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arXiv 0812.2962astro-ph
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北天光学星团巡天III:一个包含π球面度的星团星表

The Northern Sky Optical Cluster Survey III: A Cluster Catalog Covering Pi Steradians

R. R. Gal, P. A. A. Lopes, R. R. de Carvalho, J. L. Kohl-Moreira, H. V. Capelato, S. G. Djorgovski

摘要:

我们提出了完整的星系团目录从北天光学星团巡天,一个新的,客观定义的候选星系团在z<0.25的目录从数字化第二帕洛玛天文台巡天(DPOSS)。这里提供的数据涵盖了南银河帽,以及北银河帽校准得不太好的区域。此外,由于改进了我们的集群发现者和测量方法,我们提供了一个更新的目录,为校准良好的北银河帽地区以前发表在论文II。完整的调查覆盖11,411平方度,超过15,000个候选集群。我们讨论了改进的光度红移,丰富度和光学光度提供给每个集群。各种子结构的措施计算的子集超过11,000个集群。我们还讨论了动力学半径r_200的推导及其与星系团丰度的关系。还介绍了调查的三个区域之间的一些一致性检查,证明了在不相交的天空区域的目录的均匀性。我们进行广泛的比较,现有的光学和X射线选择集群目录,并获得新的X射线光度和温度为我们的集群的一个子集。我们发现,光学和X射线光度是很好的相关性,即使使用相对较浅的ROSAT全天巡天和DPOSS数据。这次巡天为基于斯隆数字巡天数据的MaxBCG星表提供了一个很好的比较样本,并在低红移0.07<z<0.1处补充了该巡天。

英文摘要:

We present the complete galaxy cluster catalog from the Northern Sky Optical Cluster Survey, a new, objectively defined catalog of candidate galaxy clusters at z<0.25 drawn from the Digitized Second Palomar Observatory Sky Survey (DPOSS). The data presented here cover the Southern Galactic Cap, as well as the less-well calibrated regions of the Northern Galactic Cap. In addition, due to improvements in our cluster finder and measurement methods, we provide an updated catalog for the well-calibrated Northern Galactic Cap region previously published in Paper II. The complete survey covers 11,411 square degrees, with over 15,000 candidate clusters. We discuss improved photometric redshifts, richnesses and optical luminosities which are provided for each cluster. A variety of substructure measures are computed for a subset of over 11,000 clusters. We also discuss the derivation of dynamical radii r_200 and its relation to cluster richness. A number of consistency checks between the three areas of the survey are also presented, demonstrating the homogeneity of the catalog over disjoint sky areas. We perform extensive comparisons to existing optically and X-ray selected cluster catalogs, and derive new X-ray luminosities and temperatures for a subset of our clusters. We find that the optical and X-ray luminosities are well correlated, even using relatively shallow ROSAT All Sky Survey and DPOSS data. This survey provides a good comparison sample to the MaxBCG catalog based on Sloan Digital Sky Survey Data, and complements that survey at low redshifts 0.07<z<0.1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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