We present Keck-Adaptive Optics and Hubble Space Telescope high resolution near-infrared (IR) imaging for 500 um-bright candidate lensing systems identified by the Herschel Multi-tiered Extra-galactic 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 magnification factors also tend to be the most compact, consistent with the size bias predicted from simulations and pre- vious lensing models for sub-millimeter galaxies. For four new sources that also have high-resolution sub-mm maps, we test for differential lensing between the stellar and dust components and find that the 880 um magnification factor (u_880) is ~1.5 times higher than the near-IR magnification factor (u_NIR), on average. We also find 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.
@article{arxiv.1406.1487,
title = {Lens Models of Herschel-Selected Galaxies From High-Resolution Near-IR Observations},
author = {J. A. Calanog and Hai Fu and A. Cooray and J. Wardlow and B. Ma and S. Amber and M. Baes and J. Bock and N. Bourne and R. S. Bussmann and C. M. Casey and S. C. Chapman and D. L. Clements and A. Conley and H. Dannerbauer and G. DeZotti and L. Dunne and S. Dye and S. Eales and D. Farrah and C. Furlanetto and A. I. Harris and R. J. Ivison and S. J. Maddox and G. Magdis and M. J. Michalowski and M. Negrello and J. Nightingale and J. M. O'Bryan and S. J. Oliver and D. Riechers and D. Scott and S. Serjeant and J. Simpson and M. Smith and N. Timmons and C. Thacker and E. Valiante and J. D. Vieira},
journal= {arXiv preprint arXiv:1406.1487},
year = {2015}
}