| HAL : hal-00662042, version 1 |
| arXiv : 1104.4113 |
| Fiche détaillée | Récupérer au format |
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| Discovery of a Multiply-Lensed Submillimeter Galaxy in Early HerMES Herschel/SPIRE Data |
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| A. Conley 1A. Cooray |
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| (20/04/2011) |
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| We report the discovery of a bright ($f(250\mum) > 400$ mJy), multiply-lensed submillimeter galaxy \obj\ in {\it Herschel}/SPIRE Science Demonstration Phase data from the HerMES project. Interferometric 880\mum\ Submillimeter Array observations resolve at least four images with a large separation of $\sim 9\arcsec$. A high-resolution adaptive optics $K_p$ 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 $\mu \sim 11 \pm 1$. 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, $88 \pm 3$ K. We derive a lensing-corrected total IR luminosity of $(1.43 \pm 0.09) \times 10^{13}\, \mathrm{L}_{\odot}$, implying a star formation rate of $\sim 2500\, \mathrm{M}_{\odot}\, \mathrm{yr}^{-1}$. 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 {\it Herschel} data, and many more are expected as additional data are collected. |
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| Domaine | : | Planète et Univers/Astrophysique/Astrophysique galactique Physique/Astrophysique/Astrophysique galactique |
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| Lien vers le texte intégral : |
| hal-00662042, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00662042 | |
| oai:hal.archives-ouvertes.fr:hal-00662042 | |
| Contributeur : Catherine Beaussier | |
| Soumis le : Lundi 23 Janvier 2012, 10:13:42 | |
| Dernière modification le : Lundi 30 Janvier 2012, 10:26:36 | |