Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
Science. 2010 Aug 20;329(5994):924-7. doi: 10.1126/science.1185759.
Current efforts in observational cosmology are focused on characterizing the mass-energy content of the universe. We present results from a geometric test based on strong lensing in galaxy clusters. Based on Hubble Space Telescope images and extensive ground-based spectroscopic follow-up of the massive galaxy cluster Abell 1689, we used a parametric model to simultaneously constrain the cluster mass distribution and dark energy equation of state. Combining our cosmological constraints with those from x-ray clusters and the Wilkinson Microwave Anisotropy Probe 5-year data gives Omega(m) = 0.25 +/- 0.05 and w(x) = -0.97 +/- 0.07, which are consistent with results from other methods. Inclusion of our method with all other available techniques brings down the current 2sigma contours on the dark energy equation-of-state parameter w(x) by approximately 30%.
当前观测宇宙学的研究重点是描述宇宙的物质-能量含量。我们提出了基于星系团中强引力透镜的几何检验结果。基于哈勃太空望远镜的图像和对大质量星系团 Abell 1689 的广泛地面光谱学后续观测，我们使用参数模型同时约束了星系团的质量分布和暗能量状态方程。将我们的宇宙学约束与来自 X 射线星系团和威尔金森微波各向异性探测器 5 年数据的结果相结合，得到 Omega(m) = 0.25 +/- 0.05 和 w(x) = -0.97 +/- 0.07，这与其他方法的结果一致。将我们的方法与所有其他可用技术结合使用，可以将暗能量状态方程参数 w(x)的当前 2σ 轮廓降低约 30%。
