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arXiv 1203.6594astro-ph.CO
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SDSS-III重子振荡光谱巡天中的星系成团:9号数据发布光谱星系样本中的重子声学振荡

The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 9 Spectroscopic Galaxy Sample

Lauren Anderson, Eric Aubourg, Stephen Bailey, Dmitry Bizyaev, Michael Blanton, Adam S. Bolton, J. Brinkmann, Joel R. Brownstein, Angela Burden, Antonio J. Cues… 展开作者

Lauren Anderson, Eric Aubourg, Stephen Bailey, Dmitry Bizyaev, Michael Blanton, Adam S. Bolton, J. Brinkmann, Joel R. Brownstein, Angela Burden, Antonio J. Cuesta, Luiz N. A. da Costa, Kyle S. Dawson, Roland de Putter, Daniel J. Eisenstein, James E. Gunn, Hong Guo, Jean-Christophe Hamilton, Paul Harding, Shirley Ho, Klaus Honscheid, Eyal Kazin, D. Kirkby, Jean-Paul Kneib, Antione Labatie, Craig Loomis, Robert H. Lupton, Elena Malanushenko, Viktor Malanushenko, Rachel Mandelbaum, Marc Manera, Claudia Maraston, Cameron K. McBride, Kushal T. Mehta, Olga Mena, Francesco Montesano, Demetri Muna, Robert C. Nichol, Sebastian E. Nuza, Matthew D. Olmstead, Daniel Oravetz, Nikhil Padmanabhan, Nathalie Palanque-Delabrouille, Kaike Pan, John Parejko, Isabelle Paris, Will J. Percival, Patrick Petitjean, Francisco Prada, Beth Reid, Natalie A. Roe, Ashley J. Ross, Nicholas P. Ross, Lado Samushia, Ariel G. Sanchez, David J. Schlegel Donald P. Schneider, Claudia G. Scoccola, Hee-Jong Seo, Erin S. Sheldon, Audrey Simmons, Ramin A. Skibba, Michael A. Strauss, Molly E. C. Swanson, Daniel Thomas, Jeremy L. Tinker, Rita Tojeiro, Mariana Vargas Magana, Licia Verde, Christian Wagner, David A. Wake, Benjamin A. Weaver, David H. Weinberg, Martin White, Xiaoying Xu, Christophe Yeche, Idit Zehavi, Gong-Bo Zhao

摘要:

我们目前的测量星系集群的重子振荡光谱调查(BOSS),这是斯隆数字巡天III(SDSS-III)的一部分。它们使用了Data Release 9(DR 9)CMASS样本,其中包含264,283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。假设是一个和谐的λ-CDM宇宙学模型,这个样本覆盖的有效体积为2.2 Gpc ^3,代表了在这个密度n = 3 x 10^-4 h^-3 Mpc ^3下观测到的最大的宇宙样本。我们测量了角平均星系关联函数和功率谱,包括密度场重建的重子声学振荡(BAO)特征。在关联函数和功率谱中检测到5σ显著性的声学特征。结合SDSS-Ⅱ亮红星系样本,探测显著性提高到6.7σ。对声学特征的位置的拟合测量到z=0.57相对于z=0.57处的声音水平线DV /rs = 13.67 +/-0.22的距离。假设基准声音视界为153.19 Mpc,与宇宙微波背景约束相匹配,这对应于距离DV(z=0.57)= 2094 +/- 34 Mpc。1.7%,这是有史以来从星系调查中获得的最精确的距离限制。我们将这一结果与以前的BAO测量宇宙学距离阶梯,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,找到一个平坦的宇宙与宇宙学常数的持续支持。

英文摘要:

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 = 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 5σin both the correlation function and power spectrum. Combining with the SDSS-II Luminous Red Galaxy Sample, the detection significance increases to 6.7σ. Fitting for the position of the acoustic features measures the distance to z=0.57 relative to the sound horizon DV /rs = 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 DV(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.

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