The percentage of stellar light re-radiated by dust in late-type Virgo Cluster galaxies

upmath eurm10 AMSa msam10 0upmath19 0upmath16 0upmath40 3AMSa36 3AMSa3E normalcmrmit boldcmrbxit [1] 1 [1] 1 [1] 1 normalcmrbxit boldcmrbxit normalcmssbxn boldcmssbxn @mathgroup@group @mathgroup@normal@groupeurmn @mathgroup@bold@groupeurbn @mathgroup@group @mathgroup@normal@groupmsamn @mathgroup@bold@groupmsamn @group19 @group16 @group40 @group36 @group3E [1] 1 [1] 1 [1] 1 OT1cmrbxit boldOT1cmrbxit OT1cmssbxn boldOT1cmssbxn UPMUeurmn UPMboldUeurbn AMSaUmsamn Γ0UPM”19Γ0UPM”16Γ0UPM”40Λ3AMSa”36Λ3AMSa”3E The percentage of stellar light re-radiated by dust in late-type Virgo Cluster galaxies [C.C. Popescu and R.J. Tuffs] Cristina C. Popescu and Richard. J. Tuffs Accepted 2002 July 19. Received 2002 May 17; firstpage–lastpage 2002 document firstpage abstract We show that the mean percentage of stellar light re-radiated by dust is ∼ 30% 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% for early spirals to up to ∼ 50% 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.