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We study the fraction of stellar radiation absorbed by dust, f_abs, in 814galaxies of different morphological types. The targets constitute the vastmajority (93%) of the DustPedia sample, including almost all large (opticaldiameter larger than 1'), nearby (v <= 3000 km/s) galaxies observed with theHerschel Space Observatory. For each object, we model the spectral energydistribution from the ultraviolet to the sub-millimetre using the dedicated,aperture-matched DustPedia photometry and the fitting code CIGALE. The value off_abs is obtained from the total luminosity emitted by dust and from thebolometric luminosity, which are estimated by the fit. On average, 19% of thestellar radiation is absorbed by dust in DustPedia galaxies. The fraction risesto 25% if only late-type galaxies are considered. The dependence of f_abs onmorphology, showing a peak for Sb-Sc galaxies, is weak; it reflects a stronger,yet broad, positive correlation with the bolometric luminosity, which isidentified for late-type, disk-dominated, high-specific-star-formation rate,gas-rich objects. We find no variation of f_abs with inclination, at odds withradiative transfer models of edge-on galaxies. These results call for aself-consistent modelling of the evolution of the dust mass and geometry alongthe build-up of the stellar content. We also provide template spectral energydistributions in bins of morphology and luminosity and study the variation off_abs with stellar mass and specific star formation rate. We confirm that thelocal Universe is missing the high f_abs}, luminous and actively star-formingobjects necessary to explain the energy budget in observations of theextragalactic background light.

The fraction of bolometric luminosity absorbed by dust in DustPedia galaxies