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On the basis of observations by Spitzer and Herschel, we present and analysethe correlations between various monochromatic infrared (IR) luminosities forstar-forming galaxies, selected from two northern Spitzer Wide-area InfraRedExtragalactic Survey (SWIRE) fields. The 24- and 70 micron luminosities (L[24]and L[70]), which are dominated by the continuum of very small grains (VSGs)and warm dust in thermal equilibrium, respectively, correlate tightly withongoing star formation. The contribution from cool dust excited by evolvedstars also increases as the wavelength increases in the far-infrared (FIR)wavelength range. The spectral features of ionized polycyclic aromatichydrocarbons (PAHs) around rest-frame 8 micron are excited by the moderatedradiation field related to evolved stars as well, rather than by the intensiveradiation field related to young stars. Even though the carriers of PAHs couldbe treated as types of VSG with a smaller scale, the radiation conditionbetween PAHs and classic VSGs seems to be significantly different. The formulaeto calculate the total infrared luminosity L[TIR] using L[8(dust)] and L[24]are re-scaled and we find that the L[8(dust)] (L[24]) formula likelyunderestimates (overestimates) L[TIR] for galaxies with unusual current starformation activity.

The discrepancy in the mid-infrared continuum and the features of polycyclic aromatic hydrocarbons for Spitzer and Herschel SWIRE-field galaxies