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

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. MichałowskiN. Timmons, J. L. Wardlow

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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 by GBT and from detection of 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 o yr-1 and a stellar mass of , 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 o, 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.

Original languageEnglish
Article number82
JournalAstrophysical Journal
Volume844
Issue number1
DOIs
Publication statusPublished - 25 Jul 2017

Keywords / Materials (for Non-textual outputs)

  • gravitational lensing: strong
  • submillimeter: galaxies

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