暗能量巡天第一年结果：交叉相关红移——方法与系统误差表征
宇宙学与河外天体物理
2018-03-14 v1
摘要
我们利用数值模拟来表征一种基于星团的方法来校准光度红移偏差的性能。具体而言，我们将暗能量巡天第一年 (DES Y1) 样本中的弱引力透镜 (WL) 源星系与 redMaGiC 星系（具有可靠光度红移的亮红星系）进行交叉相关，以估计前一样本的红移分布。恢复的红移分布用于校准应用于相同源星系样本的标准 photo- 方法的光度红移偏差。我们将该方法应用于在模拟数据中运行的三种 photo- 代码：贝叶斯光度红移 (BPZ)、方向邻域拟合 (DNF) 和基于随机森林的 photo- (RF)。我们表征了校准过程的系统不确定性，发现这些系统不确定性主导了我们的误差预算。主要的系统误差源于我们假设每个红移 bin 内的偏差和星团不演化，以及源于由星团导出的红移分布形状与由 photo- 导出的形状之间的差异。源星系样本平均红移偏差的系统不确定性为 ，尽管精确值取决于所考虑的红移 bin。我们讨论了在未来分析中减轻主要系统误差影响的可能方法。
引用
@article{arxiv.1709.00992,
title = {Dark Energy Survey Year 1 Results: Cross-Correlation Redshifts - Methods and Systematics Characterization},
author = {M. Gatti and P. Vielzeuf and C. Davis and R. Cawthon and M. M. Rau and J. DeRose and J. De Vicente and A. Alarcon and E. Rozo and E. Gaztanaga and B. Hoyle and R. Miquel and G. M. Bernstein and C. Bonnett and A. Carnero Rosell and F. J. Castander and C. Chang and L. N. da Costa and D. Gruen and J. Gschwend and W. G. Hartley and H. Lin and N. MacCrann and M. A. G. Maia and R. L. C. Ogando and A. Roodman and I. Sevilla-Noarbe and M. A. Troxel and R. H. Wechsler and J. Asorey and T. M. Davis and K. Glazebrook and S. R. Hinton and G. Lewis and C. Lidman and E. Macaulay and A. Möller and C. R. O'Neill and N. E. Sommer and S. A. Uddin and F. Yuan and B. Zhang and T. M. C. Abbott and S. Allam and J. Annis and K. Bechtol and D. Brooks and D. L. Burke and D. Carollo and M. Carrasco Kind and J. Carretero and C. E. Cunha and C. B. D'Andrea and D. L. DePoy and S. Desai and T. F. Eifler and A. E. Evrard and B. Flaugher and P. Fosalba and J. Frieman and J. García-Bellido and D. W. Gerdes and D. A. Goldstein and R. A. Gruendl and G. Gutierrez and K. Honscheid and J. K. Hoormann and B. Jain and D. J. James and M. Jarvis and T. Jeltema and M. W. G. Johnson and M. D. Johnson and E. Krause and K. Kuehn and S. Kuhlmann and N. Kuropatkin and T. S. Li and M. Lima and J. L. Marshall and P. Melchior and F. Menanteau and R. C. Nichol and B. Nord and A. A. Plazas and K. Reil and E. S. Rykoff and M. Sako and E. Sanchez and V. Scarpine and M. Schubnell and E. Sheldon and M. Smith and R. C. Smith and M. Soares-Santos and F. Sobreira and E. Suchyta and M. E. C. Swanson and G. Tarle and D. Thomas and B. E. Tucker and D. L. Tucker and V. Vikram and A. R. Walker and J. Weller and W. Wester and R. C. Wolf},
journal= {arXiv preprint arXiv:1709.00992},
year = {2018}
}
备注
submitted to MNRAS