在银心距1.5 < D_GC < 13千秒差距的银河系中，来自甲醇（CH₃OH）热谱线的μ变化约束
Constraints on mu-variations from the methanol CH3OH thermal lines in the Galaxy at galactocentric distances of 1.5 < D_GC < 13 kpc
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中文总结 AI 辅助
本研究通过分析银心距1.5至13千秒差距的7个巨分子云的甲醇热谱线，对电子-质子质量比μ的变化设定约束，得出其加权平均值无显著变化的结论，与此前上限吻合。
中文摘要 AI 辅助
本研究基于216-220吉赫兹频率范围内E-甲醇（CH₃OH）的热发射谱线，对基本物理常数μ（即电子-质子质量比，μ = m_e/m_p）的假设性变化设定约束。研究分析了位于宽银心距范围（1.5 < D_GC < 13千秒差距）的7个巨分子云的分子光谱。所得加权平均值<Δμ/μ> = (0.5±0.5)×10⁻⁷，在5×10⁻⁸的1σ置信水平下，未显示μ存在统计学意义上的显著变化，这与此前在银盘多个分子云中确立的上限吻合良好。
英文摘要
In this study, constraints are set on hypothetical variations of the fundamental physical constant mu = m_e/m_p - the electron-to-proton mass ratio - based on thermal emission lines of E-methanol (CH3OH) in the 216-220 GHz frequency range. Molecular spectra toward seven massive clouds located across a wide range of galactocentric distances (1.5 < D_GC < 13 kpc) have been analyzed. The obtained weighted mean value <Delta mu/mu> = (0.5+/-0.5)*10^(-7) does not indicate statistically significant changes in mu at the 1 sigma confidence level of 5*10^(-8), which is in good agreement with previously established upper limits in a number of molecular clouds in the Galactic disk.
