从GeV到PeV：天鹅座X-3的轨道调制与风调控超高能辐射
From GeV to PeV: Orbital Modulation and Wind-Regulated Ultrahigh-energy Emission in Cygnus~X-3
- School of Astronomy and Space Science, Nanjing University（南京大学天文与空间科学学院）
- Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education（教育部现代天文学和天体物理学重点实验室（南京大学））
- Tianfu Cosmic Ray Research Center（天府宇宙线研究中心）
- State Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所粒子天体物理国家重点实验室）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究针对天鹅座X-3的超高能伽马射线辐射，构建通用双星喷流模型，揭示其辐射受吸积驱动的风结构调控，为关联其历史PeV活动与双星吸积状态提供了可能。
AI中文摘要：
近期LHAASO观测发现天鹅座X-3存在超高能（UHE）伽马射线辐射，且呈现轨道调制特征，为研究双星尺度上的粒子加速与传输提供了罕见契机。我们构建了一个通用的双星喷流模型，可同时解释同期GeV至PeV能段的光谱与轨道光变曲线。GeV辐射由相对论电子对恒星光子的各向异性逆康普顿散射产生，而从内区逃逸的多PeV质子通过光强子与强子核相互作用产生TeV至PeV伽马射线。GeV轨道调制约束了双星喷流的几何结构，使超高能观测能够探测逃逸质子群及其与双星周环境的相互作用。我们发现超高能辐射受吸积驱动的风结构强烈调控：在当前状态下，高速盘风将致密得多的沃尔夫-拉叶星（WR）风从逃逸质子的轨迹中大量移开，抑制了强子核辐射；盘风的强度、准直度或取向变化，可使逃逸质子暴露于致密得多的WR风中，将PeV伽马射线光度提升数个数量级。这为20世纪80年代报道的更明亮但未被证实的PeV活动提供了可能的关联，并将超高能伽马射线活动与双星的吸积及外流状态联系起来。
英文摘要：
Recent LHAASO observations reveal ultrahigh-energy (UHE) gamma-ray emission from Cygnus~X-3 with evidence for orbital modulation, providing a rare opportunity to study particle acceleration and transport on binary scales. We develop a common binary--jet model that jointly explains the contemporaneous GeV--PeV spectra and orbital light curves. The GeV emission is produced by anisotropic inverse-Compton scattering of stellar photons by relativistic electrons, while multi-PeV protons escaping from the inner region produce TeV--PeV gamma rays through photohadronic and hadronuclear interactions. The GeV orbital modulation constrains the binary--jet geometry, allowing the UHE observations to probe the escaping proton population and its interaction with the circum-binary environment. We find that the UHE emission is strongly regulated by the accretion-driven wind structure. In the present state, a fast disk wind displaces much of the denser Wolf--Rayet (WR) wind from the escaping-proton trajectories, suppressing hadronuclear emission. Changes in the strength, collimation, or orientation of the disk wind can expose the escaping protons to a much denser WR wind and enhance the PeV gamma-ray luminosity by orders of magnitude. This provides a possible connection to the much brighter, though unconfirmed, PeV activity reported in the 1980s, and links UHE gamma-ray activity to the accretion and outflow state of the binary.
