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Herschel and Hubble study of a lensed massive dusty starbursting galaxy at z ∼ 3

Nayyeri, H., Cooray, A., Jullo, E., Riechers, D.A., Leung, T. K. D., Frayer, D. T. F, Gurwell, M. A., Harris, A. I., Ivison, R. J., Negrello, Mattia ORCID:, Oteo, I., Amber, S., Baker, A. J., Calanog, J., Casey, C.M., Dannerbauer, H., De Zotti, G., Eales, Stephen ORCID:, Fu, H., Michalowski, M. J., Timmons, N. and Wardlow, J. L. 2017. Herschel and Hubble study of a lensed massive dusty starbursting galaxy at z ∼ 3. Astrophysical Journal 844 (1) , 82. 10.3847/1538-4357/aa7aa0

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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 → 0) by GBT and from detection of CO(3 → 2) obtained with CARMA. We use the combined spectroscopic and imaging observations to construct a detailed model of the background dusty lensed sub-millemter galaxy (SMG) which allows us to study the source plane properties of the target. The best-fit lens model provide magnification of µstar = 2.10±0.11 and µdust = 2.02±0.06 for the stellar and dust components respectively. Multi-band data yields a magnification corrected star formation rate of 1900(±200) Myr−1 and stellar mass of 6.8+0.9−2.7 ×1011 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 time scale 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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Gravitational lensing, strong Submillimeter, galaxies
Publisher: American Astronomical Society
ISSN: 0004-637X
Date of First Compliant Deposit: 18 July 2017
Date of Acceptance: 20 June 2017
Last Modified: 21 Mar 2024 08:13

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