Study of the Origin of Galactic Cosmic Ray using TeV gamma-ray imaging and spectra observed by CANGAROO-III

在此期间，我们在南澳的Wommera建造了三台10米成像空气切伦科夫望远镜（IACT），用于观测TeV γ射线，并从2004年4月开始利用这三台望远镜进行了立体观测。本课题组致力于望远镜电子学系统和在线系统的研制。特别是在2004年12月，我们实现了立体观测的专用触发系统，其中至少有两台望远镜在约1微秒内检测到簇射。该系统使我们能够拒绝由偶然撞击和宇宙μ子产生的背景触发，并获得稳定的操作。此外，我们还研究了夜空背景对使用闪光模拟数字化仪（FADC）成像分析的影响，该数字化仪以500 MHz的采样率记录光电倍增管的脉冲形状。通过本研究，脉冲形状的精确测量有望提高角分辨率和强子簇射的排斥能力。我们还在CANGAROO（京都大学，东海大学和甲南大学）进行独立分析。自主开发了立体观测分析程序工具。使用这个程序，我们分析了几个SNR，SNR RXJ0852，1713和开普勒，以及两个脉冲星星云：蟹状星云和PSR 1509。特别是我们已经获得了整个TeV的γ射线图像从RXJ0852。我们还得到了开普勒γ射线辐射的TeV上限。

In this period, we have constructed three 10m Imaging Air Cherenkov Telescopes (IACT) for the observation of celestial TeV gamma rays at Wommera in South Australia, and hegun the stereo observation using those three telescope since 2004 April. Our group made efforts to develop the electronics system and online system of these telescope. In particular, in 2004 December, we realized the specialized trigger system for the stereo observation in which at least two telescopes detects the shower within about 1 μsec. This system enables us to reject the background trigger generated by the accidental hits and cosmic muons, and to obtain the stable operation. In addition we have studied the effect of the night sky background to the imaging analysis using Flash Analog Digitizer (FADC), which records the pulse shapes of the photo-multiplier with the 500 MHz sampling rate. By this study, the precise measurement of the pulse shape is expected to improve the angular resolution and the rejection power of the hadron shower. Also we organized the sub-analysis team in the CANGAROO (Kyoto Univ., Tokai Univ., and Konan Univ.) for the independent analysis. We independently developed the analysis program tools for the stereo observation. Using this program we are analyzing the several SNRs, SNR RXJ0852, 1713, and Kepler, and two pulsar nebulae : Crab and PSR1509. In particular we have obtained the whole TeV gamma-ray image from RXJ0852. Also we have get the upper limit for the TeV gamma-ray emission from the Kepler.