Substructure in Clusters Containing Wide-Angle-Tailed Radio Galaxies. I. New Redshifts
Substructure in Clusters Containing Wide-Angle-Tailed Radio Galaxies. I. New Redshifts
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DOI：
10.1086/316829
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发表时间：
2000-11
期刊：
影响因子：
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通讯作者：
J. Pinkney;J. Burns;M. Ledlow;P. Gomez;J. Hill
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文献类型：
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作者：
J. Pinkney;J. Burns;M. Ledlow;P. Gomez;J. Hill
我们提出了新的红移和位置的635个星系在9个丰富的星系团包含广角尾（WAT）射电星系。结合现有的数据，我们现在有一个样本的18个瓦特含有超过10个红移的星系团。该样本包含阿贝尔星团VLA 20 cm巡天中的大部分WAT星团，包括完整巡天中75%的WAT星团（z ≤ 0.09）和20%的z > 0.09的WAT星团。这是一个代表性的样本，除了通过无线电形态学进行选择外，不应包含偏见。我们用直方图和天空图以图形方式呈现新数据。一个半自动化的程序是用来搜索光谱中的发射线，以添加和验证星系红移。我们发现，发射线星系的平均视分数是约9%的集群和领域。我们调查的幅度完整性，我们的红移调查与CCD数据的测试情况下，阿贝尔690。这种情况表明，我们的星系目标列表比典型的MX曝光的检测极限更深，并且它们在R = 19.0时完成了82%。假设目标上的纤维的位置的均匀性的重要性，我们评估这在我们的数据集。我们发现一些情况下的非均匀性，这可能会影响动力学分析。第二篇论文将使用这个数据库来寻找WAT无线电形态和集群的动力学状态之间的相关性。
We present new redshifts and positions for 635 galaxies in nine rich clusters containing wide-angle tailed (WAT) radio galaxies. Combined with existing data, we now have a sample of 18 WAT-containing clusters with more than 10 redshifts. This sample contains a substantial portion of the WAT clusters in the VLA 20 cm survey of Abell clusters, including 75% of WAT clusters in the complete survey (z ≤ 0.09), and 20% of WAT clusters with z > 0.09. It is a representative sample, which should not contain biases other than selection by radio morphology. We graphically present the new data using histograms and sky maps. A semiautomated procedure is used to search for emission lines in the spectra in order to add and verify galaxy redshifts. We find that the average apparent fraction of emission-line galaxies is about 9% in both the clusters and the field. We investigate the magnitude completeness of our redshift surveys with CCD data for a test case, Abell 690. This case indicates that our galaxy target lists are deeper than the detection limit of a typical MX exposure, and they are 82% complete down to R = 19.0. The importance of the uniformity of the placement of fibers on targets is posited, and we evaluate this in our data sets. We find some cases of nonuniformities which may influence dynamical analyses. A second paper will use this database to look for correlations between the WAT radio morphology and the cluster's dynamical state.