Monthly Notices of the Royal Astronomical Society· 2014Q1
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: baryon acoustic oscillations in the Data Releases 10 and 11 Galaxy samples
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- 2014year
Short summary
A 7-sigma detection of baryon acoustic oscillations (BAO) in nearly one million galaxies from the SDSS-III DR11 sample yields a 1% measurement of the cosmic distance scale.
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Key points
- Detected baryon acoustic oscillations (BAO) with over 7-sigma significance in the SDSS-III DR11 galaxy sample.
- The DR11 sample comprises nearly one million galaxies, covering 8500 square degrees and a redshift range of 0.2 < z < 0.7.
- Achieved a 1% measurement of the cosmic distance scale, yielding r_d = 149.28 Mpc in the fiducial cosmology.
- The characteristic distance D_V was measured as (1264 ± 25 Mpc)(r_d /r_d,fid ).
AI-generated from the title and abstract; the full text is not read.
Abstract
We present a one per cent measurement of the cosmic distance scale from the detections of the baryon acoustic oscillations (BAO) in the clustering of galaxies from the Baryon Oscillation Spectroscopic Survey, which is part of the Sloan Digital Sky Survey III. Our results come from the Data Release 11 (DR11) sample, containing nearly one million galaxies and covering approximately 8500 square degrees and the redshift range 0.2 < z < 0.7. We also compare these results with those from the publicly released DR9 and DR10 samples. Assuming a concordance cold dark matter ( CDM) cosmological model, the DR11 sample covers a volume of 13 Gpc 3 and is the largest region of the Universe ever surveyed at this density. We measure the correlation function and power spectrum, including density-field reconstruction of the BAO feature. The acoustic features are detected at a significance of over 7 in both the correlation function and power spectrum. Fitting for the position of the acoustic features measures the distance relative to the sound horizon at the drag epoch, r d , which has a value of r d,fid = 149.28 Mpc in our fiducial cosmology. We find D V = (1264 25 Mpc)(r d /r d,fid )
The authors' abstract, as published at the source. Monthly Notices of the Royal Astronomical Society, 2014 · DOI ↗
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Field: Astronomy and Astrophysics
Astronomy and AstrophysicsPhysics and Astronomy