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Spitzer imaging of Herschel-ATLAS gravitationally lensed submillimeter sources

Hopwood, R.; Wardlow, J.; Cooray, A.; Khostovan, A. A.; Kim, S.; Negrello, M.; da Cunha, E.; Burgarella, D.; Aretxaga, I.; Auld, R.; Baes, M.; Barton, E.; Bertoldi, F.; Bonfield, D. G.; Blundell, R.; Buttiglione, S.; Cava, A.; Clements, D. L.; Cooke, J.; Dannerbauer, H.; Dariush, A.; de Zotti, G.; Dunlop, J.; Dunne, L.; Dye, S.; Eales, S.; Fritz, J.; Frayer, D.; Gurwell, M. A.; Hughes, D. H.; Ibar, E.; Ivison, R. J.; Jarvis, M. J.; Lagache, G.; Leeuw, L.; Maddox, S.; Michałowski, M. J.; Omont, A.; Pascale, E.; Pohlen, M.; Rigby, E.; Rodighiero, G.; Scott, D.; Serjeant, S.; Smail, I.; Smith, D. J. B.; Temi, P.; Thompson, M. A.; Valtchanov, I.; van der Werf, P.; Verma, A. and Vieira, J. D. (2011). Spitzer imaging of Herschel-ATLAS gravitationally lensed submillimeter sources. Astrophysical Journal Letters, 728(1), article no. L4.

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We present physical properties of two submillimeter selected gravitationally lensed sources, identified in the Herschel Astrophysical Terahertz Large Area Survey. These submillimeter galaxies (SMGs) have flux densities >100 mJy at 500 μm, but are not visible in existing optical imaging. We fit light profiles to each component of the lensing systems in Spitzer IRAC 3.6 and 4.5 μm data and successfully disentangle the foreground lens from the background source in each case, providing important constraints on the spectral energy distributions (SEDs) of the background SMG at rest-frame optical-near-infrared wavelengths. The SED fits show that these two SMGs have high dust obscuration with A V ~ 4-5 and star formation rates of ~100 M yr–1. They have low gas fractions and low dynamical masses compared with 850 μm selected galaxies.

Item Type: Journal Article
Copyright Holders: 2011 The American Astronomical Society
ISSN: 2041-8213
Extra Information: 6 pp.
Keywords: galaxies; starburst galaxies; gravitational lensing
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 31724
Depositing User: Stephen Serjeant
Date Deposited: 30 Jan 2012 17:47
Last Modified: 24 Jul 2015 09:29
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