Application of Data Compression Methods to the Redshift-space distortions of the PSCz galaxy catalogue

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dc.creatorTaylor, A. N.
dc.creatorBallinger, W. E.
dc.creatorHeavens, A. F.
dc.creatorTadros, H.
dc.date2000-07-05
dc.date.accessioned2026-07-07T01:54:16Z
dc.date.available2026-07-07T01:54:16Z
dc.descriptionWe 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 $β= 0.39 \pm 0.12$ and the amplitude of galaxy clustering on a scale of $k=0.1 \Mpch$ is $Δ_{\rm gal}(0.1)=0.42 \pm 0.02$. Combining these we find the amplitude of mass perturbations is $Δ_m(0.1)=(0.16\pm0.04) Ω_m^{-0.6}$. A preliminary model fitting analysis combining the PSCz amplitudes with the CMB and abundance of clusters yields the cosmological matter density parameter $Ω_m=0.16\pm 0.03$, the amplitude of primordial perturbations $Q=(8.4\pm 3.8) \times 10^{-5}$, and the IRAS bias parameter $b=0.84\pm 0.28$.
dc.description6 pages, Latex, Submitted to MNRASLett
dc.identifierhttps://arxiv.org/abs/astro-ph/0007048
dc.identifierhttp://arxiv.org/abs/astro-ph/0007048
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1280
dc.subjectAstrophysics
dc.titleApplication of Data Compression Methods to the Redshift-space distortions of the PSCz galaxy catalogue
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