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We explore the behaviour of [CII]-157.74um forbidden fine-structure lineobserved in a sample of 28 galaxies selected from ~50deg^2 of the H-ATLASsurvey. The sample is restricted to galaxies with flux densities higher thanS_160um>150mJy and optical spectra from the GAMA survey at 0.02<z<0.2. Far-IRspectra centred on this redshifted line were taken with the PACS instrumenton-board the Herschel Space Observatory. The galaxies span 10<log(L_IR/Lo)<12(where L_IR=L_IR[8-1000um]) and 7.3<log(L_[CII]/Lo)<9.3, covering a variety ofoptical galaxy morphologies. The sample exhibits the so-called [CII] deficit athigh IR luminosities, i.e. L_[CII]/L_IR (hereafter [CII]/IR) decreases at highL_IR. We find significant differences between those galaxies presenting[CII]/IR>2.5x10^-3 with respect to those showing lower ratios. In particular,those with high ratios tend to have: (1) L_IR<10^11Lo; (2) cold dusttemperatures, T_d<30K; (3) disk-like morphologies in r-band images; (4) a WISEcolour 0.5<S_12um/S_22um<1.0; (5) low surface brightness Sigma_IR~10^8-9 Lokpc^-2, (6) and specific star-formation rates of sSFR~0.05-3 Gyr^-1. We suggestthat the strength of the far-UV radiation fields (<G_O>) is main parameterresponsible for controlling the [CII]/IR ratio. It is possible that relativelyhigh <G_O> creates a positively charged dust grain distribution, impeding anefficient photo-electric extraction of electrons from these grains to thencollisionally excite carbon atoms. Within the brighter IR population,11<log(L_IR/Lo)<12, the low [CII]/IR ratio is unlikely to be modified by [CII]self absorption or controlled by the presence of a moderately luminous AGN(identified via the BPT diagram).

A multi-wavelength exploration of the [CII]/IR ratio in H-ATLAS/GAMA galaxies out to z=0.2