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Tests of the Las Campanas Distant Cluster Survey from Confirmation Observations for the ESO Distant Cluster Survey

机译:从ESO远程聚类调查的确认观察中对Las Campanas远程聚类调查的测试

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摘要

The ESO Distant Cluster Survey (EDisCS) is a photometric and spectroscopic study of the galaxy cluster population at two epochs, z~0.5 and z~0.8, drawn from the Las Campanas Distant Cluster Survey (LCDCS). We report results from the initial candidate confirmation stage of the program and use these results to probe the properties of the LCDCS. Of the 30 candidates targeted, we find statistically significant overdensities of red galaxies near 28. Of the ten additional candidates serendipitously observed within the fields of the targeted 30, we detect red galaxy overdensities near six. We test the robustness of the published LCDCS estimated redshifts to misidentification of the brighest cluster galaxy (BCG) in the survey data, and measure the spatial alignment of the published cluster coordinates, the peak red galaxy overdensity, and the brightest cluster galaxy. We conclude that for LCDCS clusters out to z~0.8, 1) the LCDCS coordinates agree with the centroid of the red galaxy overdensity to within 25'' (~150 h^{-1} kpc) for 34 out of 37 candidates with 3\sigma galaxy overdensities, 2) BCGs are typically coincident with the centroid of the red galaxy population to within a projected separation of 200 h^{-1} kpc (32 out of 34 confirmed candidates), 3) the red galaxy population is strongly concentrated, and 4) the misidentification of the BCG in the LCDCS causes a redshift error >0.1 in 15-20% of the LCDCS candidates. These findings together help explain the success of the surface brightness fluctuations detection method.
机译:ESO遥远星团调查(EDisCS)是对两个时期(z〜0.5和z〜0.8)的星系星团人口进行的光度学和光谱学研究,该数据来自拉斯坎帕纳斯星群调查(LCDCS)。我们报告程序初始候选阶段的结果,并使用这些结果来探究LCDCS的属性。在目标的30个候选者中,我们发现了28个附近的红色星系的统计显着密度。在目标30个领域内偶然发现的另外十个候选者中,我们在六个附近发现了红色星系的密度。我们在调查数据中测试了已发布的LCDCS估计的红移到最亮星团星系(BCG)错误识别的鲁棒性,并测量了已发布星团坐标,红色星系峰值密度和最亮星团星系的空间排列。我们得出结论,对于LCDCS群集到z〜0.8,1)对于37个候选对象中的34个,LCDCS坐标与红色星系密度的质心在25''(〜150 h ^ {-1} kpc)之内一致\ sigma星系密度,2)BCG通常与红色星系种群的质心重合,预计间隔为200 h ^ {-1} kpc(34个已确认候选者中的32个),3)红色星系种群强烈4)LCDCS中BCG的错误识别会导致15-20%的LCDCS候选对象的红移误差> 0.1。这些发现共同帮助说明了表面亮度波动检测方法的成功。

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