Spitzer Imaging of Herschel-atlas Gravitationally Lensed Submillimeter Sources

R. Hopwood, J. Wardlow, A. Cooray, A. A. Khostovan, S. Kim, M. Negrello, E. da Cunha, D. Burgarella, I. Aretxaga, R. Auld, M. Baes, E. Barton, F. Bertoldi, D. G. Bonfield, R. Blundell, S. Buttiglione, A. Cava, D. L. Clements, J. Cooke, H. DannerbauerA. Dariush, G. de Zotti, J. Dunlop, L. Dunne, S. Dye, S. Eales, J. Fritz, D. Frayer, M. A. Gurwell, D. H. Hughes, E. Ibar, R. J. Ivison, M. J. Jarvis, G. Lagache, L. Leeuw, S. Maddox, M. J. Michałowski, A. Omont, E. Pascale, M. Pohlen, E. Rigby, G. Rodighiero, D. Scott, S. Serjeant, I. Smail, D. J. B. Smith, P. Temi, M. A. Thompson, I. Valtchanov, P. van der Werf, A. Verma, J. D. Vieira

Research output: Contribution to journalArticlepeer-review

Abstract

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 sun yr-1. They have low gas fractions and low dynamical masses compared with 850 μm selected galaxies.
Original languageEnglish
Article numberL4
JournalAstrophysical Journal Letters
Volume728
Issue number1
DOIs
Publication statusPublished - 1 Feb 2011

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