用Voronoi镶嵌探测红移分布的稀疏尾
Probing the sparse tails of redshift distributions with Voronoi tessellations
摘要：
我们介绍了一种算法来估计红移分布的样本的星系光度选定的子样本测量光谱红移。该方法使用非参数Voronoi镶嵌密度估计插值的星系分布的红移和光度的颜色空间。我们在一个已知颜色红移分布的模拟数据集上测试了该方法。我们发现，Voronoi镶嵌估计在重建个别星系的红移分布的尾部表现良好，并给出了无偏估计的第一和第二时刻。源代码可在http://bitbucket.org/bengranett/tailz上公开获得。
英文摘要：
We introduce an algorithm to estimate the redshift distribution of a sample of galaxies selected photometrically given a subsample with measured spectroscopic redshifts. The approach uses a non-parametric Voronoi tessellation density estimator to interpolate the galaxy distribution in the redshift and photometric color space. We test the method on a mock dataset with a known color-redshift distribution. We find that the Voronoi tessellation estimator performs well at reconstructing the tails of the redshift distribution of individual galaxies and gives unbiased estimates of the first and second moments. The source code is publicly available at http://bitbucket.org/bengranett/tailz.
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