Lens Models of Herschel-selected Galaxies from High-resolution Near-IR Observations
We present Keck-Adaptive Optics and Hubble Space Telescope high resolution near-infrared (IR) imaging for 500 m-bright candidate lensing systems identi ed by the Herschel Multi-tiered Extragalactic Survey (HerMES) and Herschel Astrophysical Terahertz Survey (H-ATLAS). Out of 87 candidates with near-IR imaging, 15 ( 17%) display clear near-IR lensing morphologies. We present near-IR lens models to reconstruct and recover basic rest-frame optical morphological properties of the background galaxies from 12 new systems. Sources with the largest near-IR magni cation factors also tend to be the most compact, consistent with the size bias predicted from simulations and previous lensing models for sub-millimeter galaxies. For four new sources that also have high-resolution sub-mm maps, we test for di erential lensing between the stellar and dust components and nd that the 880 m magni cation factor ( 880) is 1:5 times higher than the near-IR magni cation factor ( NIR), on average. We also nd that the stellar emission is 2 times more extended in size than dust. The rest-frame optical properties of our sample of Herschel-selected lensed SMGs are consistent with those of unlensed SMGs, which suggests that the two populations are similar.