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We present a new submm/mm galaxy counterpart identification technique whichbuilds on the use of Spitzer IRAC colors as discriminators between likelycounterparts and the general IRAC galaxy population. Using 102 radio- andSMA-confirmed counterparts to AzTEC sources across three fields (GOODS-N,GOODS-S, and COSMOS), we develop a non-parametric IRAC color-colorcharacteristic density distribution (CDD), which, when combined with positionaluncertainty information via likelihood ratios, allows us to rank all potentialIRAC counterparts around SMGs and calculate the significance of each rankingvia the reliability factor. We report all robust and tentative radiocounterparts to SMGs, the first such list available for AzTEC/COSMOS, as wellas the highest ranked IRAC counterparts for all AzTEC SMGs in these fields asdetermined by our technique. We demonstrate that the technique is free of radiobias and thus applicable regardless of radio detections. For observations madewith a moderate beamsize (~18"), this technique identifies ~85 per cent of SMGcounterparts. For much larger beamsizes (>30"), we report identification ratesof 33-49 per cent. Using simulations, we demonstrate that this technique is animprovement over using positional information alone for observations withfacilities such as AzTEC on the LMT and SCUBA-2 on JCMT.

Submm/mm Galaxy Counterpart Identification Using a Characteristic Density Distribution