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Most radio galaxies are hosted by giant gas-poor ellipticals, but somecontain significant amounts of dust, which is likely to be of external origin.In order to characterize the mid-IR properties of two of the most nearby andbrightest merger-remnant radio galaxies of the Southern hemisphere, NGC 1316(Fornax A) and NGC 612 (PKS 0131-36), we used observations with the Wide-fieldInfrared Survey Explorer (WISE) at wavelengths of 3.4, 4.6, 12 and 22 micronand Spitzer mid-infrared spectra. By applying a resolution-enhancementtechnique, new WISE images were produced at angular resolutions ranging from2.6" to 5.5". Global measurements were performed in the four WISE bands, andstellar masses and star-formation rates were estimated using published scalingrelations. Two methods were used to uncover the distribution of dust, onerelying on two-dimensional fits to the 3.4 micron images to model thestarlight, and the other one using a simple scaling and subtraction of the 3.4micron images to estimate the stellar continuum contribution to the emission inthe 12 and 22 micron bands. The two galaxies differ markedly in their mid-IRproperties. The 3.4 micron brightness distribution can be well represented bythe superposition of two Sersic models in NGC 1316 and by a Sersic model and anexponential disk in NGC 612. The WISE colors of NGC 1316 are typical of thoseof early-type galaxies; those of NGC 612 are in the range found forstar-forming galaxies. From the 22 micron luminosity, we infer a star-formationrate of about 0.7 solar masses per year in NGC 1316 and about 7 solar massesper year in NGC 612. Spitzer spectroscopy shows that the 7.7-to-11.3 micron PAHline ratio is significantly lower in NGC 1316 than in NGC 612. The WISE imagesreveal resolved emission from dust in the central 1'-2' of the galaxies.(Abridged)

Mid-infrared dust in two nearby radio galaxies, NGC 1316 (Fornax A) and NGC 612 (PKS 0131-36)