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arXiv 2511.09406astro-ph.HE
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明亮宇宙线源作为解决Auger-TA张力的方案

Bright Cosmic-Ray Source as a Solution to Auger-TA Tensions

Université de Paris Cite(巴黎 Cité 大学);CNRS, Astroparticule et Cosmologie(法国国家科学研究中心,粒子物理与宇宙学研究所)

Alexander Korochkin, Dmitri Semikoz, Peter Tinyakov

AI总结:

针对Auger与TA在超高能宇宙线能谱上的差异,提出单个邻近源叠加各向同性背景的模型,结合磁偏转效应解释TA超额并复现偶极偏移,最佳源位置靠近星暴星系M82,与现有观测拟合一致。

摘要:

皮埃尔·奥格观测站(Auger)和望远镜阵列(TA)测量的超高能宇宙线(UHECR)能谱在10¹⁹.⁵ eV以下吻合良好,但在更高能量处存在显著差异。我们表明,这些差异可通过叠加在近各向同性背景上的单个邻近源解释。考虑银河系和河外磁场的偏转效应,此类源可解释TA能谱的超额部分,且不会产生过度各向异性。源所需的硬能谱和中等质量成分与此前仅针对Auger能谱和成分的拟合结果一致。该场景具有多项额外优势:(i)源产生的宽超额部分与TA热点重叠,为其提供可能解释;(ii)无需额外调参即可复现仅Auger分析与Auger-TA联合分析之间观测到的约90°偶极方向偏移;(iii)源的最佳拟合位置靠近M82(最亮的邻近星暴星系),使其成为UHECR的合理源。

英文摘要:

The ultra-high-energy cosmic ray (UHECR) spectra measured by the Pierre Auger Observatory (Auger) and the Telescope Array (TA) agree very well below $10^{19.5}$ eV but differ significantly at higher energies. We show that these differences can be explained by a single nearby source superimposed on a nearly isotropic background. Taking into account deflections in Galactic and extragalactic magnetic fields, such a source can account for the excess in the TA spectrum without producing excessive anisotropy. The required hard spectrum of the source and intermediate-mass composition are consistent with previous fits of the Auger-only spectrum and composition. This scenario offers several additional advantages: (i) the source produces a broad excess partially overlapping the TA hotspots, suggesting their possible explanation; (ii) without additional tuning, it reproduces the $\sim90^\circ$ shift in dipole direction observed between the Auger-only and combined Auger-TA analyses; and (iii) the best-fit position of the source lies near M82, the brightest nearby starburst galaxy, making it a plausible source of the UHECR.

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。

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