray; high-energy cosmic-ray; knee region; sun shadow; International Collaboration; China; ガンマ線天体; 国際研究者交流; 活動的天体; 宇宙線; 粒子線天体物理

The present air-shower array at Yangbajing in Tibet was completed in the late fall of 2003 and has then been successively operating to date. The array(Tibet-III) consists of about 800 scintillation counters, which are deployed at a grid of 7.5m spacing covering the area of 37000m^2. The trigger rate of air-shower events is set to about 1.7kHz and the arrival direction of each event can be estimated with an inaccuracy of less than 0.9 degrees in the energy region over 3 TeV. The main objectives are to search for high-energy gamma rays from active celestial objects and to study very high energy Galactic cosmic rays. These observations are very important to clarify the origin of cosmic rays and their acceleration mechanism.The main results obtained until now are as follows.1) The energy spectrum of all-particle cosmic rays has been observed in the wide energy range from 10^<14> to 10^<17> eV with a sharp knee at the energy around 4x1015 eV.2) The energy spectra of primary protons and heli … More ums are for the first time observed in the knee energy region.3) High energy gamma rays above about 3 TeV have been successfully observed from the Crab Nebula and active galactic nuclei such as Mrk421 and Mrk501. A long-term correlation between RV gamma-ray s and X-ray flares from XMM Newton satellite was observed to provide information about electron acceleration at the source.4) An energy dependence of the large-scale anisotropy of the Galactic cosmic rays has been for the first time observed and also significant anisotropy of multi-TeV cosmic rays is observed in the direction of Cygnus region.5) A variation of the sun shadow during the solar activity cycles was successively monitored with the air shower array, and we succeeded to get new information about the solar magnetic field.Last year we constructed a 100m^2 water-Cherenkov-type muon detector in the underground of the Tibet air shower array. The total area of muon detectors will be expanded up to about 10000m^2 in the very near future. This instrument with a wide field of view then becomes the most sensitive? gamma-ray detector at energies above several times 10 TeV in the world. It is expected that this experiment enables us to provide very important results on the acceleration of high energy cosmic rays, which is still unresolved. Less

目前在西藏的扬巴吉（Yangbajing）的空调阵列于2003年秋末完成，随后已经成功运行。阵列（西藏-III）由约800个闪烁计数器组成，它们以750万的网格覆盖37,000m^2的面积部署。空调事件的触发速率设置为约1.7kHz，每个事件的到达方向可以估计在3 TEV以上的能量区域的不准确度小于0.9度。主要目的是搜索来自活跃天体物体的高能量伽玛射线，并研究非常高的银河系宇宙射线。这些观察结果对于阐明宇宙射线的起源及其加速机制非常重要。到目前为止获得的主要结果如下。1）在10^<14>到10^<17> eV的宽敞能量范围内，全颗粒宇宙射线的能量光谱已在较宽的能量范围内观察到，在4x1015 ev.2 ev.2 ev.2 ev。 3）从螃蟹星云和主动银河核（例如MRK421和MRK501）中成功观察到了高于3 TEV的高能量伽马射线。观察到，观察到了XMM牛顿卫星的RV伽马射线和X射线耀斑之间的长期相关性，可以在源头提供有关电子加速度的信息。4）在第一次观察到了银河系宇宙射线的大尺度各向异性的能量依赖性，并且已经观察到了cosmic rays of cosmic osmic of a s cosmic of a s cosmic of a s cosmic of a s an Cosmic of a is cosmic of a is cosmic of a s in Dively o nirection。太阳活动循环期间的太阳阴影通过空气淋浴阵列成功监测，我们成功地获取了有关太阳能磁场的新信息。last年，我们在西藏空气淋浴阵列的基础上构建了100m^2 Water-Cherenkov-type MUON探测器。在不久的将来，MUON探测器的总面积将扩展到约10000m^2。然后，这个具有广泛视野的乐器变得最敏感吗？在世界上有几次TEV以上的伽马射线探测器。可以预期，该实验使我们能够在尚未解决的高能宇宙射线加速上提供非常重要的结果。较少的