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2011ApJ...732L..35C - Astrophys. J., 732, L35 (2011/May-2)

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

CONLEY A., COORAY A., VIEIRA J.D., GONZALEZ SOLARES E.A., KIM S., AGUIRRE J.E., AMBLARD A., AULD R., BAKER A.J., BEELEN A., BLAIN A., BLUNDELL R., BOCK J., BRADFORD C.M., BRIDGE C., BRISBIN D., BURGARELLA D., CARPENTER J.M., CHANIAL P., CHAPIN E., CHRISTOPHER N., CLEMENTS D.L., COX P., DJORGOVSKI S.G., DOWELL C.D., EALES S., EARLE L., ELLSWORTH-BOWERS T.P., FARRAH D., FRANCESCHINI A., FRAYER D., FU H., GAVAZZI R., GLENN J., GRIFFIN M., GURWELL M.A., HALPERN M., IBAR E., IVISON R.J., JARVIS M., KAMENETZKY J., KRIPS M., LEVENSON L., LUPU R., MAHABAL A., MALONEY P.D., MARASTON C., MARCHETTI L., MARSDEN G., MATSUHARA H., MORTIER A.M.J., MURPHY E., NAYLOR B.J., NERI R., NGUYEN H.T., OLIVER S.J., OMONT A., PAGE M.J., PAPAGEORGIOU A., PEARSON C.P., PEREZ-FOURNON I., POHLEN M., RANGWALA N., RAWLINGS J.I., RAYMOND G., RIECHERS D., RODIGHIERO G., ROSEBOOM I.G., ROWAN-ROBINSON M., SCHULZ B., SCOTT D., SCOTT K., SERRA P., SEYMOUR N., SHUPE D.L., SMITH A.J., SYMEONIDIS M., TUGWELL K.E., VACCARI M., VALIANTE E., VALTCHANOV I., VERMA A., VIERO M.P., VIGROUX L., WANG L., WIEBE D., WRIGHT G., XU C.K., ZEIMANN G., ZEMCOV M. and ZMUIDZINAS J.

Abstract (from CDS):

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)x1013 L☉, implying a star formation rate of ∼2500 M☉/yr. 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.

Abstract Copyright: ∼

Journal keyword(s): galaxies: high-redshift - galaxies: starburst - gravitational lensing: strong - submillimeter: galaxies

Nomenclature: Text: [CCV2011] HLSW-01 N=1. Fig. 1: [CCV2011] HLSW-01 N (Nos 1-4).

Simbad objects: 4

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