论文标题
超高能量宇宙射线核的能量学
Energetics of ultrahigh-energy cosmic-ray nuclei
论文作者
论文摘要
宇宙中产生的超高能量宇宙射线（UHECR）的能量学对于固定其候选资源至关重要。使用最近的UHECR光谱的螺旋钻数据，我们通过对光谱指数，最大能量和红移进化的源参数进行扫描，计算注射时不同物种核的UHECR能量产生速率密度，以及质子。我们发现所得的UHECR能源产生速率密度为$ \ of（0.2-2）\ times $ 10 $^{44} $ 〜ERG〜MPC $^{ - 3} $ 〜yr $^{ - 1} $ at $ 10^{19.5} $ 〜ev，具有非整体依赖性依赖于光谱索引。除质子和熨斗以外，在注射时有利于硬光谱指数，并且中间核的能量预算的所需值较小。鉴于银河系 - 乳腺癌过渡的HADRONIC相互作用模型和天体物理模型的明显不确定性，我们的结果可以被认为是保守的。 $ x _ {\ rm max} $上的构图数据给出了其他约束，但是在模型不确定性中结果是一致的。
Energetics of the ultrahigh-energy cosmic rays (UHECRs) generated in the universe is crucial for pinning down their candidate sources. Using the recent Auger data on UHECR spectra, we calculate the UHECR energy generation rate density for different species of nuclei at the injection, considering intermediate and heavy nuclei as well as protons, through scanning over source parameters on the spectral index, maximum energy and redshift evolution. We find the resulting UHECR energy generation rate density to be $\approx(0.2-2)\times$10$^{44}$~erg~Mpc$^{-3}$~yr$^{-1}$ at $10^{19.5}$~eV with a nontrivial dependence on the spectral index. Nuclei other than protons and irons favor hard spectral indices at the injection, and the required value of energy budget is smaller for intermediate nuclei. Given significant uncertainties in hadronic interaction models and astrophysical models for the Galactic-extragalactic transition, our results can be regarded as conservative. The composition data on $X_{\rm max}$ give additional constraints, but the results are consistent within the model uncertainties.
