Measurement of high energy cosmic rays originated from Vela SNR

初级宇宙线起源的确定是宇宙线物理研究的重要课题。为了得到最终的答案，最重要的是测量初级宇宙线的各向异性。然而，各向异性的量级预计为0.1%。因此，观察必须具有足够的准确性。这是实现，使周围的大气深度的空气淋浴最大的发展，即，与高空空气淋浴阵列的观测。Chacaltaya（5,200m a. S.（l.）介绍了VelaSNR（VelaSNR）在X射线和γ射线区最活跃的天体之一，从2001年开始的观测情况。在2001年德国汉堡国际宇宙线会议和美国物理学会会议上， 关于我们 观测结果概括如下：（1）观测到银盘初级宇宙线的增强。（2）银经220 °~260 °附近的增强程度约为0.3%。（3）我们对宇宙线在星系中传播的蒙特-卡罗模拟表明，如果船帆座SNR是在10万年前制作的，如果SNR距太阳系的距离约为250 pc，那么由于SNR发射的宇宙线，观测结果很好地解释了。由于目前接受的数值分别是10，000年和500秒差距，最近的ROSAT结果表明，距离约为250秒差距，在100，000年前有另一次爆炸。（3）我们对宇宙线在星系中传播的蒙特-卡罗模拟表明，如果船帆座SNR是在10万年前制作的，如果SNR距太阳系的距离约为250 pc，那么由于SNR发射的宇宙线，观测结果很好地解释了。由于目前接受的数值分别是10，000年和500秒差距，最近的ROSAT结果表明，距离约为250秒差距，在100，000年前有另一次爆炸。少

The establishment of the origin of primary cosmic rays is most important theme in cosmic ray physics. To get the final answer it is most important to measure the anisotropy of primary cosmic rays. However, the order of the magnitude of the anisotropy is expected to be 0.1%. Then the observation must be done with sufficient accuracy. This is achieved so to make an observation around the atmospheric depths of air shower maximum developments, that is, with a high altitude air shower array.In this research, we observed air showers at Mt. Chacaltaya (5,200m a. s. l.) to measure the anisotropy due to the cosmic rays emitted from Vela SNR, which is one of the most active astronomical objects in X-and gamma-ray regions.We stated the observation from 2001 after the installment of the equipments. The observation and analyzes were made continuously and preliminary results were presented in the international conference of cosmic rays in Hamburg, Germany 2001 and the meetings of the Physical Societ … More y of Japan.The observed result is summarized as the follows :(1)The enhancement of primary cosmic rays from the galactic disk is observed.(2)The degree of the enhancement around the galactic longitudinal region from 220 to 260 degree is about 0.3%.(3)Our Monte-Carlo simulation on the cosmic rays propagation in the galaxy shows that if Vela SNR is made at 100,000 years ago if the distance of the SNR from the solar system is about 250 pc, the observed result is well explained due to the cosmic rays emitted from the SNR. Since the present accepted values are 10,000 years and 500 pc, respectively, the resent ROSAT results show that the distance is about 250pc and there is another explosion at 100,000 years ago.(3)Our Monte-Carlo simulation on the cosmic rays propagation in the galaxy shows that if Vela SNR is made at 100,000 years ago if the distance of the SNR from the solar system is about 250 pc, the observed result is well explained due to the cosmic rays emitted from the SNR. Since the present accepted values are 10,000 years and 500 pc, respectively, the resent ROSAT results show that the distance is about 250pc and there is another explosion at 100,000 years ago. Less