Colour and spectral index from the SLUGGS survey

As part of the SAGES Legacy Unifying Globulars and GalaxieS (SLUGGS) survey, we stack 1137 Keck DEIMOS (Deep Imaging Multi-Object Spectrograph) spectra of globular clusters from...作为SAGES统一球状星团与星系遗留（SAGES Legacy Unifying Globulars and GalaxieS，缩写SLUGGS）巡天项目的组成部分，我们对来自……的1137条球状星团的凯克（Keck）DEIMOS（深度成像多目标光谱仪，Deep Imaging Multi-Object Spectrograph）光谱进行了堆叠处理。