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 (T dust ~ 40-65 K), hyper-luminous (L IR ~
1.7 × 1013 L &sun; star formation rate
(SFR) ~2000 M &sun; yr-1), gas-rich (M
gas/M baryon ~ 70%), young (M
stellar/SFR ~ 20 Myr), and short-lived (M gas/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.
Original language | English |
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Article number | 134 |
Journal | Astrophysical Journal |
Volume | 753 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Jul 2012 |
Keywords / Materials (for Non-textual outputs)
- galaxies: formation
- galaxies: individual (HATLAS J114637.9–001132)
- galaxies: interactions