Photometric redshifts: estimating their contamination and distribution using clustering information
Photometric redshifts: estimating their contamination and distribution using clustering information
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DOI：
10.1111/j.1365-2966.2010.17191.x
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发表时间：
2010-02
影响因子：
4.8
通讯作者：
J. Benjamin;L. Waerbeke;B. M'enard;M. Kilbinger
中科院分区：
文献类型：
--
作者：
J. Benjamin;L. Waerbeke;B. M'enard;M. Kilbinger
我们提出了一种新的技术来估计光度红移箱之间的污染水平。如果红移仓之间的真实角互相关可以安全地假设为零，则任何测量到的互相关都是仓之间污染的结果。我们提出的理论为任意数量的红移箱，并详细讨论的情况下，两个和三个箱，可以很容易地解决分析。我们使用模拟目录构建的千年模拟测试的方法，表明人工污染，可以成功地恢复与我们的方法。我们发现，退化的参数空间中禁止我们确定一个独特的解决方案的污染，虽然限制，可以改善较大的数据集。然后，我们将该方法应用于观测星系调查：深组成部分的加拿大-法国-夏威夷望远镜遗产调查。我们估计光度红移箱之间的污染水平，并证明我们有能力重建的真实红移分布和真实的平均红移星系在每个光度箱。
We present a new technique to estimate the level of contamination between photometric redshift bins. If the true angular cross-correlation between redshift bins can be safely assumed to be zero, any measured cross-correlation is a result of contamination between the bins. We present the theory for an arbitrary number of redshift bins, and discuss in detail the case of two and three bins which can be easily solved analytically. We use mock catalogues constructed from the Millennium Simulation to test the method, showing that artificial contamination can be successfully recovered with our method. We find that degeneracies in the parameter space prohibit us from determining a unique solution for the contamination, though constraints are made which can be improved with larger data sets. We then apply the method to an observational galaxy survey: the deep component of the Canada-France-Hawaii Telescope Legacy Survey. We estimate the level of contamination between photometric redshift bins and demonstrate our ability to reconstruct both the true redshift distribution and the true average redshift of galaxies in each photometric bin.