The 1-point PDF of the Initial Conditions of our Local Universe from the IRAS PSC redshift catalogue

Abstract

The algorithm ZTRACE of Monaco & Efstathiou (1999) is applied to the IRAS PSCz catalogue to reconstruct the initial conditions of our local Universe with a resolution down to ~5 Mpc/h. The 1-point PDF of the reconstructed initial conditions is consistent with the assumptions that (i) IRAS galaxies trace mass on scales of ~5 Mpc/h, and (ii) the statistics of primordial density fluctuations is 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.

arXiv comment13 pages, figures included (needs mn.sty), in press on MNRAS

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Cited by in corpus (4)

• Reconstruction of primordial density fields
• Estimating cosmic velocity fields from density fields and tidal tensors
• Cosmological Implications of the PSCz PDF and its Moments
• Recovering the Initial Condition of our Local Universe from NOG and PSCz Catalogues