A comprehensive view of a strongly lensed Planck-associated submillimeter galaxy

Fu, Hai; Jullo, E.; Cooray, A.; Bussmann, R. S.; Ivison, R. J.; Pérez-Fournon, I.; Djorgovski, S. G.; Scoville, N.; Yan, L.; Riechers, D. A.; Aguirre, J.; Auld, R.; Baes, M.; Baker, A. J.; Bradford, M.; Cava, A.; Clements, D. L.; Dannerbauer, H.; Dariush, A.; De Zotti, G.; Dole, H.; Dunne, L.; Dye, S.; Eales, S.; Frayer, D.; Gavazzi, R.; Gurwell, M.; Harris, A. I.; Herranz, D.; Hopwood, R.; Hoyos, C.; Ibar, E.; Jarvis, M. J.; Kim, S.; Leeuw, L.; Lupu, R.; Maddox, S.; Martínez-Navajas, P.; Michałowski, M. J.; Negrello, M.; Omont, A.; Rosenman, M.; Scott, D.; Serjeant, S.; Smail, I.; Swinbank, A. M.; Valiante, E.; Verma, A.; Vieira, J.; Wardlow, J. L. and van der Werf, P. (2012). A comprehensive view of a strongly lensed Planck-associated submillimeter galaxy. Astrophysical Journal, 753(2) p. 134.

DOI: https://doi.org/10.1088/0004-637X/753/2/134

Abstract

We present high-resolution maps of stars, dust, and molecular gas in a strongly lensed submillimeter galaxy (SMG) at z = 3.259. HATLAS J114637.9–001132 is selected from the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) as a strong lens candidate mainly based on its unusually high 500 μm flux density (~300 mJy). It is the only high-redshift Planck detection in the 130 deg2 H-ATLAS Phase-I area. Keck Adaptive Optics images reveal a quadruply imaged galaxy in the K band while the Submillimeter Array and the Jansky Very Large Array show doubly imaged 880 μm and CO(1→0) sources, indicating differentiated distributions of the various components in the galaxy. In the source plane, the stars reside in three major kpc-scale clumps extended over ~1.6 kpc, the dust in a compact (~1 kpc) region ~3 kpc north of the stars, and the cold molecular gas in an extended (~7 kpc) disk ~5 kpc northeast of the stars. The emissions from the stars, dust, and gas are magnified by ~17, ~8, and ~7 times, respectively, by four lensing galaxies at z ~ 1. Intrinsically, the lensed galaxy is a warm (Tdust ~ 40-65 K), hyper-luminous (LIR ~ 1.7 × 1013 L☉; star formation rate (SFR) ~2000 M☉ yr–1), gas-rich (Mgas/Mbaryon ~ 70%), young (Mstellar/SFR ~ 20 Myr), and short-lived (Mgas/SFR ~ 40 Myr) starburst. With physical properties similar to unlensed z > 2 SMGs, HATLAS J114637.9–001132 offers a detailed view of a typical SMG through a powerful cosmic microscope.

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