Abstract
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. 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 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
lensed galaxy is a warm (T_dust ~ 40-65 K), hyper-luminous (L_IR ~ 1.7e13 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.