The percentage of stellar light re-radiated by dust in late-type Virgo   Cluster galaxies
  We show that the mean percentage of stellar light re-radiated by dust is ~30 percent for the Virgo Cluster late-spirals measured with ISOPHOT by Tuffs et al. (2002). A strong dependence of this ratio with morphological type was found, ranging from typical values of ~15 percent for early spirals to up to ~50 percent for some late spirals. The extreme BCDs can have even higher percentages of their bolometric output re-radiated in the thermal infrared. Luminosity correction factors for the cold dust component are given for general use in converting far-infrared (FIR) luminosities derived from IRAS. 
C.C. Popescu (1,2) and R.J. Tuffs (3) ((1) OCIW, (2) IPAC/Caltech, (3)   MPIK)