AGN changes in the optical spectra and light changes between standard Is there some relationship?

活动星系核的光学谱变化与光变时标之间是否存在某种关系？

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On the basis of this, we apply the population synthesis method based on star cluster integrated spectra to some BCGs optical spectra.

在此基础上，我们运用恒星团星族合成方法，分析了一些蓝致密星系的光学谱。

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Mineral oil; Three-dimensional fluorescence spectra; Optical fiber sensing; Feature extraction; Tag sort; Quantitative analysis.

矿物油；三维荧光光谱；光纤传感；特征提取；特征分类；定量分析。

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Todd Boroson and Tod Lauer of the US National Optical Astronomy Observatory analysed some 17, 500 spectra from the Sloan Digital Sky Survey, and have now found just such a pair of emissions coming from a distant quasar.

BBC: Dancing black hole twins spotted