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

Conley, A. and Cooray, A. and Vieira, J. D. and Blain, A. and Bock, J. and Bradford, C. M. and Bridge, C. and Carpenter, J. M. and Djorgovski, S. G. and Dowell, C. D. and Fu, H. and Levenson, L. and Mahabal, A. and Murphy, E. and Nguyen, H. T. and Riechers, D. and Schulz, B. and Shupe, D. L. and Viero, M. P. and Xu, C. K. and Zemcov, M. and Zmuidzinas, J. (2011) Discovery of a Multiply Lensed Submillimeter Galaxy in Early HerMES Herschel/SPIRE Data. Astrophysical Journal Letters, 732 (2). Art. No. L35. ISSN 2041-8205.

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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 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 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) × 10^(13) 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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Cooray, A.0000-0002-3892-0190
Additional Information:© 2011 The American Astronomical Society. Received 2011 February 1; accepted 2011 April 8; published 2011 April 21. Herschel is an ESA space observatory with science instruments provided by European-led principal Investigator consortia and with important participation from NASA. SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including University of Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, University of Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, University of Sussex (UK); Caltech, JPL, NHSC, University of Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC (UK); and NASA (USA). The Submillimeter Array is a joint project between the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics. The IRAM Plateau de Bure Interferometer is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain). The National Radio Astronomy Observatory is a facility of the National Science Foundation operated by Associated Universities, Inc. Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the James S. McDonnell Foundation, the Associates of the California Institute of Technology, the University of Chicago, the states of California, Illinois, and Maryland, and the National Science Foundation. Ongoing CARMA development and operations are supported by NSF grant ATI-0838178 to CARMA, and by the CARMA partner universities. The authors thank Elisabete da Cunha for running her models for us. The Herschel data presented in this Letter will be released through the Herschel Database in Marseille, HeDaM. Facilities: Herschel (SPIRE), CSO (Z-Spec), Subaru (SuprimeCam), SMA, Hale (SWIFT), Keck:II (NIRC2), IRAM:Interferometer, ING:Newton (WFC), Spitzer (IRAC; MIPS), CARMA, VLA, GBT (Zpectrometer)
Funding AgencyGrant Number
Canadian Space Agency (CSA)UNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Ministerio de Ciencia e Innovación MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Instituto Geográfico Nacional (IGN)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Kenneth T. and Eileen L. Norris FoundationUNSPECIFIED
James S. McDonnell FoundationUNSPECIFIED
Associates of the California Institute of TechnologyUNSPECIFIED
States of CaliforniaUNSPECIFIED
State of IllinoisUNSPECIFIED
State of MarylandUNSPECIFIED
Subject Keywords:galaxies: high-redshift; galaxies: starburst; gravitational lensing: strong; submillimeter: galaxies
Classification Code:PACS: 98.54.Ep; 98.62.Sb; 98.62.Py; 95.85.Fm
Record Number:CaltechAUTHORS:20110824-083050070
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Official Citation:Discovery of a Multiply Lensed Submillimeter Galaxy in Early HerMES Herschel/SPIRE Data A. Conley et al. 2011 ApJ 732 L35
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25003
Deposited By: Ruth Sustaita
Deposited On:24 Aug 2011 16:20
Last Modified:07 Jan 2017 01:27

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