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arXiv 1102.5743astro-ph.COastro-ph.IM
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用红移巡天检验弱透镜映射:Subaru场

Testing Weak Lensing Maps With Redshift Surveys: A Subaru Field

Michael J. Kurtz, Margaret J. Geller, Yousuke Utsumi, Satoshi Miyazaki, Ian P. Dell'Antonio, Daniel G. Fabricant

摘要:

我们在斯巴鲁GTO 2deg^2弱透镜场(中心在$α_{2000}$ = 16 $^h04^m44^s$ ; $δ_{2000}$ =43^ \circ 11^{ \prime }24^{\prime \prime }$)的前景使用密集红移测量来评估弱透镜图中大质量晕识别的完整性并对其纯度进行评论。红移巡天(在这里发表)包括4541个星系; 4405个是用MMT上的Hectospec测量的新红移。在信噪比大于4.25的弱透镜峰中,2/3对应于单个大质量系统;这一结果与Geller等人(2010)对深透镜巡天F2场的测试基本相同。斯巴鲁地图,基于图像在实质上更好地看到比DLS,使检测质量较低的晕在固定的红移预期。我们证明了Miyazaki等人(2007)采用的从弱透镜图中去除一些污染峰的方法提高了透镜图和红移测量在识别候选大质量系统中的一致性。

英文摘要:

We use a dense redshift survey in the foreground of the Subaru GTO2deg^2 weak lensing field (centered at $α_{2000}$ = 16$^h04^m44^s$;$δ_{2000}$ =43^\circ11^{\prime}24^{\prime\prime}$) to assess the completeness and comment on the purity of massive halo identification in the weak lensing map. The redshift survey (published here) includes 4541 galaxies; 4405 are new redshifts measured with the Hectospec on the MMT. Among the weak lensing peaks with a signal-to-noise greater that 4.25, 2/3 correspond to individual massive systems; this result is essentially identical to the Geller et al. (2010) test of the Deep Lens Survey field F2. The Subaru map, based on images in substantially better seeing than the DLS, enables detection of less massive halos at fixed redshift as expected. We demonstrate that the procedure adopted by Miyazaki et al. (2007) for removing some contaminated peaks from the weak lensing map improves agreement between the lensing map and the redshift survey in the identification of candidate massive systems.

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