Measuring the matter density using baryon oscillations in the SDSS

被引：136

作者：

Percival, Will J.

Nichol, Robert C.

Eisenstein, Daniel J.

Weinberg, David H.

Fukugita, Masataka

Pope, Adrian C.

Schneider, Donald P.

Szalay, Alex S.

Vogeley, Michael S.

Zehavi, Idit

Bahcall, Neta A.

Brinkmann, Jon

Connolly, Andrew J.

Loveday, Jon

Meiksin, Avery

机构：

[1] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth, Hants, England

[2] Univ Arizona, Steward Observ, Tucson, AZ USA

[3] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

[4] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba, Japan

[5] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[6] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[7] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[8] Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA

[9] Case Western Reserve Univ, Dept Astron, Cleveland, OH 44106 USA

[10] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[11] Apache Point Observ, Sunspot, NM USA

[12] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA

[13] Univ Sussex, Ctr Astron, Brighton BN1 9QH, E Sussex, England

[14] Univ Edinburgh, Royal Observ, SUPA, Inst Astron, Edinburgh, Midlothian, Scotland

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 657卷 / 01期

基金：

英国科学技术设施理事会;

关键词：

cosmological parameters; large-scale structure of universe;

D O I：

10.1086/510772

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We measure the cosmological matter density by observing the positions of baryon acoustic oscillations in the clustering of galaxies in the Sloan Digital Sky Survey (SDSS). We jointly analyze the main galaxies and LRGs in the SDSS DR5 sample, using over half a million galaxies in total. The oscillations are detected with 99.74% confidence (3.0 sigma assuming Gaussianity) compared to a smooth power spectrum. When combined with the observed scale of the peaks within the CMB, we find a best-fit value of Omega(M) = 0.256(-0.024)(+0.029) (68% confidence interval) for a flat Lambda cosmology when marginalizing over the Hubble parameter and the baryon density. This value of the matter density is derived from the locations of the baryon oscillations in the galaxy power spectrum and in the CMB, and does not include any information from the overall shape of the power spectra. This is an extremely clean cosmological measurement, as the physics of the baryon acoustic oscillation production is well understood, and the positions of the oscillations are expected to be independent of systematics such as galaxy bias.

引用

页码：51 / 55

页数：5

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