猎户座和W51射电偏振线的灵敏观测：与撞击增宽成比例的系统偏振线蓝移的数据和探测
Sensitive Observations of Radio Recombination Lines in Orion and W51: The Data and Detection of Systematic Recombination Line Blueshifts Proportional to Impact Broadening
摘要：
敏感的光谱观测近6.0和17.6 GHz的两个频段的猎户座和W51。使用频率切换，我们能够实现超过10，000的动态范围，而无需拟合正弦或多项式基线。这使我们能够检测到弱如T $_{A} ~1mK in these strong continuum sources. Hydrogen recombination lines with $ Δn$的谱线，在猎户座中检测到的谱线高达25。在猎户座的数据中，线更强，我们还检测到线中心频率与线宽成比例的系统性偏移，这不能用正常的光学深度效应来解释。
英文摘要：
Sensitive spectral observations made in two frequency bands near 6.0 and 17.6 GHz are described for Orion and W51. Using frequency switching we were able to achieve a dynamic range in excess of 10,000 without fitting sinusoidal or polynomial baselines. This enabled us to detect lines as weak as T$_{A} ~1mK in these strong continuum sources. Hydrogen recombination lines with $Δn$ as high as 25 have been detected in Orion. In the Orion data, where the lines are stronger, we have also detected a systematic shift in the line center frequencies proportional to linewidth that cannot be explained by normal optical depth effects.
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