谱线数据的平均方法

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
L. D. Anderson, B. Liu, Dana. S. Balser, T. M. Bania, L. M. Haffner, Dylan J. Linville, Matteo Luisi, Trey V. Wenger
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引用次数: 0

摘要

理想的谱平均方法取决于一个人的科学目标和数据的可用信息。在平均值中加入低质量数据会降低信噪比(S/N),这可能需要优化方法或考虑不同的加权方案。在这里,我们探讨了各种光谱平均方法。我们研究了在平均过程中使用的三种加权方案:信号除以方差的加权(“强度-噪声加权”),方差的逆加权(“噪声加权”)和均匀加权。而对于强噪加权,当对所有谱进行平均时,信噪比最大;对于噪声和均匀加权,我们发现对最高信噪比的35%-45%谱进行平均,会得到最高的信噪比平均谱。有了这个强度截止值,具有噪声或均匀加权的平均频谱具有由强度-噪声加权产生的频谱强度的约95%。我们将我们的光谱平均方法应用于GBT漫射电离气体氢无线电复合线数据,以确定离子丰度比,y +,并讨论了该方法的未来应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Methods for Averaging Spectral Line Data
Abstract The ideal spectral averaging method depends on one’s science goals and the available information about one’s data. Including low-quality data in the average can decrease the signal-to-noise ratio (S/N), which may necessitate an optimization method or a consideration of different weighting schemes. Here, we explore a variety of spectral averaging methods. We investigate the use of three weighting schemes during averaging: weighting by the signal divided by the variance (“intensity-noise weighting”), weighting by the inverse of the variance (“noise weighting”), and uniform weighting. Whereas for intensity-noise weighting the S/N is maximized when all spectra are averaged, for noise and uniform weighting we find that averaging the 35%–45% of spectra with the highest S/N results in the highest S/N average spectrum. With this intensity cutoff, the average spectrum with noise or uniform weighting has ∼95% of the intensity of the spectrum created from intensity-noise weighting. We apply our spectral averaging methods to GBT Diffuse Ionized Gas hydrogen radio recombination line data to determine the ionic abundance ratio, y + , and discuss future applications of the methodology.
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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