Journal
ASTROPHYSICAL JOURNAL
Volume 779, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/779/1/67
Keywords
galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: individual; gravitational lensing: strong; submillimeter: galaxies
Categories
Funding
- Smithsonian Institution
- Academia Sinica
- National Science Foundation [AST-1009649, ANT-0638937, PHY-1125897, PHYS-1066293]
- NASA from the Space Telescope Science Institute [HST-GO-12659]
- JPL/Caltech [OT1_dmarrone_1, OT1_jvieira_4, OT2_jvieira_5]
- STFC [ST/I005544/1, ST/K003119/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K003119/1, ST/I005544/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [1125897] Funding Source: National Science Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1248097] Funding Source: National Science Foundation
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We present observations of SPT-S J053816-5030.8, a gravitationally lensed dusty star-forming galaxy (DSFG) at z = 2.7817 that was first discovered at millimeter wavelengths by the South Pole Telescope. SPT 0538-50 is typical of the brightest sources found by wide-field millimeter-wavelength surveys, being lensed by an intervening galaxy at moderate redshift (in this instance, at z = 0.441). We present a wide array of multi-wavelength spectroscopic and photometric data on SPT 0538-50, including data from ALMA, Herschel PACS and SPIRE, Hubble, Spitzer, the Very Large Telescope, ATCA, APEX, and the Submillimeter Array. We use high-resolution imaging from the Hubble Space Telescope to de-blend SPT 0538-50, separating DSFG emission from that of the foreground lens. Combined with a source model derived from ALMA imaging (which suggests a magnification factor of 21+/-4), we derive the intrinsic properties of SPT 0538-50, including the stellar mass, far-IR luminosity, star formation rate, molecular gas mass, and-using molecular line fluxes-the excitation conditions within the interstellar medium. The derived physical properties argue that we arewitnessing compact, merger-driven star formation in SPT 0538-50 similar to local starburst galaxies and unlike that seen in some other DSFGs at this epoch.
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