Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-05-02
Astronomy and Astrophysics
Astrophysics
submitted to ApJ; uuencoded-compressed-tarred PostScript file including figures. Milano Preprint # tbd
Scientific paper
We discuss the effects of redshift--space distortions on the estimate of high order galaxy correlation functions. We use both the Perseus--Pisces redshift survey and the results of high--resolution N--body simulations to explore the consequences of working in redshift space on the detection of deviations from hierarchical clustering. Both for real and simulated data, significant deviations from hierarchical clustering seem to be present in real space. Their behaviour is coherent with that expected from an initially biased galaxy field, once the displacement from the sites where galaxies formed, due to the nonlinear gravitational evolution, is taken into account. The passage to redshift space has the net effect of filtering out the higher powers required to fit the distribution in real space. This magnifies the distortions operated by nonlinear evolution on the initial distribution, erasing the residual narrow scale range (2--5~$h^{-1}$Mpc) where deviations from hierarchical clustering are still detectable in real space. We conclude that such deviations can hardly be estimated using data in redshift space.
Bonometto Silvio A.
Ghigna Sebastiano
Giovanelli Riccardo
Guzzo Luigi
Haynes Martha P.
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