Lens models of Herschel-selected galaxies from high-resolution near-IR observations

Calanog, J.A. and Fu, Hai and Cooray, A. and Wardlow, J. and Ma, B. and Amber, S. and Baker, A.J. and Baes, M. and Bock, J. and Bourne, N. and Bussmann, R.S. and Casey, C.M. and Chapman, S.C. and Clements, D.L. and Conley, A. and Dannerbauer, H. and De Zotti, G. and Dunne, L. and Dye, S. and Eales, S. and Farrah, D. and Furlanetto, C. and Harris, A.I. and Ivison, R.J. and Kim, S. and Maddox, S.J. and Magdis, G. and Messias, H. and Michałowski, M.J. and Negrello, M. and Nightingale, J. and O'Bryan, J.M. and Oliver, S.J. and Riechers, D. and Scott, D. and Serjeant, S. and Simpson, J. and Smith, M. and Timmons, N. and Thacker, C. and Valiante, E. and Vieira, J.D. (2014) Lens models of Herschel-selected galaxies from high-resolution near-IR observations. Astrophysical Journal, 797 (2). p. 138. ISSN 1538-4357

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We present Keck-Adaptive Optics and Hubble Space Telescope high resolution near-infrared (IR) imaging for 500 μm 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 (~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 μm magnification factor (μ880) is ~1.5 times higher than the near-IR magnification factor (μNIR), 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.

Item Type: Article
Keywords: galaxies: star formation; gravitational lensing: strong; submillimeter: galaxies
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1088/0004-637X/797/2/138
Depositing User: Eprints, Support
Date Deposited: 27 Apr 2017 12:55
Last Modified: 28 Apr 2017 12:39
URI: http://eprints.nottingham.ac.uk/id/eprint/42373

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