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Discovery of a Multiply Lensed Submillimeter Galaxy in Early HerMES Herschel/SPIRE* Data

Conley, A; Cooray, A; Vieira, JD; Solares, EAG; Kim, S; Aguirre, JE; Amblard, A; ... Zmuidzinas, J; + view all (2011) Discovery of a Multiply Lensed Submillimeter Galaxy in Early HerMES Herschel/SPIRE* Data. The Astrophysical Journal Letters , 732 (2) , Article L35. 10.1088/2041-8205/732/2/L35. Green open access

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Abstract

We report the discovery of a bright (f(250 μm)>400 mJy), multiply lensed submillimeter galaxy HERMES J105751.1+573027 in Herschel/SPIRE Science Demonstration Phase data from the HerMES project. Interferometric 880 μm Submillimeter Array observations resolve at least four images with a large separation of ~9''. A high-resolution adaptive optics Kp image with Keck/NIRC2 clearly shows strong lensing arcs. Follow-up spectroscopy gives a redshift of z = 2.9575, and the lensing model gives a total magnification of μ ~ 11 ± 1. The large image separation allows us to study the multi-wavelength spectral energy distribution (SED) of the lensed source unobscured by the central lensing mass. The far-IR/millimeter-wave SED is well described by a modified blackbody fit with an unusually warm dust temperature, 88 ± 3 K. We derive a lensing-corrected total IR luminosity of (1.43 ± 0.09) × 1013 L ☉, implying a star formation rate of ~2500 M ☉ yr–1. However, models primarily developed from brighter galaxies selected at longer wavelengths are a poor fit to the full optical-to-millimeter SED. A number of other strongly lensed systems have already been discovered in early Herschel data, and many more are expected as additional data are collected.

Type: Article
Title: Discovery of a Multiply Lensed Submillimeter Galaxy in Early HerMES Herschel/SPIRE* Data
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/2041-8205/732/2/L35
Publisher version: http://dx.doi.org/10.1088/2041-8205/732/2/L35
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, galaxies: high-redshift, galaxies: starburst, gravitational lensing: strong, submillimeter: galaxies, SPECTRAL ENERGY-DISTRIBUTIONS, PHOTOMETRIC REDSHIFTS, STAR-FORMATION, NUMBER COUNTS, DUST, ULTRAVIOLET, POPULATION, STARBURSTS, CATALOG, MODELS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10052528
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