We present the first measurement of the angular two-point correlation function for AKARI 90μm point sources, detected outside of the Milky Way plane and selected as candidates for extragalactic sources. This is the first measurement of the large-scale angular clustering of galaxies selected in the far-infrared after IRAS. We find a positive clustering signal in both hemispheres extending up to ~ 40 degrees, without any significant fluctuations at larger scales. The observed correlation function is well fitted by a power law function. However, southern galaxies seem to be more strongly clustered than northern ones and the difference is statistically significant. The reason for this difference - technical or physical - is still to be found.

The power spectrum of the galaxy distribution is accurately measured up to wavelengths over 100h−1 100h−1 Mpc from the CfA 1 and 2 catalogs. We find that our results agree with power spectra calculated by others from smaller samples of optical, radio and infrared galaxies. The power spectrum of an open CDM model (Ωh Ωh = 0.2 and δ8 δ8 = 1; see below for definitions) best approximates the observed power spectrum. The power spectrum of the standard COM model (Ωh Ωh = 0.5 and δ8 δ8 = 1) is inconsistent with the observed one at the 99% confidence level. Our best estimation of the corresponding correlation function in real space is ξ(r)=(r/6.2h−1Mpc)−1.8 ξ(r)=(r/6.2h−1Mpc)−1.8 for r < 20h−1 20h−1 Mpc.