The luminosity function of IRAS Point Source Catalog Redshift survey galaxies

We estimated the luminosity function (LF) of IRAS galaxies in the Point Source Catalog Redshift (PSCz) survey. The faint end of the PSCz 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: alpha = 1.23 +/- 0.04, L-* = (8.85 +/- 1.75) x 10(8) h(-2) L-circle dot, sigma = 0.724 +/- 0.010, and phi(*) = (2.34 +/- 0.30) x 10(-2) h(3) Mpc(-3) examined the evolution in the sample by the simple assumption phi(*)(z) proportional to (1 + z)(P) and found P = 3.40 +/- 0.70. It does not affect the three parameters alpha, L-*, and sigma, but phi(* (z = 0)) is overestimated by up to similar to15% 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 alpha = 1.37. We also discuss a lump found at the brightest end of the LF.