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We study a set of 3319 galaxies in the redshift interval 0.04 < z < 0.15 withfar-infrared (FIR) coverage from the Herschel Stripe 82 survey (HerS), andemission-line measurements, redshifts, stellar masses and star-formation rates(SFRs) from the SDSS (DR7) MPA/JHU database. About 40% of the sample aredetected in the Herschel/SPIRE 250 micron band. Total infrared (TIR)luminosities derived from HerS and ALLWISE photometry allow us to compareinfrared and optical estimates of SFR with unprecedented statistics for diverseclasses of galaxies. We find excellent agreement between TIR-derived andemission line-based SFRs for H II galaxies. Other classes, such as activegalaxies and evolved galaxies, exhibit systematic discrepancies between opticaland TIR SFRs. We demonstrate that these offsets are attributable primarily tosurvey biases and the large intrinsic uncertainties of the D4000- andcolour-based optical calibrations used to estimate the SDSS SFRs of thesegalaxies. Using a classification scheme which expands upon popularemission-line methods, we demonstrate that emission-line galaxies withuncertain classifications include a population of massive, dusty, metal-richstar-forming systems that are frequently neglected in existing studies. We alsostudy the capabilities of infrared selection of star-forming galaxies. FIRselection reveals a substantial population of galaxies dominated by cold dustwhich are missed by the long-wavelength WISE bands. Our results demonstratethat Herschel large-area surveys offer the means to construct large, relativelycomplete samples of local star-forming galaxies with accurate estimates of SFRthat can be used to study the interplay between nuclear activity andstar-formation.

Local SDSS galaxies in the Herschel Stripe82 survey: A critical assessment of optically-derived star-formation rates