估算精细结构常数（α）随宇宙时间变化的校准问题
Calibration issues in estimating variability of the fine structure constant (alpha) with cosmic time
摘要：
激光梳波长校准表明，ThAr波长校准在一个量级范围内可能存在高达100 m/s的偏差，但总体精度为1 m/s（Wilken等人，2009年）。这种偏差对应于FeII-Mg II对的Δ α/α ~ 7 E-6。5 FeII线之间的线位移的比较，具有几乎相同的灵敏度，精细结构常数的变化，提供了一个干净的方式来直接测试可能的本地波长校准误差的存在，无论起源。我们分析了5个吸收系统，对3个明亮的类星体的zab范围从1.15到2.19。结果表明，虽然一些线在20 m/s内对齐，但其他线显示出达到200 m/s或更高的大偏差，对应于Δ α/α> 1 E-5水平。这些偏差的起源并不清楚，但可能与波长校准适应CCD制造不规则性有关。这些结果表明，从基于一条或仅几条线的Δ α/α分析中得出结论必须非常小心。
英文摘要：
Laser Comb Wavelength calibration shows that the ThAr one is locally unreliable with possible deviations of up to 100 m/s within one order range, while delivering an overall 1 m/s accuracy (Wilken et al 2009). Such deviation corresponds to delta alpha/alpha ~ 7E-6 for a FeII-MgII pair. Comparison of line shifts among the 5 FeII lines, with almost identical sensitivity to fine structure constant changes, offers a clean way to directly test the presence of possible local wavelength calibration errors of whatever origin. We analyzed 5 absorption systems, with zabs ranging from 1.15 to 2.19 towards 3 bright QSOs. The results show that while some lines are aligned within 20 m/s, others reveal large deviations reaching 200 m/s or higher and corresponding to a delta alpha/alpha > 1E-5 level. The origin of these deviations is not clearly identified but could be related to the adaptation of wavelength calibration to CCD manufacturing irregularities. These results suggest that to draw conclusions from delta alpha/alpha analysis based on one or only few lines must be done with extreme care.
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