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首页> 外文期刊>Chinese Journal of Astronomy and Astrophysics >Isolated Main Galaxy Pairs from the SDSS Data Release 4
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Isolated Main Galaxy Pairs from the SDSS Data Release 4

机译：SDSS数据版本4中的隔离主要银河对

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摘要

From the Main galaxy data of the SDSS Data Release 4 (SDSS4), we have identified close galaxy pairs at neighbourhood radius R = 100 kpc by three-dimensional cluster analysis. Using the criterion that an "isolated galaxy pair" must be separated from its "nearest neighbor" by more than 500 kpc, we constructed an isolated galaxy pair sample of 1158 pairs. We also constructed a random pair sample by randomly selecting 1158 galaxy pairs from the Main galaxy sample, which has the same redshift distribution as the isolated galaxy pair sample, and in which the two components of any pair have the same redshifts. Comparative studies of luminosity and size between the members of the galaxy pairs are performed. We find and further confirm there is no tendency for paired galaxies to have similar luminosities or sizes. From the isolated pair sample we also selected a subsample with the magnitude limit of the primary raised by 2 magnitudes, so as to include pairs in which the secondary is 2 magnitudes fainter than the primary. This subsample contains 82 pairs. A random pair sample is similarly constructed.
机译：根据SDSS数据版本4（SDSS4）的主要星系数据，我们通过三维聚类分析确定了邻域半径R = 100 kpc的近距离星系对。使用必须将“孤立的星系对”与其“最近的邻居”相隔500 kpc以上的标准，我们构建了1158对的孤立的星系对样本。我们还通过从主星系样本中随机选择1158个星系对构造了一个随机对样本，该星对具有与孤立星系对样本相同的红移分布，并且其中任何一对的两个分量都具有相同的红移。进行了星系对成员之间的发光度和大小的比较研究。我们发现并进一步确认配对星系不存在具有相似亮度或大小的趋势。从隔离的对样本中，我们还选择了一个子样本，该样本的原边幅度极限提高了2个数量级，以便包括其中副边比原边模糊2个数量级的对。该子样本包含82对。类似地构造随机对样本。

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