THE DEPENDENCE OF LUMINOSITY AND g − r COLOR ON THE ENVIRONMENT FOR THE SAME MORPHOLOGICAL TYPES
THE DEPENDENCE OF LUMINOSITY AND g − r COLOR ON THE ENVIRONMENT FOR THE SAME MORPHOLOGICAL TYPES
复制标题
DOI：
10.1088/0004-637x/693/2/l71
复制
发表时间：
2009-02
期刊：
影响因子：
--
通讯作者：
Xinfa Deng;Ji-zhou He;Xiao-Qing Wen
中科院分区：
文献类型：
--
作者：
Xinfa Deng;Ji-zhou He;Xiao-Qing Wen
我们将斯隆数字巡天数据第6版（SDSS DR6）的体积有限的主星系样本分为早型样本和晚型样本，研究了相同形态类型的亮度和g - r颜色对环境的依赖关系。对于每个样本，我们在到第五个最近邻居的距离内测量的局部密度的两个极端处构建两个子样本。结果表明，对于早型样品和晚型样品，g−r颜色与环境之间仍然存在显著的相关性，但晚型样品的相关性要比早型样品强得多。我们的研究还表明，光度对局部环境的依赖性主要是由于星系形态对局部环境的依赖性以及星系形态与光度之间的相关性。
We divide the volume-limited main galaxy sample of the Sloan Digital Sky Survey Data Release 6 (SDSS DR6) into two samples—the early-type sample and the late-type sample—to investigate the dependence of luminosity and g − r color on the environment for the same morphological types. For each sample, we construct two subsamples at both extremes of local density which is measured within the distance to the fifth nearest neighbor. It turns out that, for the early-type sample and the late-type sample, significant correlation between g − r color and the environment still exists, but the correlation in the late-type sample is much stronger than that in the early-type sample. Our studies also suggest that the dependence of luminosity on the local environment is mainly due to the dependence of galaxy morphologies on the local environment and the correlation between morphologies and luminosity.