米拉格罗反中心热点：来自Geminga超新星的宇宙射线？
The Milagro anticenter hot spots: cosmic rays from the Geminga supernova ?
摘要：
米拉格罗实验宣布，从日尾的大致方向发现了TeV的过量宇宙射线，也接近银河系的反中心。我们研究了一个假设，即多余的宇宙射线产生于超新星爆炸，诞生了Geminga脉冲星。我们提出的假设是，Geminga超新星发生在大约3.4 × 10^5年前（如自旋下降时标所示），一股宇宙射线的爆发注入了总能量10^49 erg（即，约为典型SN输出的1%），并且Geminga脉冲星诞生时的正径向速度为100 - 200 km s ^-1。我们发现我们的假设与现有的信息是一致的。在第一变体（可能过于简化）中，宇宙射线根据玻姆公式（即，扩散系数大约为c乘以r_L，c为光速，r_L为拉莫尔半径）。另一种方案假设扩散只在最初发生，最终传播到太阳是在发散的磁场中的自由流。如果观测到的宇宙射线过剩确实是由盖明加SN爆炸引起的，那么长期以来一直在寻找的将宇宙射线与超新星联系起来的"吸烟枪"将终于到手。可以说，在寻找"冒烟的枪"时，我们被子弹击中了。
英文摘要：
The Milagro experiment has announced the discovery of an excess flux of TeV cosmic rays from the general direction of the heliotail, also close to the Galactic anticenter. We investigate the hypothesis that the excess cosmic rays were produced in the SN explosion that gave birth to the Geminga pulsar. The assumptions underlying our proposed scenario are that the Geminga supernova occurred about 3.4 10^5 years ago (as indicated by the spin down timescale), that a burst of cosmic rays was injected with total energy 10^49 erg (i.e., about 1% of a typical SN output), and that the Geminga pulsar was born with a positive radial velocity of 100--200 km s^-1. We find that our hypothesis is consistent with the available information. In a first variant (likely oversimplified), the cosmic rays have diffused according to the Bohm prescription (i.e., with a diffusion coefficient on the order of c times r_L, with c the speed of light and r_L the Larmor radius). An alternative scheme assumes that diffusion only occurred initially, and the final propagation to the Sun was a free streaming in a diverging magnetic field. If the observed cosmic ray excess does indeed arise from the Geminga SN explosion, the long--sought "smoking gun" connecting cosmic rays with supernovae would finally be at hand. It could be said that, while looking for the "smoking gun", we were hit by the bullets themselves.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
