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Herschel and Hubble Study of a Lensed Massive Dusty Starbursting Galaxy at z ˜ 3

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  • H. Nayyeri
  • A. Cooray
  • E. Jullo
  • D. A. Riechers
  • T. K. D. Leung
  • D. T. Frayer
  • M. A. Gurwell
  • A. I. Harris
  • R. J. Ivison
  • M. Negrello
  • I. Oteo
  • S. Amber
  • A. J. Baker
  • J. Calanog
  • C. M. Casey
  • H. Dannerbauer
  • G. De Zotti
  • S. Eales
  • H. Fu
  • M. J. Michałowski
  • N. Timmons
Article number82
<mark>Journal publication date</mark>25/07/2017
<mark>Journal</mark>The Astrophysical Journal
Issue number1
Number of pages14
Publication StatusPublished
<mark>Original language</mark>English


We present the results of combined deep Keck/NIRC2, HST/WFC3 near-infrared, and Herschel far-infrared observations of an extremely star-forming dusty lensed galaxy identified from the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS J133542.9+300401). The galaxy is gravitationally lensed by a massive WISE-identified galaxy cluster at z ˜ 1. The lensed galaxy is spectroscopically confirmed at z = 2.685 from detection of {CO} (1\to 0) by GBT and from detection of {CO} (3\to 2) obtained with CARMA. We use the combined spectroscopic and imaging observations to construct a detailed model of the background dusty lensed submillimeter galaxy (SMG), which allows us to study the source plane properties of the target. The best-fit lens model provides magnifications of μ star = 2.10 ± 0.11 and μ dust = 2.02 ± 0.06 for the stellar and dust components, respectively. Multiband data yield a magnification-corrected star formation rate of 1900(±200) M ⊙ yr-1 and a stellar mass of {6.8}-2.7+0.9× {10}11 {M}⊙ , consistent with a main sequence of star formation at z ˜ 2.6. The CO observations yield a molecular gas mass of 8.3(±1.0) × 1010 M ⊙, similar to the most massive star-forming galaxies, which together with the high star formation efficiency, are responsible for the intense observed star formation rates. The lensed SMG has a very short gas depletion timescale of ˜40 Myr. The high stellar mass and small gas fractions observed indicate that the lensed SMG likely has already formed most of its stellar mass and could be a progenitor of the most massive elliptical galaxies found in the local universe. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

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© 2017. The American Astronomical Society. All rights reserved.