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

Journal Article · Thu Jul 20 04:00:00 EDT 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA7AA0· OSTI ID:22875987

Nayyeri, H.; Cooray, A. ^[1]; Jullo, E. ^[2]; Riechers, D. A.; Leung, T. K. D. ^[3]; Frayer, D. T. ^[4]; Gurwell, M. A. ^[5]; Harris, A. I. ^[6]; Ivison, R. J.; Oteo, I. ^[7]; Negrello, M. ^[8]; Amber, S. ^[9]; Baker, A. J. ^[10]; Calanog, J. ^[11]; Casey, C. M. ^[12]; Dannerbauer, H. ^[13]; De Zotti, G. ^[14]; Eales, S. ^[15]; others, and

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1. Department of Physics and Astronomy, University of California Irvine, Irvine, CA (United States)
2. Laboratoire d’Astrophysique de Marseille, Pôle de l’Étoile Site de Château-Gombert 38, rue Frédéric Joliot-Curie F-13388 Marseille cedex 13 (France)
3. Department of Astronomy, Cornell University, Ithaca, NY, 14853 (United States)
4. National Radio Astronomy Observatory, Green Bank, WV, 24944 (United States)
5. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., MS 42, Cambridge, MA 02138 (United States)
6. Department of Astronomy University of Maryland College Park, MD 20742 (United States)
7. European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching (Germany)
8. School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA (United Kingdom)
9. Department of Physical Sciences, The Open University, Milton Keynes, MK7 6AA (United Kingdom)
10. Department of Physics and Astronomy, Rutgers, the State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019 (United States)
11. Department of Physical Sciences, San Diego Miramar College, San Diego CA, 92126 (United States)
12. Department of Astronomy, University of Texas at Austin, RLM 16.218 2515 Speedway, Stop C1400, Austin, TX 78712-1205 (United States)
13. Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife (Spain)
14. INAF-Osservatorio Astronomico di Padova, I-35122 Padova (Italy)
15. School of Physics and Astronomy, Cardiff University, Cardiff (United Kingdom)

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 submillimeter galaxy (SMG), which allows us to study the source plane properties of the target. The best-fit lens model provides magnifications of μ {sub star} = 2.10 ± 0.11 and μ {sub 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 {sub ⊙} yr{sup −1} and a stellar mass of 6.8{sub −2.7}{sup +0.9}×10{sup 11} M{sub ⊙}, 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) × 10{sup 10} M {sub ⊙}, 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.

• OSTI ID: 22875987
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 844; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTROPHYSICS
CARBON MONOXIDE
COSMIC DUST
DETECTION
EFFICIENCY
GALAXIES
GALAXY CLUSTERS
GRAVITATIONAL LENSES
MASS
STARS
UNIVERSE