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Multifractal measures are applied to three IRAS galaxy subsamples selected bycolour from the PSCz catalogue. As shown by generalised dimension spectrum, hotIRAS galaxies are found less clustered than cold galaxies, but the differenceis very weak. An alternative tool, the conditional multifractal dimensionspectrum reveals apparent peculiarity of the distribution of hot galaxies,especially at high orders. The conditional multifractal measure is basicallymeasuring the environment of selected galaxies. A detailed analysis of thedistribution of galaxies with their number of neighbours turns out that coldgalaxies are more likely living in over dense regions than hot galaxies.Further studies suggest that, since the colour of IRAS galaxies is a good traceof star formation rate, it is possible that we have statistical evidence herefor enhanced star formation rate due to galaxy interactionsComment: minor revision; accepted by A&

Colour dependence of the distribution of IRAS galaxies revealed by multifractal measures