Ia型超新星光谱特征的量化
Quantifying Spectral Features of Type Ia Supernovae
摘要：
我们引入了一种新的技术来量化高度结构化的光谱，在所观察到的通量谱的连续或光谱特征的定义是困难的。该方法采用小波变换，它允许所观察到的光谱分解成不同的尺度。制定一个程序来定义的光谱特征的强度，使测得的光谱指数是独立的通量水平，是不敏感的连续的定义，也红化。这种技术适用于Ia型超新星光谱，其中光度和光谱特征之间的相关性被揭示出来。目前的技术可以允许光度校正的基础上的光谱特征的使用Ia型超新星作为宇宙学探测。
英文摘要：
We introduce a new technique to quantify highly structured spectra for which the definition of continua or spectral features in the observed flux spectra is difficult. The method employs wavelet transformation which allows the decomposition of the observed spectra into different scales. A procedure is formulated to define the strength of spectral features so that the measured spectral indices are independent of the flux levels and are insensitive to the definition of continuum and also to reddening. This technique is applied to Type Ia supernovae spectra, where correlations are revealed between the luminosity and spectral features. The current technique may allow for luminosity corrections based on spectral features in the use of Type Ia supernovae as cosmological probe.
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