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We examine the stacked thermal Sunyaev-Zel\text{'}dovich (SZ) signals for asample of galaxy cluster candidates from the Spitzer-HETDEX Exploratory LargeArea (SHELA) Survey, which are identified in combined optical and infraredSHELA data using the redMaPPer algorithm. We separate the clusters into threerichness bins, with average photometric redshifts ranging from 0.70 to 0.80.The richest bin shows a clear temperature decrement at 148 GHz in the AtacamaCosmology Telescope data, which we attribute to the SZ effect. All richnessbins show an increment at 220 GHz, which we attribute to dust emission fromcluster galaxies. We correct for dust emission using stacked profiles fromHerschel Stripe 82 data, and allow for synchrotron emission using stackedprofiles created by binning source fluxes from NVSS data. We see dust emissionin all three richness bins, but can only confidently detect the SZ decrement inthe highest richness bin, finding $M_{500}$ = $8.7^{+1.7}_{-1.3} \times 10^{13}M_\odot$. Neglecting the correction for dust depresses the inferred mass by 26percent, indicating a partial fill-in of the SZ decrement from thermal dust andsynchrotron emission by the cluster member galaxies. We compare our correctedSZ masses to two redMaPPer mass--richness scaling relations and find that theSZ mass is lower than predicted by the richness. We discuss possibleexplanations for this discrepancy, and note that the SHELA richnesses maydiffer from previous richness measurements due to the inclusion of IR data inredMaPPer.

The Atacama Cosmology Telescope: SZ-based masses and dust emission from IR-selected cluster candidates in the SHELA survey