AI 中文总结
研究利用 QCD 轴子转换光子解释壮丽七颗中子星之一的硬 X 射线数据，采用核子 - 核子轫致辐射及库珀对破坏与形成过程，对比常用模型，发现微电子伏特尺度增强模型更吻合数据，可解释 2 - 8 千电子伏特硬 X 射线发射。
AI 中文摘要
我们探讨了利用 QCD 轴子转换光子来解释从壮丽七颗中子星之一获得的硬 X 射线数据的可能性。考虑了来自核心的热轴子与中微子的发射。我们采用核子 - 核子轫致辐射过程作为基线轴子产生机制，并将库珀对破坏与形成（PBF）作为附加过程。研究选择性增强的 QCD 轴子耦合模型是否比常用的 KSVZ 轴子模型能更好地解释硬 X 射线过剩。结果表明，毫电子伏特质量的 QCD 轴子在所采用框架内无法解释硬 X 射线观测结果。微电子伏特尺度下的增强选择性模型与硬 X 射线数据更吻合。由此得出，孤立壮丽七颗星在 2 - 8 千电子伏特范围内的硬 X 射线发射可由 QCD 轴子在增强耦合情形下解释。
英文摘要
We explore the possibility of explaining hard X-ray data obtained from one of the Magnificent Seven (M7) neutron-stars (NSs) employing QCD axion-converted photons. The emission of thermal axions along with neutrinos from the core has been considered. We adopt the nucleon-nucleon bremsstrahlung process as the baseline axion production mechanism and Cooper-pair breaking and formation (PBF) as an additional process. We investigate here whether the selectively enhanced QCD axion coupling model can better explain the hard X-ray excess than the commonly used KSVZ axion model. Our results suggest that meV-mass QCD axions cannot explain the hard X-ray observation within the adopted framework. The enhanced selective model in the micro-eV scale provides closer agreement with the hard X-ray data. We thus conclude that the emission of hard X-rays in the $2-8$ keV range from isolated M7 stars could be explained by QCD axions under an enhanced coupling scenario.
