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The one-point PDF of the initial conditions of our local Universe from the IRAS PSC redshift catalogue

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The algorithmztraceof Monaco & Efstathiou is applied to the IRAS PSCz catalogue to reconstruct the initial conditions of our local Universe with a resolution down to ~5 h−1 Mpc. The one-point probability distribution function (PDF) of the reconstructed initial conditions is consistent with the assumptions that: (i) IRAS galaxies trace mass on scales of ~5 h−1 Mpc and (ii) the statistics of the primordial density fluctuations are Gaussian. We use simulated PSCz catalogues, constructed from N-body simulations with Gaussian initial conditions, to show that local non-linear bias can cause the recovered initial PDF (assuming no bias) to be non-Gaussian. However, for plausible bias models, the distortions of the recovered PDF would be difficult to detect using the volume finely sampled by the PSCz catalogue. So, for Gaussian initial conditions, a range of bias models remain compatible with our PSCz reconstruction results.
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Keywords: cosmology: theory; galaxies: distances and redshifts; galaxies: statistics; large-scale structure of Universe

Document Type: Research Article

Affiliations: 1: Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 2: Kapteyn Sterrewacht, Rijksuniversiteit Groningen, Postbus 800, 9700, AV Groningen, the Netherlands 3: Department of Physics, University of Durham, Durham DH1 3LE 4: Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ 5: Institute for Astronomy, Blackford Hill, Edinburgh EH9 3RJ 6: Nuclear and Astrophysics Laboratory, Keble Road, Oxford OX1 3RH 7: MPI-Astrophysik, Karl-Schwarzschild-Strasse 1, Garching bei Munchen, Germany D-85740

Publication date: November 1, 2000

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