Multi-wavelength lens reconstruction of a Planck and Herschel-detected star-bursting galaxy

Journal Article · Tue Sep 20 04:00:00 EDT 2016 · Astrophysical Journal

DOI:https://doi.org/10.3847/0004-637X/829/1/21· OSTI ID:22868685

Timmons, Nicholas; Cooray, Asantha; Nayyeri, Hooshang ^[1]; Riechers, Dominik A.; Bussmann, R. Shane ^[2]; Fu, Hai ^[3]; Jullo, Eric ^[4]; Gladders, Michael D. ^[5]; Baes, Maarten ^[6]; Calanog, Jae ^[7]; Clements, David L.; Greenslade, Joshua ^[8]; Cunha, Elisabete da ^[9]; Dye, Simon; Furlanetto, Cristina ^[10]; Eales, Stephen A. ^[11]; Gonzalez-Nuevo, Joaquin ^[12]; Gurwell, Mark ^[13]; others, and

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1. Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)
2. Department of Astronomy, Cornell University, Ithaca, NY 14853 (United States)
3. Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242 (United States)
4. Aix-Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 38 rue Joliot-Curie, F-13388 Marseille Cedex (France)
5. The Department of Astronomy and Astrophysics, and the Kavli Institute for Cosmological Physics, The University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
6. Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281S9, B-9000 Gent (Belgium)
7. Department of Physical Sciences, San Diego Miramar College, San Diego, CA 92126 (United States)
8. Physics Department, Blackett Lab, Imperial College, Prince Consort Road, London SW7 2AZ (United Kingdom)
9. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122 (Australia)
10. School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham, NG7 2RD (United Kingdom)
11. School of Physics and Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff CF24 3AA (United Kingdom)
12. Departamento de Fısica, Universidad de Oviedo, C. Calvo Sotelo s/n, E-33007 Oviedo (Spain)
13. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

We present a source-plane reconstruction of a Herschel and Planck-detected gravitationally lensed dusty star-forming galaxy (DSFG) at z = 1.68 using Hubble, Submillimeter Array (SMA), and Keck observations. The background submillimeter galaxy (SMG) is strongly lensed by a foreground galaxy cluster at z = 0.997 and appears as an arc with a length of ∼15″ in the optical images. The continuum dust emission, as seen by SMA, is limited to a single knot within this arc. We present a lens model with source-plane reconstructions at several wavelengths to show the difference in magnification between the stars and dust, and highlight the importance of multi-wavelength lens models for studies involving lensed DSFGs. We estimate the physical properties of the galaxy by fitting the flux densities to model spectral energy distributions leading to a magnification-corrected star-formation rate (SFR) of 390 ± 60 M {sub ⊙} yr{sup −1} and a stellar mass of 1.1±0.4×10{sup 11} M{sub ⊙}. These values are consistent with high-redshift massive galaxies that have formed most of their stars already. The estimated gas-to-baryon fraction, molecular gas surface density, and SFR surface density have values of 0.43 ± 0.13, 350 ± 200 M{sub ⊙} pc{sup −2}, and ∼12±7 M {sub ⊙} yr{sup −1} kpc{sup −2}, respectively. The ratio of SFR surface density to molecular gas surface density puts this among the most star-forming systems, similar to other measured SMGs and local ULIRGs.

• OSTI ID: 22868685
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 829; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BARYONS
COSMIC DUST
COSMOLOGY
DENSITY
EMISSION
ENERGY SPECTRA
FLUX DENSITY
GALACTIC EVOLUTION
GALAXIES
GALAXY CLUSTERS
GRAVITATIONAL LENSES
MASS
RED SHIFT
STARS
WAVELENGTHS