GaBoDS: the Garching-Bonn Deep Survey. IX. A sample of 158 shear-selected mass concentration candidates
GaBoDS: the Garching-Bonn Deep Survey. IX. A sample of 158 shear-selected mass concentration candidates
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DOI：
10.1051/0004-6361:20065955
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发表时间：
2006-07
影响因子：
6.5
通讯作者：
M. Schirmer;T. Erben;M. Hetterscheidt;Peter Schneider Isaac Newton Group of Telescopes;L. Palma;Spain.;Argelander Institut fuer Astronomie;U. Bonn;H Germany
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文献类型：
--
作者：
M. Schirmer;T. Erben;M. Hetterscheidt;Peter Schneider Isaac Newton Group of Telescopes;L. Palma;Spain.;Argelander Institut fuer Astronomie;U. Bonn;H Germany
目标。本工作的目的是基于弱引力透镜方法构建一个质量选择的星系团样本。将对该样品进行光谱跟踪观测。引力透镜方法我们应用质量孔径统计（S-统计）和它的一个新的衍生物（P-统计），以19平方度的高质量，单色宽视场成像数据与WFI@MPG/ESO 2.2米望远镜。对于统计的过滤器功能的家庭使用，近似预期的切向径向剪切分布，从而允许质量浓度的有效检测。P-统计量的准确性能仍然需要通过模拟来评估。大量结果。我们发现用P-和S-统计量得到的质量浓度的两个样本具有非常相似的性质。它们之间的重叠随着所进行的检测的S/N而增加。总的来说，我们提出了一个158种可能的质量浓度的组合列表，这是第一次公布如此大的盲目选择的样本。其中72个发现与明亮星系的聚集有关。对于其中的22个，我们在文献中发现了光谱，表明或证明所看到的星系确实是空间集中的。其中16个以前被认为是集群，或同时被作为集群保护。我们目前跟踪了大量的光谱，以更深入地了解它们的物理性质。其余55%的可能质量浓度与任何可见光无关。我们发现，这些“黑暗”的检测主要是由于噪声，并优先出现在浅的数据。
Aims. The aim of the present work is the construction of a mass-selected galaxy cluster sample based on weak gravitational lensing methods. This sample will be subject to spectroscopic follow-up observations. gravitational lensing Methods. We apply the mass aperture statistics (S-statistics) and a new derivative of it (the P-statistics) to 19 square degrees of high quality, single colour wide field imaging data obtained with the WFI@MPG/ESO 2.2 m telescope. For the statistics a family of filter functions is used that approximates the expected tangential radial shear profile and thus allows for the efficient detection of mass concentrations. The exact performance of the P-statistics still needs to be evaluated by means of simulations. of mass Results. We find that the two samples of mass concentrations found with the P- and S-statistics have very similar properties. The overlap between them increases with the S/N of the detections made. In total, we present a combined list of 158 possible mass concentrations, which is the first time that such a large and blindly selected sample is published. 72 of the detections are associated with concentrations of bright galaxies. For about 22 of those we found spectra in the literature, indicating or proving that the galaxies seen are indeed spatially concentrated. 16 of those were previously known to be clusters or have meanwhile been secured as such. We currently follow-up a larger number of them spectroscopically to obtain deeper insight into their physical properties. The remaining 55% of the possible mass concentrations found are not associated with any optical light. We show that those "dark" detections are mostly due to noise, and appear preferentially in shallow data.