X射线与伽马射线光谱偏振数据的统一建模：以天鹅座X-1为例
A unified modeling of X-ray and gamma-ray spectro-polarimetric data: the case of Cygnus X-1
浏览论文内容
中文总结 AI 辅助
本文提出宽带光谱偏振建模通用框架，应用于天鹅座X-12 keV-2 MeV能段，精准表征软伽马射线硬尾、约束同步辐射截断能量，为偏振失配提供新解释，适用于多仪器分析。
中文摘要 AI 辅助
近期对黑洞X射线双星（如天鹅座X-1）的X射线与软伽马射线光谱偏振观测，揭示出与当前吸积及高能辐射模型不符的差异。本文提出一种宽带光谱偏振建模的通用框架，可同时拟合不同能量波段下独立仪器获取的光谱与偏振数据；该方法能稳健整合能量分箱、统计显著性各异的测量结果，同时考虑模型成分间与能量相关的偏振混合效应。将其应用于天鹅座X-1的2 keV-2 MeV能段，可更精准表征软伽马射线硬尾，并将光薄同步辐射截断能量约束为(3.9⁺⁰.⁶₋₀.₅)×10² keV。本文还结合玻姆扩散与同步辐射冷却，探讨了其对非热电子加速的启示，并基于磁场螺旋度与多普勒增亮，为观测到的偏振失配提出新解释；该框架广泛适用于多仪器光谱偏振分析。
英文摘要
Recent X-ray and soft gamma-ray spectro-polarimetric observations of black hole X-ray binaries, such as Cygnus X-1, reveal discrepancies that challenge current models of accretion and high-energy emission. We present a general framework for broadband spectro-polarimetric modeling that simultaneously fits spectral and polarization data from independent instruments across different energy bands. The method robustly combines measurements with different energy binning and statistical significance while accounting for energy-dependent polarization mixing between model components. Applied to Cygnus X-1 over the 2 keV-2 MeV range, it provides an improved characterization of the soft gamma-ray hard-tail and constrains the optically thin synchrotron cutoff energy to $(3.9^{+0.6}_{-0.5}) \times 10^{2}$ keV. We discuss the implications for non-thermal electron acceleration in the context of Bohm diffusion and synchrotron cooling, and propose a new explanation for the observed polarization misalignment based on magnetic field helicity and Doppler boosting. The framework is broadly applicable to multi-instrument spectro-polarimetric analyses.
