Detection of the baryon acoustic peak in the large-scale correlation function of SDSS luminous red galaxies
Detection of the baryon acoustic peak in the large-scale correlation function of SDSS luminous red galaxies
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DOI：
10.1086/466512
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发表时间：
2005-11-10
影响因子：
4.9
通讯作者：
York, DG
中科院分区：
文献类型：
--
作者：
Eisenstein, DJ;Zehavi, I;York, DG
我们展示了从斯隆数字巡天的 46,748 个发光红色星系的光谱样本中测量得到的大尺度相关函数。调查区域覆盖3816 deg(2)以上0.72 h(-3) Gpc(3)，0.16 < z < 0.47，使其成为迄今为止研究大尺度结构的最佳样本。我们在 100 h(-1) Mpc 分离处的相关函数中发现了一个很好检测到的峰值，这与低红移物质聚类上重组历元声波振荡印记的预测形状和位置非常匹配。这次探测证明了在 z 值接近 1000 和现在之间由于引力不稳定性而导致结构的线性增长，并证实了标准宇宙学理论的可靠预测。声学峰值提供了一个标准标尺，通过它我们可以测量到 z = 0.35 和 z = 1089 的距离之比达到 4% 的小数精度，以及到 z 0:35 的绝对距离到 5% 的精度。从相关函数的整体形状来看，我们测量了物质密度 Omega(m)h(2) 为 8%，并发现与宇宙微波背景 (CMB) 各向异性的值一致。独立于 CMB 声学尺度提供的约束，我们发现 Omega(m) = 0.273 +/- 0.025 + 0.123(1 + w(0)) + 0.137 Omega(K)。包括CMB声学尺度，我们发现如果暗能量是宇宙学常数，则空间曲率为Omega(K) = -0.010 +/- 0.009。更一般地说，我们的结果提供了宇宙距离的测量，因此基于与微波背景各向异性具有相同简单物理原理的几何方法，为暗能量提供了论据。标准宇宙学模型令人信服地通过了对其基本属性的这些新的、稳健的测试。
We present the large-scale correlation function measured from a spectroscopic sample of 46,748 luminous red galaxies from the Sloan Digital Sky Survey. The survey region covers 0.72 h(-3) Gpc(3) over 3816 deg(2) and 0.16 < z < 0.47, making it the best sample yet for the study of large-scale structure. We find a well-detected peak in the correlation function at 100 h(-1) Mpc separation that is an excellent match to the predicted shape and location of the imprint of the recombination-epoch acoustic oscillations on the low-redshift clustering of matter. This detection demonstrates the linear growth of structure by gravitational instability between z approximate to 1000 and the present and confirms a firm prediction of the standard cosmological theory. The acoustic peak provides a standard ruler by which we can measure the ratio of the distances to z = 0.35 and z = 1089 to 4% fractional accuracy and the absolute distance to z 0: 35 to 5% accuracy. From the overall shape of the correlation function, we measure the matter density Omega(m)h(2) to 8% and find agreement with the value from cosmic microwave background (CMB) anisotropies. Independent of the constraints provided by the CMB acoustic scale, we find Omega(m) = 0.273 +/- 0.025 + 0.123(1 + w(0)) + 0.137 Omega(K). Including the CMB acoustic scale, we find that the spatial curvature is Omega(K) = -0.010 +/- 0.009 if the dark energy is a cosmological constant. More generally, our results provide a measurement of cosmological distance, and hence an argument for dark energy, based on a geometric method with the same simple physics as the microwave background anisotropies. The standard cosmological model convincingly passes these new and robust tests of its fundamental properties.