THE PEAK OF THE COSMIC PERTURBATION SPECTRUM P(K) AND THE 2-DIMENSIONAL DISTRIBUTION OF IRAS SOURCES

We analyse the 2-dimensional distribution of 60-mu m IRAS sources on t he celestial sphere, executing three tests respectively based on the r ms fluctuation and the correlation function of the source number densi ty, and the surface peak number statistics. We show that HDM models fi t our data very well and allow us to select a best value lambda(peak) = 45-55 h(-1) Mpc for the peak wavelength of the spectral function P ( k). For CDM models the tests give acceptable fits (and a very good one for peak statistics) for Omega(o) h either in the range 0.3-0.5 or ar ound 0.1-0.2, but we do not find a parameter interval satisfying all o f our tests simultaneously.