2002/05/29 by Kazuhiro Yamamoto · 7 citations
Physics and Astronomy · #Anisotropy #Astrophysics #Baryon #Constraint (computer-aided design) #Cosmic microwave background #Cosmology #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Geometry #Physics #Quantum mechanics #Redshift #Redshift survey #Spectral density #Statistics #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2002.05575.x
published in Monthly Notices of the Royal Astronomical Society 334(4), 958-962 (Oxford University Press) · 16 pages, 6 figures, MNRAS, in press
arxiv created 2002/05/29 · openalex publication_date 2002/08/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
We obtain constraints on the cosmological density parameters, Ωm and Ωb, by comparing the preliminary measurement of the quasi-stellar object (QSO) power spectrum from the Two-Degree Field (2dF) QSO Redshift (2QZ) survey with results from an analytic technique of power spectrum estimation, described herein. We demonstrate the validity of the analytic approach by comparing the results with the power spectrum of an N-body simulation. We find a better fit to the shape of the QSO power spectrum for low-density models with Ωm= 0.1–0.4. We show that a finite baryon fraction Ωb/Ωm= 0.2, consistent with observations of the cosmic microwave background anisotropies and nucleosynthesis, fits the observational result of the 2QZ survey better, though the constraint is not very tight. By using the Fisher matrix technique, we investigate just how large a survey would be required before a significant constraint on the density parameters could be obtained. We demonstrate that the constraint could be significantly improved if the survey was four times larger.