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If indeed early type galaxies used up most of their gas to form stars in atime short compared to their collapse time and if a roughly constant fractionof metals is locked up in dust grains, these galaxies may easily become opaqueto starlight and emit most of their luminosity in the far-IR. The correspondingspectral energy distribution matches remarkably well the observed continuumspectrum of the ultraluminous galaxy IRAS F$10214+4724$ from UV to sub-mmwavelengths, i.e. over almost four decades in frequency, for a galactic age$\lsim 1\,$Gyr. The bolometric luminosity in this model is $\simeq 2.7\times10^{14}\Lsol$ ($H_0 =50\,\hbox{km}\,\hbox{s}^{-1} \,\hbox{Mpc}^{-1}$, $\Omega=1$), i.e. somewhat lower than implied by previous models. In the presentframework, the bolometric luminosity of the galaxy is expected to decrease by afactor $\gsim 30$ during the subsequent evolution.Comment: TEX, 6 pages, 3 figures upon reques

A model for the continuum energy distribution of the ultraluminous galaxy IRAS Formula