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: https://orcid.org/0000-0002-7925-7663, Oteo, I., Amber, S., Baker, A. J., Calanog, J., Casey, C.M., Dannerbauer, H., De Zotti, G., Eales, Stephen ORCID: https://orcid.org/0000-0002-7394-426X, 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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Abstract
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: | 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: | 11 Nov 2024 04:15 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/102550 |
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