Discovery of a multiply lensed submillimeter galaxy in early HerMES Herschel/SPIRE data

Discovery of a multiply lensed submillimeter galaxy in early HerMES Herschel/SPIRE data

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 separ...

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Bibliographic Details
Main Authors: Conley, A., Cooray, A., Vieira, J., Solares, E., Kim, S., Aguirre, J., Amblard, A., Auld, R., Baker, A., Beelen, A., Blain, A., Blundell, R., Bock, J., Bradford, C., Bridge, C., Brisbin, D., Burgarella, D., Carpenter, J., Chanial, P., Chapin, E., Christopher, N., Clements, D., Cox, P., Djorgovski, S., Dowell, C., Eales, S., Earle, L., Ellsworth-Bowers, T., Farrah, D., Franceschini, A., Frayer, D., Fu, H., Gavazzi, R., Glenn, J., Griffin, M., Gurwell, M., Halpern, M., Ibar, E., Ivison, R., Jarvis, M., Kamenetzky, J., Krips, M., Levenson, L., Lupu, R., Mahabal, A., Maloney, P., Maraston, C., Marchetti, L., Marsden, G., Matsuhara, H., Mortier, A., Murphy, E., Naylor, B., Neri, R., Nguyen, H., Oliver, S., Omont, A., Page, M., Papageorgiou, A., Pearson, C., Pérez-Fournon, I., Pohlen, M., Rangwala, N., Rawlings, J., Raymond, G., Riechers, D., Rodighiero, G., Roseboom, I., Rowan-Robinson, M., Schulz, B., Scott, D., Scott, K., Serra, P., Seymour, Nick, Shupe, D., Smith, A., Symeonidis, M., Tugwell, K., Vaccari, M., Valiante, E., Valtchanov, I., Verma, A., Viero, M., Vigroux, L., Wang, L., Wiebe, D., Wright, G., Xu, C.K., Zeimann, G., Zemcov, M., Zmuidzinas, J.
Format: Journal Article
Published: 2011
Online Access:http://hdl.handle.net/20.500.11937/26329
Description
Summary: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.

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