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We present SCUBA-2 450{\mu}m and 850{\mu}m observations of the W40 complex inthe Serpens-Aquila region as part of the James Clerk Maxwell Telescope (JCMT)Gould Belt Survey (GBS) of nearby star-forming regions. We investigateradiative heating by constructing temperature maps from the ratio of SCUBA-2fluxes using a fixed dust opacity spectral index, {\beta} = 1.8, and a beamconvolution kernel to achieve a common 14.8" resolution. We identify 82 clumpsranging between 10 and 36K with a mean temperature of 20{\pm}3K. Clumptemperature is strongly correlated with proximity to the external OBassociation and there is no evidence that the embedded protostars significantlyheat the dust. We identify 31 clumps that have cores with densities greaterthan 105cm{^{-3}}. Thirteen of these cores contain embedded Class 0/Iprotostars. Many cores are associated with bright-rimmed clouds seen inHerschel 70 {\mu}m images. From JCMT HARP observations of the 12CO 3-2 line, wefind contamination of the 850{\mu}m band of up to 20 per cent. We investigatethe free-free contribution to SCUBA-2 bands from large-scale and ultracompact Hii regions using archival VLA data and find the contribution is limited toindividual stars, accounting for 9 per cent of flux per beam at 450 {\mu}m or12 per cent at 850 {\mu}m in these cases. We conclude that radiative heatinghas potentially influenced the formation of stars in the Dust Arc sub-region,favouring Jeans stable clouds in the warm east and fragmentation in the coolwest.

The JCMT Gould Belt Survey: Evidence for radiative heating and contamination in the W40 complex