arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1012.3470astro-ph.CO
收藏

红序列星系团巡天-2(RCS-2):巡天细节和光度星表的建立

The Red-sequence Cluster Survey-2 (RCS-2): survey details and photometric catalog construction

David G. Gilbank, M. D. Gladders, H. K. C. Yee, B. C. Hsieh

摘要:

第二次红色序列星团巡天(RCS-2)是一次~1000平方度的多色成像巡天,使用加拿大-法国-夏威夷望远镜(CFHT)上的平方度成像仪MegaCam。它被设计用来探测红移范围为0.1<~z<~1的星系团。主要目标是建立一个统计上完整的,大的(~10^4)星系团样本,覆盖足够长的红移基线,以便能够通过星系团质量函数的演化来限制宇宙学参数。其他主要的科学目标包括建立一个大样本的高表面亮度,强烈的引力透镜弧与这些星系团,和一个前所未有的样本的数万个星系团和团体,跨越大范围的晕质量,与研究其成员星系的性质和演化。本文介绍了调查的设计以及为制作高精度光度计目录而获取、减少和校准数据的方法。我们描述了使用恒星轨迹的颜色和重叠的2微米全天巡天(2 MASS)测光校准我们的Griz成像数据的方法。这就产生了任何颜色的绝对精度<0.03等,r波段的绝对精度约为0.05等,并通过斯隆数字巡天(SDSS)进行了验证。RCS-2达到平均5 sigma点源极限星等griz = [24.4,24.3,23.7,22.8],比SDSS深约1-2个星等。由于观测的时间表性质,数据是高度均匀的,并且具有良好的视宁度,在r波段大多数FWHM<~0.7”。除了刚刚描述的主要科学目标外,这些数据还构成了许多其他计划和正在进行的项目(包括WiggleZ调查)的基础,使RCS-2成为重要的下一代成像调查。[删节]

英文摘要:

The second Red-sequence Cluster Survey (RCS-2) is a ~1000 square degree, multi-color imaging survey using the square-degree imager, MegaCam, on the Canada-France-Hawaii Telescope (CFHT). It is designed to detect clusters of galaxies over the redshift range 0.1<~z<~1. The primary aim is to build a statistically complete, large (~10^4) sample of clusters, covering a sufficiently long redshift baseline to be able to place constraints on cosmological parameters via the evolution of the cluster mass function. Other main science goals include building a large sample of high surface brightness, strongly gravitationally-lensed arcs associated with these clusters, and an unprecedented sample of several tens of thousands of galaxy clusters and groups, spanning a large range of halo mass, with which to study the properties and evolution of their member galaxies. This paper describes the design of the survey and the methodology for acquiring, reducing and calibrating the data for the production of high-precision photometric catalogs. We describe the method for calibrating our griz imaging data using the colors of the stellar locus and overlapping Two-Micron All-Sky Survey (2MASS) photometry. This yields an absolute accuracy of <0.03 mag on any color and ~0.05 mag in the r-band magnitude, verified with respect to the Sloan Digital Sky Survey (SDSS). RCS-2 reaches average 5 sigma point source limiting magnitudes of griz = [24.4, 24.3, 23.7, 22.8], approximately 1-2 magnitudes deeper than the SDSS. Due to the queue-scheduled nature of the observations, the data are highly uniform and taken in excellent seeing, mostly FWHM<~0.7" in the r-band. In addition to the main science goals just described, these data form the basis for a number of other planned and ongoing projects (including the WiggleZ survey), making RCS-2 an important next-generation imaging survey. [abridged]

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。

↑