2000/07/05 by A. N. Taylor, Taylor, A. N., William E. Ballinger +7 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Scientific Research and Discoveries #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0007048
6 pages, Latex, Submitted to MNRASLett
arxiv created 2000/07/05 · openalex publication_date 2000/07/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We apply a spherical harmonic analysis to the Point Source Redshift Survey (PSCz), to compute the real-space galaxy power spectrum and the degree of redshift distortion caused by peculiar velocities. We employ new parameter eigenvector and hierarchical data compression techniques, allowing a much larger number of harmonic modes to be included, and correspondingly smaller error bars. Using 4644 harmonic modes, compressed to 2278, we find that the IRAS redshift-space distortion parameter is β= 0.39 ± 0.12 and the amplitude of galaxy clustering on a scale of k=0.1 \Mpch is Δ\rm gal(0.1)=0.42 ± 0.02. Combining these we find the amplitude of mass perturbations is Δm(0.1)=(0.16±0.04) Ωm-0.6. A preliminary model fitting analysis combining the PSCz amplitudes with the CMB and abundance of clusters yields the cosmological matter density parameter Ωm=0.16± 0.03, the amplitude of primordial perturbations Q=(8.4± 3.8) × 10-5, and the IRAS bias parameter b=0.84± 0.28.