A Spectroscopic Catalog of 10 Distant Rich Clusters of Galaxies
A Spectroscopic Catalog of 10 Distant Rich Clusters of Galaxies
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DOI：
10.1086/313213
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发表时间：
1999-01
期刊：
影响因子：
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通讯作者：
A. Dressler;I. Smail;B. Poggianti;H. Butcher;W. Couch;R. Ellis;Augustus Oemler, Jr.
中科院分区：
文献类型：
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作者：
A. Dressler;I. Smail;B. Poggianti;H. Butcher;W. Couch;R. Ellis;Augustus Oemler, Jr.
我们介绍了10个遥远星系团的光谱观测，我们之前已经在哈勃太空望远镜上用WFPC2对这些星系进行了深度成像。这些星系团的红移范围为z=0.37-0.56，是一项详细的地面和空间研究的对象，目的是调查星系随环境和纪元的演化。这里给出的数据包括10个星系团领域中657个星系的位置、光度、红移、谱线强度和分类。星表由来自10个星系团和233个外场星系的424个星系团成员组成，其中204个星系团和71个外场星系的详细形态信息来自我们的WFPC2图像。我们说明了星表的一些基本属性，包括我们的大样本星系团的形态和光谱属性之间的相关性。对高红移星系团和场群的光谱性质的直接比较表明，在其他被动星系(通常称为E+A，但在这里更名为k+a类)中的强巴尔默线现象显示，在丰富的星系团环境中，与场群的较温和增长相比，强巴尔默线增加了数量级。这表明，产生k+a星系所涉及的一个或多个过程要么在星系团环境中更有效，要么这个环境延长了这一阶段的能见度。Poggianti等人对这些数据进行了更详细的分析和建模。
We present spectroscopic observations of galaxies in the fields of 10 distant clusters for which we have previously presented deep imaging with WFPC2 on board the Hubble Space Telescope. The clusters span the redshift range z=0.37-0.56 and are the subject of a detailed ground- and space-based study to investigate the evolution of galaxies as a function of environment and epoch. The data presented here include positions, photometry, redshifts, spectral line strengths, and classifications for 657 galaxies in the fields of the 10 clusters. The catalog is composed of 424 cluster members across the 10 clusters and 233 field galaxies, with detailed morphological information from our WFPC2 images for 204 of the cluster galaxies and 71 in the field. We illustrate some basic properties of the catalog, including correlations between the morphological and spectral properties of our large sample of cluster galaxies. A direct comparison of the spectral properties of the high-redshift cluster and field populations suggests that the phenomenon of strong Balmer lines in otherwise passive galaxies (commonly called E + A but renamed here as the k + a class) shows an order-of-magnitude increase in the rich cluster environment compared with a more modest increase in the field population. This suggests that the process or processes involved in producing k + a galaxies are either substantially more effective in the cluster environment or that this environment prolongs the visibility of this phase. A more detailed analysis and modeling of these data is presented in Poggianti et al.