The clustering of the SDSS DR7 main Galaxy sample - I. A 4 per cent distance measure at z=0.15

被引：1482

作者：

Ross, Ashley J. ^{[1
,2
]}

Samushia, Lado ^{[1
,3
,4
]}

Howlett, Cullan ^{[1
]}

Percival, Will J. ^{[1
]}

Burden, Angela ^{[1
]}

Manera, Marc ^{[1
,5
]}

机构：

[1] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England

[2] Ohio State Univ, Ctr Cosmol & AstroParticle Phys, Columbus, OH 43210 USA

[3] Kansas State Univ, Dept Phys, Manhattan, KS 66506 USA

[4] Ilia State Univ, Natl Abastumani Astrophys Observ, GE-1060 Tbilisi, Georgia

[5] UCL, London WC1E 6BT, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 449卷 / 01期

基金：

美国国家航空航天局; 欧洲研究理事会; 美国国家科学基金会;

关键词：

cosmology: observations; distance scale; BARYON ACOUSTIC-OSCILLATIONS; DIGITAL SKY SURVEY; PROBE WMAP OBSERVATIONS; SPECTROSCOPIC TARGET SELECTION; POWER-SPECTRUM ANALYSIS; DATA RELEASE; REDSHIFT SURVEY; COSMOLOGICAL PARAMETERS; RECONSTRUCTION; UNIVERSE;

D O I：

10.1093/mnras/stv154

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We create a sample of spectroscopically identified galaxies with z < 0.2 from the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7), covering 6813 deg(2). Galaxies are chosen to sample the highest mass haloes, with an effective bias of 1.5, allowing us to construct 1000 mock galaxy catalogues (described in Paper II), which we use to estimate statistical errors and test our methods. We use an estimate of the gravitational potential to 'reconstruct' the linear density fluctuations, enhancing the baryon acoustic oscillation (BAO) signal in the measured correlation function and power spectrum. Fitting to these measurements, we determine D-V(z(eff) = 0.15) = (664 +/- 25)(r(d)/r(d, fid)) Mpc; this is a better than 4 per cent distance measurement. This 'fills the gap' in BAO distance ladder between previously measured local and higher redshift measurements, and affords significant improvement in constraining the properties of dark energy. Combining our measurement with other BAO measurements from Baryon Oscillation Spectroscopic Survey and 6-degree Field Galaxy Redshift Survey galaxy samples provides a 15 per cent improvement in the determination of the equation of state of dark energy and the value of the Hubble parameter at z = 0 (H-0). Our measurement is fully consistent with the Planck results and the Lambda cold dark matter concordance cosmology, but increases the tension between Planck+BAO H-0 determinations and direct H-0 measurements.

引用

页码：835 / 847

页数：13

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