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

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

April 2011

Abstract

We report the discovery of a bright ( $f (250 m u m) > 400$ mJy), multiply-lensed submillimeter galaxy obj in {it Herschel}/SPIRE Science Demonstration Phase data from the HerMES project. Interferometric 880mum Submillimeter Array observations resolve at least four images with a large separation of $s i m 9 a r c s e c$ . A high-resolution adaptive optics $Kp $i m a g e w i t h K e c k / N I R C 2 c l e a r l y s h o w s s t r o n g l e n s i n g a r c s . F o l l o w - u p s p e c t r o s c o p y g i v e s a r e d s h i f t o f$ z=2.9575 $, a n d t h e l e n s i n g m o d e l g i v e s a t o t a l m a g n i f i c a t i o n o f$ mu sim 11 pm 1 $. T h e l a r g e i m a g e s e p a r a t i o n a l l o w s u s t o s t u d y t h e m u l t i - w a v e l e n g t h s p e c t r a l e n e r g y d i s t r i b u t i o n (S E D) o f t h e l e n s e d s o u r c e u n o b s c u r e d b y t h e c e n t r a l l e n s i n g m a s s . T h e f a r - I R / m i l l i m e t e r - w a v e S E D i s w e l l d e s c r i b e d b y a m o d i f i e d b l a c k b o d y f i t w i t h a n u n u s u a l l y w a r m d u s t t e m p e r a t u r e,$ 88 pm 3 $K . W e d e r i v e a l e n s i n g - c o r r e c t e d t o t a l I R l u m i n o s i t y o f$ (1.43 pm 0.09) times 10^{13}, mathrm{L}{odot} $, i m p l y i n g a s t a r f o r m a t i o n r a t e o f$ 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.

Type

Journal article

http://arxiv.org/abs/1104.4113v1