Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.327..689t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 327, Issue 3, pp. 689-696.
Astronomy and Astrophysics
Astronomy
20
Cosmology: Theory, Dark Matter, Large-Scale Structure Of Universe
Scientific paper
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+0.14 and the amplitude of galaxy clustering on a scale of k=0.1hMpc-1 is Δg,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. While this is compatible with results from the cosmic microwave background (CMB), with a small degree of tilt, it disagrees with the amplitude of matter perturbations estimated from the abundance of clusters by a factor of 2, independent of cosmology. A preliminary model fitting analysis combining the CMB with either the PSCz or cluster abundances shows that the cosmological matter density parameter Ωm=0.29+/-0.09, and the IRAS bias parameter b=1.22+/-0.28. However, the cluster abundances suggest that Δm,0.1=0.60+/-0.09 and ns=0.96+/-0.03, while the PSCz requires Δm,0.1=0.34+/-0.05 and ns=0.81+/-0.05. Given the physics of galaxy formation is poorly constrained, we conclude that IRAS galaxies and mass are only partially correlated.
Ballinger W. E.
Heavens Alan F.
Tadros Helen
Taylor Andy N.
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