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We describe the infrared properties of sources detected over ~36 deg^2 of skyin the GAMA 15-hr equatorial field, using data from both the HerschelAstrophysical Terahertz Large-Area Survey (H-ATLAS) and Wide-field InfraredSurvey (WISE). With 5-sigma point-source depths of 34 and 0.048 mJy at 250micron and 3.4 micron, respectively, we are able to identify 50.6% of theH-ATLAS sources in the WISE survey, corresponding to a surface density of ~630deg^{-2}. Approximately two-thirds of these sources have measured spectroscopicor optical/near-IR photometric redshifts of z<1. For sources with spectroscopicredshifts at z<0.3, we find a linear correlation between the infraredluminosity at 3.4 micron and that at 250 micron, with +-50% scatter over ~1.5orders of magnitude in luminosity, ~10^9 - 10^{10.5} L_sun. By contrast, thematched sources without previously measured redshifts (r>~20.5) have 250-350micron flux density ratios that suggest either high-redshift galaxies (z>~1.5)or optically faint low-redshift galaxies with unusually low temperatures(T<~20). Their small 3.4-250 micron flux ratios favor a high-redshift galaxypopulation, as only the most actively star-forming galaxies at low redshift(e.g., Arp 220) exhibit comparable flux density ratios. Furthermore, we find arelatively large AGN fraction (~30%) in a 12 micron flux-limited subsample ofH-ATLAS sources, also consistent with there being a significant population ofhigh-redshift sources in the no-redshift sample.

The Infrared Properties of Sources Matched in the WISE all-sky and Herschel-ATLAS Surveys