We estimated the luminosity function (LF) of IRAS galaxies in the Point Source Catalog Redshift (PSC z ) survey. The faint end of the PSC z LF is slightly steeper than that of the LF derived by Saunders et al. Using an analytical form for the LF used by Saunders et al., we obtain the following parameters: α = 1.23 ± 0.04, L * = (8.85 ± 1.75) × 10 8 h -2 L ☉ , σ = 0.724 ± 0.010, and ϕ * = (2.34 ± 0.30) × 10 -2 h 3 Mpc -3 . We also examined the evolution in the sample by the simple assumption ϕ * ( z ) ∝ (1 + z ) P and found P = 3.40 ± 0.70. It does not affect the three parameters α, L * , and σ, but ϕ * ( z = 0) is overestimated by up to ~15% if we ignore evolution. We estimated the temperature dependence of the LF. The LFs of warm and cool galaxies are quite different: the LF of warm galaxies has a very steep faint end with α = 1.37. We also discuss a lump found at the brightest end of the LF.
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