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American Astronomical Society, Astrophysical Journal, 2(797), p. 138, 2014

DOI: 10.1088/0004-637x/797/2/138

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Lens Models Ofherschel-Selected Galaxies From High-Resolution Near-Ir Observations

Journal article published in 2014 by J. A. Calanog, Hai Fu, A. Cooray, J. Wardlow, B. Ma, S. Amber, A. J. Baker, M. Baes ORCID, J. Bock, N. Bourne, R. S. Bussmann, C. M. Casey ORCID, S. C. Chapman, D. L. Clements, A. Conley and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present Keck-Adaptive Optics and Hubble Space Telescope high resolution near-infrared (IR) imaging for 500 mu m bright candidate lensing systems identified by the Herschel Multi-tiered Extragalactic Survey and Herschel Astrophysical Terahertz Large Area Survey. Out of 87 candidates with near-IR imaging, 15 (similar to 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 previous lensing models for submillimeter galaxies (SMGs). For four new sources that also have high-resolution submillimeter maps, we test for differential lensing between the stellar and dust components and find that the 880 mu m magnification factor (mu(880)) is similar to 1.5 times higher than the near-IR magnification factor (mu(NIR)), on average. We also find that the stellar emission is similar to 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.