Bibcode
Nayyeri, H.; Cooray, A.; Jullo, E.; Riechers, D. A.; Leung, T. K. D.; Frayer, D. T.; Gurwell, M. A.; Harris, A. I.; Ivison, R. J.; Negrello, M.; Oteo, I.; Amber, S.; Baker, A. J.; Calanog, J.; Casey, C. M.; Dannerbauer, H.; De Zotti, G.; Eales, S.; Fu, H.; Michałowski, M. J.; Timmons, N.; Wardlow, J. L.
Bibliographical reference
The Astrophysical Journal, Volume 844, Issue 1, article id. 82, 14 pp. (2017).
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2017
Journal
Citations
14
Refereed citations
13
Description
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.
Related projects
Molecular Gas and Dust in Galaxies Across Cosmic Time
Two of the most fundamental questions in astrophysics are the conversion of molecular gas into stars and how this physical process is a function of environments on all scales, ranging from planetary systems, stellar clusters, galaxies to galaxy clusters. The main goal of this internal project is to get insight into the formation and evolution of
Helmut
Dannerbauer