Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-06-05
Mon.Not.Roy.Astron.Soc.318:681,2000
Astronomy and Astrophysics
Astrophysics
13 pages, figures included (needs mn.sty), in press on MNRAS
Scientific paper
10.1046/j.1365-8711.2000.03739.x
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.
Branchini Enzo
Efstathiou George
Frenk Carlos S.
Maddox Steve J.
McMahon Richard G.
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