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We present new empirical calibrations to estimate resolved and integratedtotal infrared luminosities from Spitzer and Herschel bands used asmonochromatic or combined tracers. We base our calibrations on resolvedelements of nearby galaxies (3 to 30 Mpc) observed with Herschel. We perform aresolved SED modelling of these objects using the Draine and Li (2007) dustmodels and investigate the influence of the addition of SPIRE measurements inthe estimation of LTIR. We find that using data up to 250 um leads to localLTIR values consistent with those obtained with a complete coverage (up to 500um) within 10 per cent for most of our resolved elements. We then study thedistribution of energy in the resolved SEDs of our galaxies. The bulk of energy(30-50 per cent) is contained in the (70-160 um) band. The (24-70 um) fractiondecreases with increasing metallicity. The (160-1100 um) submillimeter band canaccount for up to 25 per cent of the LTIR in metal-rich galaxies. Weinvestigate the correlation between TIR surface brightnesses/luminosities andmonochromatic Spitzer and Herschel surface brightnesses/luminosities. The threePACS bands can be used as reliable monochromatic estimators of the LTIR, the100 um band being the most reliable monochromatic tracer. There is also astrong correlation between the SPIRE 250um and LTIR, although with more scatterthan for the PACS relations. We also study the ability of our monochromaticrelations to reproduce integrated LTIR of nearby galaxies as well as LTIR ofz=1-3 sources. Finally, we provide calibration coefficients that can be used toderive TIR surface brightnesses/luminosities from a combination of Spitzer andHerschel surface brightnesses/fluxes and analyse the associated uncertainties.

Calibration of the total infrared luminosity of nearby galaxies from Spitzer and Herschel bands