Near Infrared Photometry of Lyman-α Emitters at z=3.1 and 3.7 in the Subaru/XMM-Newton Deep Field

We examine rest-frame far ultraviolet (FUV) (1500Å) to optical (V) spectral energy distributions for Lyman-α emitters (LAEs) at z=3.1 and 3.7 in a 1.22 deg^2 area of the Subaru/XMM-Newton Deep Field (SXDF), using multicolor data from the SXDS project (BVRiz) and the UKIDSS/UDS (JK). About 4% of our LAEs are detected in K, i.e., brighter than the 3σ magnitude (K=24.0). We find that while the majority of the K-detected LAEs have a similar M_{1500}-M_{V} vs M_{1500} distribution to LBGs, a few have much redder M_{1500}-M_{V} colors indicative of evolved and/or dusty stellar populations. In addition, a stacking analysis of K-undetected LAEs reveals that the vast majority of our LAEs are lower-mass counterparts to LBGs with similar colors.