Abstract—The correlations of the color indices of central galaxies (M_r < –20.7) and their faint neighboring galaxies (M_r < –20.7) using the sample based on the SDSS DR9 (N = 60 561) have been studied. The galaxy sample was limited by the red shift 0.02 < z ≤ 0.06 and absolute magnitude –24^m < M_r < –19.4^m. The “Random Forest” method of machine learning was used to determine the morphological type of the galaxies. The statistically significant correlation was found only for the “central galaxies–nearest neighbor galaxy” pairs in which the distance between the components is less than 100 kpc and each of the components is an early type galaxy. The obtained results testify to the hierarchical scenario of the evolution of galaxies.

中文翻译：

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SDSS DR9星系在0.02 <z≤0.06时的形态类型和颜色指标

摘要—使用基于SDSS DR9（N = 60561）的样本，研究了中央星系（M _r <–20.7）和其暗淡的邻近星系（M _r <–20.7）的颜色指数之间的相关性。星系样品通过红移0.02限于< Ž ≤0.06和绝对幅值-24^米<中号_[R <-19.4^米。机器学习的“随机森林”方法用于确定星系的形态类型。仅在“中心星系-最近邻星系”对中发现了统计上显着的相关性，其中组件之间的距离小于100 kpc，并且每个组件都是早期类型的星系。获得的结果证明了星系演化的分层场景。