Cosmological constraints from the SDSS luminous red galaxies
Космологические ограничения по данным о ярких красных галактиках SDSS
2006-12-11
SCID: 54.1/buew67kd
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SDSScosmological parametersluminous red galaxiespower spectrum estimationredshift-space distortions
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Abstract (AI)
We measure the large-scale real-space power spectrum $P(k)$ using luminous red galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS) and use this measurement to sharpen constraints on cosmological parameters from the Wilkinson Microwave Anisotropy Probe (WMAP). We employ a matrix-based power spectrum estimation method using Pseudo-Karhunen-Lo\`eve eigenmodes, producing uncorrelated minimum-variance measurements in 20 $k$-bands of both the clustering power and its anisotropy due to redshift-space distortions, with narrow and well-behaved window functions in the range $0.01h/\mathrm{Mpc} 0.1h/\mathrm{Mpc}$ and associated nonlinear complications, yet agree well with more aggressive published analyses where nonlinear modeling is crucial.
Key Findings
1
A matrix-based estimator using Pseudo-Karhunen–Loève eigenmodes yields uncorrelated, minimum-variance measurements in 20 wavenumber bands.
2
Results agree with more aggressive published analyses despite avoiding regimes where nonlinear modeling is crucial.
3
The SDSS LRG power-spectrum measurement sharpens cosmological-parameter constraints derived from WMAP.
4
The analysis jointly measures clustering power and redshift-space-distortion anisotropy over 0.01–0.1 h/Mpc with narrow, well-behaved window functions.
5
The study measures the large-scale real-space power spectrum using luminous red galaxies from the Sloan Digital Sky Survey.
Research Object
Large-scale galaxy clustering of luminous red galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS)
Research Subject
The real-space power spectrum, redshift-space distortion anisotropy, and resulting cosmological parameter constraints
Publication Details
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2006-12-11
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