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arXiv 2103.02896astro-ph.IM
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基于深度贝叶斯建模的恒星光谱去噪新方法

A novel stellar spectrum denoising method based on deep Bayesian modeling

Xin Kang, Shiyuan He, Yanxia Zhang

摘要:

光谱去噪是大规模光谱测量的重要步骤。提出了一种基于深度贝叶斯建模的恒星光谱去噪方法。我们的模型的构建包括每个恒星子类的先验分布,光谱发生器和基于流的噪声模型。我们的方法考虑了噪声相关结构,它不受强天空发射线和宇宙射线的影响。此外,它能够自然地处理光谱与丢失的通量值,而无需ad-hoc插补。该方法在斯隆数字巡天(SDSS)的真实恒星光谱上进行了评估,并列出了常见恒星子类的全面列表,并与标准去噪自动编码器进行了比较。我们的去噪方法在去噪质量和缺失通量填补方面表现出优于标准去噪自动编码器的性能。在数据预处理过程中应用该方法,可能有助于提高恒星分类和物理参数测量的精度。

英文摘要:

Spectrum denoising is an important procedure for large-scale spectroscopical surveys. This work proposes a novel stellar spectrum denoising method based on deep Bayesian modeling. The construction of our model includes a prior distribution for each stellar subclass, a spectrum generator and a flow-based noise model. Our method takes into account the noise correlation structure, and it is not susceptible to strong sky emission lines and cosmic rays. Moreover, it is able to naturally handle spectra with missing flux values without ad-hoc imputation. The proposed method is evaluated on real stellar spectra from the Sloan Digital Sky Survey (SDSS) with a comprehensive list of common stellar subclasses and compared to the standard denoising auto-encoder. Our denoising method demonstrates superior performance to the standard denoising auto-encoder, in respect of denoising quality and missing flux imputation. It may be potentially helpful in improving the accuracy of the classification and physical parameter measurement of stars when applying our method during data preprocessing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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