The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the Data Release 9 spectroscopic galaxy sample
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the Data Release 9 spectroscopic galaxy sample
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DOI：
10.1111/j.1365-2966.2012.22066.x
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发表时间：
2012-12-01
影响因子：
4.8
通讯作者：
Zhao, Gong-Bo
中科院分区：
文献类型：
--
作者：
Anderson, Lauren;Aubourg, Eric;Zhao, Gong-Bo
我们介绍了来自重子振荡光谱调查(BOSS)的星系团的测量结果，该调查是斯隆数字天空调查III(SDSS-III)的一部分。这些数据使用的是数据发布9(DR9)CMASS样本，其中包含264个283个大质量星系，覆盖3275平方度，有效红移z=0.57，红移范围0.43<；z<；0.7。假设一个协调的Lambda CDM宇宙学模型，这个样本覆盖了2.2GPC(3)的有效体积，并代表了在这个密度下所观测到的宇宙中最大的样本，(N)在大巴上接近3×10(-4)h(-3)MPC(3)。我们测量了角平均星系的关联函数和功率谱，包括重子声振荡(BaO)特征的密度场重建。在相关函数和功率谱上均能检测到5西格玛显著的声学特征。结合SDSS-II发光红星系样本，其探测意义提高到6.7西格玛。对声学特征位置的拟合测得z=0.57时相对于声界的距离D-V/r(S)=13.67+/0.22。假设基准声视界为153.19 mpc，与宇宙微波背景约束相匹配，这对应于距离D-V(z=0.57)=2094+/-34mpc。这是从银河系调查中获得的最精确的距离限制，为1.7%。我们将这一结果与之前的BaO测量放在一个宇宙距离阶梯中，并发现与目前的超新星测量非常一致。我们使用这些距离测量来约束各种宇宙学模型，找到对具有宇宙学常数的平坦宇宙的持续支持。
We present measurements of galaxy clustering from the Baryon Oscillation Spectroscopic Survey (BOSS), which is part of the Sloan Digital Sky Survey III (SDSS-III). These use the Data Release 9 (DR9) CMASS sample, which contains 264 283 massive galaxies covering 3275 square degrees with an effective redshift z = 0.57 and redshift range 0.43 < z < 0.7. Assuming a concordance Lambda CDM cosmological model, this sample covers an effective volume of 2.2 Gpc(3), and represents the largest sample of the Universe ever surveyed at this density, (n) over bar approximate to 3 x 10(-4) h(-3) Mpc(3). We measure the angle-averaged galaxy correlation function and power spectrum, including density-field reconstruction of the baryon acoustic oscillation (BAO) feature. The acoustic features are detected at a significance of 5 sigma in both the correlation function and power spectrum. Combining with the SDSS-II luminous red galaxy sample, the detection significance increases to 6.7 sigma. Fitting for the position of the acoustic features measures the distance to z = 0.57 relative to the sound horizon D-V/r(s) = 13.67 +/ 0.22 at z = 0.57. Assuming a fiducial sound horizon of 153.19 Mpc, which matches cosmic microwave background constraints, this corresponds to a distance D-V (z = 0.57) = 2094 +/- 34 Mpc. At 1.7 per cent, this is the most precise distance constraint ever obtained from a galaxy survey. We place this result alongside previous BAO measurements in a cosmological distance ladder and find excellent agreement with the current supernova measurements. We use these distance measurements to constrain various cosmological models, finding continuing support for a flat Universe with a cosmological constant.