Environmental Dependence of Different Colors for the Apparent Magnitude-Limited Main Galaxy Sample of the SDSS DR7
Environmental Dependence of Different Colors for the Apparent Magnitude-Limited Main Galaxy Sample of the SDSS DR7
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DOI：
10.1515/astro-2017-0153
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发表时间：
2013
期刊：
影响因子：
0.7
通讯作者：
Xinfa Deng;Cheng-Hong Luo;Yong Xin;Ping Wu
中科院分区：
文献类型：
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作者：
Xinfa Deng;Cheng-Hong Luo;Yong Xin;Ping Wu
摘要利用斯隆数字巡天数据发布的视星等限制的主星系样本，研究了u-r、u-g、g-r、r-i和i-z颜色的环境依赖性。这五种颜色都与局地环境密切相关：红色星系倾向于位于密度较高的区域，而蓝色星系则倾向于位于低密度区域。我们还注意到，随着红移的增加，星系颜色的环境依赖性变弱，特别是在高红移区(z在0.17-0.20之间)。这可以解释为高红移的子样本只包含发光星系和红色星系。
Abstract The apparent magnitude-limited Main galaxy sample of the Sloan Digital Sky Survey Data Release 7 is used to investigate the environmental dependence of u–r, u–g, g–r, r–i and i–z colors. All the five colors strongly correlate with the local environment: red galaxies tend to be located in dense regions, while blue galaxies tend to be located in low density regions. We also note that with increasing of redshift, the environmental dependence of galaxy colors becomes weaker, especially in the high redshift region (z between 0.17 and 0.20). This can be explained accepting that subsamples with high redshifts contain only luminous and red galaxies.