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Limits on Source Distances for the Most Energetic Cosmic Rays

机译:最高能宇宙射线的源距离限制

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The propagation of the highest energy cosmic rays through the 2?·7 K microwave background is considered. Photo-pion production interactions cause energy losses for primary cosmic ray protons which result in significant energy degradation over intergalactic distances. The process of energy loss is discussed and an estimate is made of the average distances travelled for observed cosmic rays with a range of energies, assuming a power law source spectrum. At energies over 1020 eV, the average distances travelled are a few tens of megaparsecs, limiting possible sources to the volume dominated by the supergalactic plane.
机译:考虑了最高能量的宇宙射线通过2?·7 K微波背景的传播。光电子产生的相互作用会导致主要宇宙射线质子的能量损失,从而导致整个星系间距离的能量明显下降。讨论了能量损失的过程,并假设了幂律源光谱,对观察到的宇宙射线在一定能量范围内的平均行进距离进行了估算。在能量超过1020 eV时,平均行进距离为几十兆帕,将可能的源限制在由超银河系飞机控制的体积内。

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