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Spitzerimaging 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, Robbie Richard, Baes, M., Barton, E., Bertoldi, F., Bonfield, D. G., Blundell, R., Buttiglione, S., Cava, A., Clements, D. L., Cooke, J., Dannerbauer, H., Dariush, Aliakbar, de Zotti, G., Dunlop, J., Dunne, L., Dye, Simon, Eales, Stephen Anthony, Fritz, J., Frayer, D., Gurwell, M. A., Hughes, D. H., Ibar, E., Ivison, R. J., Jarvis, M. J., Lagache, G., Leeuw, L., Maddox, S., Michaowski, M. J., Omont, A., Pascale, Enzo, Pohlen, Michael, 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. Spitzerimaging of Herschel-ATLAS gravitationally lensed submillimeter sources. Astrophysical Journal Letters 728 (1) , L4. 10.1088/2041-8205/728/1/L4

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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 ☉ yr–1. They have low gas fractions and low dynamical masses compared with 850 μm selected galaxies.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: galaxies: individual (SDP.81: H-ATLAS J090311.6+003906, SDP.130: H-ATLAS J091305.0-005343); galaxies: starburst; gravitational lensing: strong
Publisher: Institute of Physics
ISSN: 2041-8205
Last Modified: 04 Jun 2017 03:17
URI: http://orca-mwe.cf.ac.uk/id/eprint/19405

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