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A Wide-Field, Broadband Imaging Survey of Butcher-Oemler Cluster Cl 0024+1654: The Catalog*

机译:Butcher-Oemler簇Cl 0024 + 1654的宽频宽带成像调查:目录*

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摘要

Wide-field (20' × 20') UBVI images of intermediate-redshift (z = 0.39), Butcher-Oemler cluster Cl 0024+1654 have been obtained. These data probe the rest-frame mid-UV properties over a much larger area than previous studies of Cl 0024+1654. Using these data, a multicolor catalog of nonstellar objects, assumed to be galaxies, has been constructed and analyzed. Using statistical arguments, the observed galaxy sample is separated into field and cluster populations. The basic photometric properties of these populations are presented and discussed. The "dropout" objects (i.e., objects undetected in one or more photometric bands) in our catalog are also discussed. A description of the final UBVI images, as well as the object catalog, is provided in an appendix. In a second appendix the use of SExtractor in crowded fields, such as the core of Cl 0024+1654, is discussed. The specific issues of the mid-UV properties of red envelope cluster galaxies, as well as the possible detection of a faint blue cluster population, are discussed in a forthcoming companion paper by Silva, Alexov, & Pierce.
机译:已获得中等红移(z = 0.39),Butcher-Oemler簇Cl 0024 + 1654的广域(20'×20')UBVI图像。这些数据比以前对Cl 0024 + 1654的研究在更大的范围内探测了其余帧的中紫外线特性。利用这些数据,已经构造并分析了假设为星系的非恒星物体的多色目录。使用统计参数,将观测到的星系样本分为野外种群和集群种群。介绍并讨论了这些种群的基本光度学特性。还讨论了目录中的“丢失”对象(即在一个或多个光度学带中未检测到的对象)。附录中提供了最终UBVI映像的描述以及对象目录。在第二个附录中,讨论了SExtractor在拥挤领域(例如Cl 0024 + 1654的核心)中的使用。 Silva,Alexov和Pierce在即将发表的同伴论文中讨论了红包络星系的中紫外线特性的特定问题,以及可能检测到微弱的蓝色团簇的问题。

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