1202.1829 (Hai Fu et al.)

A Comprehensive View of a Strongly Lensed Planck-Associated Submillimeter Galaxy    [PDF]

Hai Fu, E. Jullo, A. Cooray, R. S. Bussmann, R. J. Ivison, I. Perez-Fournon, S. G. Djorgovski, N. Scoville, L. Yan, D. A. Riechers, J. Aguirre, R. Auld, M. Baes, A. J. Baker, M. Bradford, A. Cava, D. L. Clements, H. Dannerbauer, A. Dariush, G. De Zotti, H. Dole, L. Dunne, S. Dye, S. Eales, D. Frayer, R. Gavazzi, M. Gurwell, A. I. Harris, D. Herranz, R. Hopwood, C. Hoyos, E. Ibar, M. J. Jarvis, S. Kim, L. Leeuw, R. Lupu, S. Maddox, P. Martinez-Navajas, M. J. Michalowski, M. Negrello, A. Omont, M. Rosenman, D. Scott, S. Serjeant, I. Smail, A. M. Swinbank, E. Valiante, A. Verma, J. Vieira, J. L. Wardlow, P. van der Werf

We present high-resolution maps of stars, dust, and molecular gas in a strongly lensed submillimeter galaxy (SMG) at z = 3.259. HATLAS12--00 is selected from the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) as a strong lens candidate mainly based on its unusually high 500um flux density (~300 mJy). It is the only high-redshift Planck detection in the 130 deg^2 H-ATLAS Phase 1 area. Keck Adaptive Optics images reveal a quadruply imaged galaxy in the K-band while the Submillimeter Array and the Extended Very Large Array show doubly imaged 880um and CO(1-0) sources, indicating differentiated distributions of the various components in the galaxy. 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 emission from the stars, dust, and gas are magnified by ~17, 8, and 7 times, respectively, by four lensing galaxies at z ~ 1. Intrinsically, the galaxy is a warm (T_dust ~ 40-65 K), hyper-luminous (L_IR ~ 1.6e13 Lsun; SFR ~ 2000 Msun/yr), gas-rich (M_gas/M_baryon ~ 70%), young (M_stellar/SFR ~ 20 Myr), and short-lived (M_gas/SFR ~ 40 Myr) starburst, without a significant active galactic nucleus. With physical properties similar to unlensed z > 2 SMGs, HATLAS12--00 offers a detailed view of a typical SMG through a powerful cosmic microscope.

View original: http://arxiv.org/abs/1202.1829