论文标题
对宇宙无线电背景的更新估计及其对超高能光子传播的影响
An updated estimate of the cosmic radio background and implications for ultra-high-energy photon propagation
论文作者
论文摘要
我们提出了宇宙无线电背景（CRB）的更新估计值以及超高能量光子的相应衰减长度。该新估计提供了相关的不确定性，这是从关键物理参数上观察性约束得出的频率的函数。我们还介绍了CRB光谱的预期变化，以及这些参数的函数，并考虑了射电星系群体之间光谱指数的预期变化。与以前的计算相比，这项工作中提出的新估计与无线电源计数测量的观察性约束更好。在我们期望CRB占主导地下衰减的宇宙基因光子的能量状态下，我们对衰减长度的计算与以前的估计值不同，最高为3倍，具体取决于能量和比较的特定模型。这些结果表明，具有能量$ \ sim 10^{19} -10^{20} $ eV的宇宙基因光子的预期数量减少。
We present an updated estimate of the cosmic radio background (CRB) and the corresponding attenuation lengths for ultra-high energy photons. This new estimate provides associated uncertainties as a function of frequency derived from observational constraints on key physical parameters. We also present the expected variation in the spectrum of the CRB as a function of these parameters, as well as accounting for the expected variation in spectral index among the population of radio galaxies. The new estimate presented in this work shows better agreement with observational constraints from radio source-count measurements than previous calculations. In the energy regime where we expect cosmogenic photons dominantly attenuated by the CRB, our calculation of the attenuation length differs from previous estimates by a factor of up to 3, depending on energy and the specific model for comparison. These results imply a decrease in the expected number of cosmogenic photons with energies $\sim 10^{19}-10^{20}$ eV.
