来自 42 颗高红移超新星的 Omega 与 Lambda 测量
天体物理学
2008-11-26 v1 高能物理 - 实验
高能物理 - 唯象学
摘要
我们报告了基于42颗Type Ia超新星（由Supernova Cosmology Project发现）测得的质量密度Omega_M和宇宙常数能量密度Omega_Lambda。这些超新星的红移范围为0.18至0.83，其光度-红移数据联合分析低红移Calan/Tololo超新星测量（红移<0.1），并通过SN Ia光度曲线宽度-亮度关系标准化。测得结果显示：0.8Omega_M - 0.6Omega_Lambda ≈ -0.2 ± 0.1（Omega_M < 1.5）。在平坦宇宙模型下Omega_M = 0.28{+0.09,-0.08}（统计误差）{+0.05,-0.04}（系统误差）。数据与Lambda=0平坦宇宙模型显著不符，开放式Lambda=0模型亦不拟合：数据表明宇宙常数为正且显著，P(Lambda>0)=99%。平坦宇宙下宇宙年龄t_0 = 14.9{+1.4,-1.1} (0.63/h) Gyr。样本规模允许多项统计检验，无显著差异发现于低红移Calan/Tololo样本与高红移样本间的宿主 reddening分布及Malmquist偏差。无论是否采用宽度-亮度关系，结论均稳健。
引用
@article{arxiv.astro-ph/9812133,
title = {Measurements of Omega and Lambda from 42 High-Redshift Supernovae},
author = {S. Perlmutter and G. Aldering and G. Goldhaber and R. A. Knop and P. Nugent and P. G. Castro and S. Deustua and S. Fabbro and A. Goobar and D. E. Groom and I. M. Hook and A. G. Kim and M. Y. Kim and J. C. Lee and N. J. Nunes and R. Pain and C. R. Pennypacker and R. Quimby and C. Lidman and R. S. Ellis and M. Irwin and R. G. McMahon and P. Ruiz-Lapuente and N. Walton and B. Schaefer and B. J. Boyle and A. V. Filippenko and T. Matheson and A. S. Fruchter and N. Panagia and H. J. M. Newberg and W. J. Couch},
journal= {arXiv preprint arXiv:astro-ph/9812133},
year = {2008}
}
备注
21 pages and 10 figures. Accepted for publication in the Astrophysical Journal. Individual color figures, supplementary tables, and preprint also available at http://www-supernova.lbl.gov/