• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >ON THE POSSIBLE REASON FOR NONDETECTION OF TeV PROTONS IN SUPERNOVA REMNANTS
【24h】

ON THE POSSIBLE REASON FOR NONDETECTION OF TeV PROTONS IN SUPERNOVA REMNANTS

机译：超新星残骸中TeV质子的可能检出原因

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The theory of shock acceleration predicts the maximum particle energy to be limited only by the acceleration time and the size (geometry) of the shock. This led to optimistic estimates for the galactic cosmic-ray energy achievable in supernova remnant (SNR) shocks. The estimates imply that the accelerated particles, while making no strong impact on the shock structure (test-particle approach), are nevertheless scattered by the strong self-generated Alfven waves (turbulent boost) needed to accelerate them quickly. We demonstrate that these two assumptions are in conflict when applied to SNRs of the age required for cosmic-ray acceleration to the "knee" energy. We study the combined effect of acceleration nonlinearity (shock modification by accelerated particles) and wave generation on the acceleration process. We show that the refraction of self-generated waves resulting from the deceleration of the plasma flow by the pressure of energetic particles causes enhanced losses of these particles. This effect slows down the acceleration and changes the shape of the particle spectrum near the cutoff. The implications for observations of TeV emission from SNRs are also discussed.
机译：冲击加速度理论预测最大粒子能量仅受加速时间和冲击尺寸（几何形状）的限制。这导致对超新星残余（SNR）冲击中可获得的银河系宇宙射线能量的乐观估计。估计表明，加速的粒子虽然不会对冲击结构产生重大影响（测试粒子方法），但是却被快速加速它们所需的强大的自生Alfven波（湍流增强）所散射。我们证明，当将这两种假设应用于宇宙射线加速到“膝盖”能量所需的年龄的SNR时，这两个假设是矛盾的。我们研究了加速非线性（加速粒子对冲击的修正）和波产生对加速过程的综合影响。我们表明，由于高能粒子的压力使等离子体流减速而导致的自生波的折射会导致这些粒子的损失增加。此效果会减慢加速度，并更改截止附近的粒子光谱形状。还讨论了从SNR观察TeV发射的含义。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号