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arXiv 1006.0610astro-ph.CO
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寻找星系团的光学和弱透镜数据的最佳滤波:应用于COSMOS领域

Optimal filtering of optical and weak lensing data to search for galaxy clusters: application to the COSMOS field

Fabio Bellagamba, Matteo Maturi, Takashi Hamana, Massimo Meneghetti, Satoshi Miyazaki, Lauro Moscardini

摘要:

星系团通常是通过适当的滤波方法在盲视光学巡天中探测到的。我们提出了一个最佳匹配滤波器,最大限度地提高他们的信噪比,利用知识,我们有他们的内在物理特性和数据噪声特性。在本文中,我们限制我们的应用星系的星等,位置和光度红移,如果可用的话,我们也适用于过滤器单独弱透镜数据。该方法适合于自然地扩展到多波段方法,该方法不仅可以包括附加的光学波段,还可以包括具有不同性质的可观测量,例如X射线。对于每次检测,即使没有给出photo-z,滤波器也会提供其重要性、丰度和红移的估计。所提供的分析误差估计进行了测试,对数值模拟。最后,我们将我们的方法应用到COSMOS领域,并将结果与以前的集群检测得到不同的方法。我们的星表包含27个星系团,最小阈值在3-sigma水平,包括光学和弱透镜信息。

英文摘要:

Galaxy clusters are usually detected in blind optical surveys via suitable filtering methods. We present an optimal matched filter which maximizes their signal-to-noise ratio by taking advantage of the knowledge we have of their intrinsic physical properties and of the data noise properties. In this paper we restrict our application to galaxy magnitudes, positions and photometric redshifts if available, and we also apply the filter separately to weak lensing data. The method is suitable to be naturally extended to a multi-band approach which could include not only additional optical bands but also observables with different nature such as X-rays. For each detection, the filter provides its significance, an estimate for the richness and for the redshift even if photo-z are not given. The provided analytical error estimate is tested against numerical simulations. We finally apply our method to the COSMOS field and compare the results with previous cluster detections obtained with different methods. Our catalogue contains 27 galaxy clusters with minimal threshold at 3-sigma level including both optical and weak-lensing information.

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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