暗能量巡天第一年结果：弱透镜源星系的红移分布
宇宙学与河外天体物理
2018-05-15 v2
摘要
我们描述了暗能量巡天（DES）第一年宇宙学分析中用作弱透镜源的星系的红移分布估计及其不确定性的推导与验证。使用贝叶斯测光红移（BPZ）代码将星系分配到z=0.2至1.3之间的四个红移区间，并为区间i生成透镜加权红移分布nⁱ_PZ(z)的初始估计。宇宙学参数的精确确定关键依赖于对nⁱ的了解，但对单个星系的区间分配或红移误差不敏感。宇宙学分析允许通过平移nⁱ(z)=nⁱ_PZ(z-Δzⁱ)来修正nⁱ(z)的平均红移，以校正nⁱ_PZ中的偏差。Δzⁱ通过比较COSMOS场中星系独立估计的30波段测光红移与根据DES griz流量做出的BPZ估计来约束，该比较基于一个在流量、预视宁度尺寸和透镜权重上与DES弱透镜源匹配的样本。在配套论文中，Δzⁱ进一步受到源星系围绕具有可靠测光红移（0.15<z<0.9）的红色星系的角成团性约束。本文详述了BPZ和COSMOS流程，并证明宇宙学推断对nⁱ(z)的细节不敏感，仅取决于Δzⁱ的选择。成团性和COSMOS验证方法产生了一致的Δzⁱ估计，四个区间中的综合不确定性分别为σ_{Δzⁱ}=0.015, 0.013, 0.011和0.022。我们在所有后续分析中边缘化这些不确定性，这并未显著削弱约束能力。使用方向邻域拟合（DNF）算法代替BPZ重复测光红移流程，或使用直接由COSMOS估计的nⁱ(z)，在宇宙学推断中未产生可辨别的差异。
引用
@article{arxiv.1708.01532,
title = {Dark Energy Survey Year 1 Results: Redshift distributions of the weak lensing source galaxies},
author = {B. Hoyle and D. Gruen and G. M. Bernstein and M. M. Rau and J. De Vicente and W. G. Hartley and E. Gaztanaga and J. DeRose and M. A. Troxel and C. Davis and A. Alarcon and N. MacCrann and J. Prat and C. Sánchez and E. Sheldon and R. H. Wechsler and J. Asorey and M. R. Becker and C. Bonnett and A. Carnero Rosell and D. Carollo and M. Carrasco Kind and F. J. Castander and R. Cawthon and C. Chang and M. Childress and T. M. Davis and A. Drlica-Wagner and M. Gatti and K. Glazebrook and J. Gschwend and S. R. Hinton and J. K. Hoormann and A. G. Kim and A. King and K. Kuehn and G. Lewis and C. Lidman and H. Lin and E. Macaulay and M. A. G. Maia and P. Martini and D. Mudd and A. Möller and R. C. Nichol and R. L. C. Ogando and R. P. Rollins and A. Roodman and A. J. Ross and E. Rozo and E. S. Rykoff and S. Samuroff and I. Sevilla-Noarbe and R. Sharp and N. E. Sommer and B. E. Tucker and S. A. Uddin and T. N. Varga and P. Vielzeuf and F. Yuan and B. Zhang and T. M. C. Abbott and F. B. Abdalla and S. Allam and J. Annis and K. Bechtol and A. Benoit-Lévy and E. Bertin and D. Brooks and E. Buckley-Geer and D. L. Burke and M. T. Busha and D. Capozzi and J. Carretero and M. Crocce and C. B. D'Andrea and L. N. da Costa and D. L. DePoy and S. Desai and H. T. Diehl and P. Doel and T. F. Eifler and J. Estrada and A. E. Evrard and E. Fernandez and B. Flaugher and P. Fosalba and J. Frieman and J. García-Bellido and D. W. Gerdes and T. Giannantonio and D. A. Goldstein and R. A. Gruendl and G. Gutierrez and K. Honscheid and D. J. James and M. Jarvis and T. Jeltema and M. W. G. Johnson and M. D. Johnson and D. Kirk and E. Krause and S. Kuhlmann and N. Kuropatkin and O. Lahav and T. S. Li and M. Lima and M. March and J. L. Marshall and P. Melchior and F. Menanteau and R. Miquel and B. Nord and C. R. O'Neill and A. A. Plazas and A. K. Romer and M. Sako and E. Sanchez and B. Santiago and V. Scarpine and R. Schindler and M. Schubnell 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 D. L. Tucker and V. Vikram and A. R. Walker and J. Weller and W. Wester and R. C. Wolf and B. Yanny and J. Zuntz},
journal= {arXiv preprint arXiv:1708.01532},
year = {2018}
}
备注
MNRAS accepted; 20 pages, 8 figures