利用暗能量巡天中的Ia型超新星得到首批宇宙学结果：分析、系统不确定度与验证
宇宙学与河外天体物理
2019-06-04 v5
摘要
我们展示了支撑来自暗能量巡天超新星计划(DES-SN)前三年207颗经光谱分类的Ia型超新星(SNe Ia)的宇宙学参数测量的分析，其红移范围为0.017<<0.849。我们将DES-SN样本与122颗低红移(<0.1) SNe Ia的外部样本结合，得到“DES-SN3YR”的329颗SNe Ia样本。我们的宇宙学分析是盲法的：在将DES-SN3YR距离与来自宇宙微波背景(CMB; Planck Collaboration 2016)的限制结合后，我们对暗能量状态方程参数测量的不确定度在68%置信度下为0.042(统计)和0.059(统计+系统)。我们提供了详细的系统不确定度预算，其在测光定标、天体物理偏差修正和仪器偏差修正方面贡献几乎相等。我们也包含了若干新的系统不确定度来源。虽然我们的样本规模小于Pantheon样本的三分之一，但我们对的限制仅大了1.4，显示了DES SN Ia光变曲线质量的影响。我们发现DES SNe Ia的传统拉伸和颜色标准化参数与早期SN Ia样本（如Pan-STARRS1和超新星遗留巡天）一致。然而，我们发现哈勃图周围的内禀弥散更小(0.077 mag)。有趣的是，对于DES子集，我们发现作为宿主星系质量函数的哈勃残差步长无证据(0.007 0.018 mag)，与先前测量存在2.4张力。我们也提出了使用插入DECam图像中的模拟SNe Ia以及使用大型星表级模拟来检验我们分析流水线偏差的新颖验证方法。
引用
@article{arxiv.1811.02377,
title = {First Cosmology Results Using Type Ia Supernovae From the Dark Energy Survey: Analysis, Systematic Uncertainties, and Validation},
author = {D. Brout and D. Scolnic and R. Kessler and C. B. D'Andrea and T. M. Davis and R. R. Gupta and S. R. Hinton and A. G. Kim and J. Lasker and C. Lidman and E. Macaulay and A. Möller and R. C. Nichol and M. Sako and M. Smith and M. Sullivan and B. Zhang and P. Andersen and J. Asorey and A. Avelino and B. A. Bassett and P. Brown and J. Calcino and D. Carollo and P. Challis and M. Childress and A. Clocchiatti and A. V. Filippenko and R. J. Foley and L. Galbany and K. Glazebrook and J. K. Hoormann and E. Kasai and R. P. Kirshner and K. Kuehn and S. Kuhlmann and G. F. Lewis and K. S. Mandel and M. March and V. Miranda and E. Morganson and D. Muthukrishna and P. Nugent and A. Palmese and Y. -C. Pan and R. Sharp and N. E. Sommer and E. Swann and R. C. Thomas and B. E. Tucker and S. A. Uddin and W. Wester and T. M. C. Abbott and S. Allam and J. Annis and S. Avila and K. Bechtol and G. M. Bernstein and E. Bertin and D. Brooks and D. L. Burke and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and F. J. Castander and C. E. Cunha and L. N. da Costa and C. Davis and J. De Vicente and D. L. DePoy and S. Desai and H. T. Diehl and P. Doel and A. Drlica-Wagner and T. F. Eifler and J. Estrada and E. Fernandez and B. Flaugher and P. Fosalba and J. Frieman and J. García-Bellido and D. Gruen and R. A. Gruendl and G. Gutierrez and W. G. Hartley and D. L. Hollowood and K. Honscheid and B. Hoyle and D. J. James and M. Jarvis and T. Jeltema and E. Krause and O. Lahav and T. S. Li and M. Lima and M. A. G. Maia and J. Marriner and J. L. Marshall and P. Martini and F. Menanteau and C. J. Miller and R. Miquel and R. L. C. Ogando and A. A. Plazas and A. K. Romer and A. Roodman and E. S. Rykoff and E. Sanchez and B. Santiago and V. Scarpine and M. Schubnell and S. Serrano and I. Sevilla-Noarbe 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 M. A. Troxel and D. L. Tucker and V. Vikram and A. R. Walker and Y. Zhang},
journal= {arXiv preprint arXiv:1811.02377},
year = {2019}
}
备注
30 Pages, 18 Figures, 12 Tables. Submitted to ApJ. Comments welcome