通过非参数技术揭示星系人口的组成
Revealing components of the galaxy population through nonparametric techniques
摘要：
星系属性的分布随环境而变化，并且通常是多峰的，这表明星系群可能是多个成分的组合。这些组成部分与环境的关系包含了星系发展过程的细节。为了释放这些信息，我们采用了一种新的，非参数统计技术，确定存在于星系H $α$发射线等效宽度分布的四个组件。我们解释这些组件作为被动的，恒星形成，和两个品种的活动星系核。独立于这种解释，每个组件的属性是显着恒定的环境功能。只有它们的相对比例显示出很大的差异。因此，星系群似乎包括独立于环境的不同组成部分，当它们进入更密集的环境时，星系在组成部分之间迅速过渡。
英文摘要：
The distributions of galaxy properties vary with environment, and are often multimodal, suggesting that the galaxy population may be a combination of multiple components. The behaviour of these components versus environment holds details about the processes of galaxy development. To release this information we apply a novel, nonparametric statistical technique, identifying four components present in the distribution of galaxy H$α$ emission-line equivalent-widths. We interpret these components as passive, star-forming, and two varieties of active galactic nuclei. Independent of this interpretation, the properties of each component are remarkably constant as a function of environment. Only their relative proportions display substantial variation. The galaxy population thus appears to comprise distinct components which are individually independent of environment, with galaxies rapidly transitioning between components as they move into denser environments.
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