DES科学验证剪切星表中星系的红移分布及其对弱引力透镜的影响
宇宙学与河外天体物理
2016-09-07 v2
摘要
我们给出了暗能量巡天科学验证数据弱引力透镜分析中所用星系的光度红移估计。分析了四种基于模型或机器学习的光度红移方法——ANNz2、针对BCC-Ufig模拟校准的BPZ、SkyNet和TPZ。为训练、校准和测试这些方法，我们构建了一个与DES SV数据匹配的光谱证认星系星表。针对匹配的光谱星表评估了这些方法的性能，重点关注与弱引力透镜分析相关的指标，并利用COSMOS photo-z进行了额外验证。从DES SV剪切星表中的星系（其平均红移在0.3<z<1.3范围内为）出发，我们构建了三个层析红移区间，其平均值分别为。这些区间在基准SkyNet photo-z 的平均值中均具有的系统不确定性。我们将红移分布的误差传播至其对宇宙剪切估计的宇宙学参数的影响，发现它们导致的值偏移约3%。这一偏移在DES SV剪切星表的一个sigma统计误差范围内。我们进一步研究了系统差异对临界面密度的潜在影响，发现偏差水平安全地低于DES SV数据的统计能力。我们建议对三个层析区间中每一个的平均值中的photo-z偏差采用宽度为0.05的最终高斯先验，并证明这对于相应的宇宙学分析是一个充分的偏差模型。
引用
@article{arxiv.1507.05909,
title = {Redshift distributions of galaxies in the DES Science Verification shear catalogue and implications for weak lensing},
author = {C. Bonnett and M. A. Troxel and W. Hartley and A. Amara and B. Leistedt and M. R. Becker and G. M. Bernstein and S. Bridle and C. Bruderer and M. T. Busha and M. Carrasco Kind and M. J. Childress and F. J. Castander and C. Chang and M. Crocce and T. M. Davis and T. F. Eifler and J. Frieman and C. Gangkofner and E. Gaztanaga and K. Glazebrook and D. Gruen and T. Kacprzak and A. King and J. Kwan and O. Lahav and G. Lewis and C. Lidman and H. Lin and N. MacCrann and R. Miquel and C. R. O'Neill and A. Palmese and H. V. Peiris and A. Refregier and E. Rozo and E. S. Rykoff and I. Sadeh and C. Sánchez and E. Sheldon and S. Uddin and R. H. Wechsler and J. Zuntz and T. Abbott and F. B. Abdalla and S. Allam and R. Armstrong and M. Banerji and A. H. Bauer and A. Benoit-Lévy and E. Bertin and D. Brooks and E. Buckley-Geer and D. L. Burke and D. Capozzi and A. Carnero Rosell and J. Carretero and C. E. Cunha and C. B. D'Andrea and L. N. da Costa and D. L. DePoy and S. Desai and H. T. Diehl and J. P. Dietrich and P. Doel and A. Fausti Neto and E. Fernandez and B. Flaugher and P. Fosalba and D. W. Gerdes and R. A. Gruendl and K. Honscheid and B. Jain and D. J. James and M. Jarvis and A. G. Kim and K. Kuehn and N. Kuropatkin and T. S. Li and M. Lima and M. A. G. Maia and M. March and J. L. Marshall and P. Martini and P. Melchior and C. J. Miller and E. Neilsen and R. C. Nichol and B. Nord and R. Ogando and A. A. Plazas and K. Reil and A. K. Romer and A. Roodman and M. Sako and E. Sanchez and B. Santiago and R. C. Smith and M. Soares-Santos and F. Sobreira and E. Suchyta and M. E. C. Swanson and G. Tarle and J. Thaler and D. Thomas and V. Vikram and A. R. Walker},
journal= {arXiv preprint arXiv:1507.05909},
year = {2016}
}
备注
high-resolution versions of figures can be downloaded from http://deswl.github.io