MULTI-WAVELENGTH LENS RECONSTRUCTION OF A PLANCK AND HERSCHEL-DETECTED STAR-BURSTING GALAXY

• Published in: The Astrophysical journal Vol. 829; no. 1; pp. 21 - 31
• Main Authors: Timmons, Nicholas, Cooray, Asantha, Riechers, Dominik A., Nayyeri, Hooshang, Fu, Hai, Jullo, Eric, Gladders, Michael D., Baes, Maarten, Bussmann, R. Shane, Calanog, Jae, Clements, David L., Cunha, Elisabete da, Dye, Simon, Eales, Stephen A., Furlanetto, Cristina, Gonzalez-Nuevo, Joaquin, Greenslade, Joshua, Gurwell, Mark, Messias, Hugo, Micha owski, Micha J., Oteo, Iván, Pérez-Fournon, Ismael, Scott, Douglas, Valiante, Elisabetta
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 20.09.2016; IOP Publishing; American Astronomical Society
• Subjects: Astrophysics; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; COSMIC DUST; COSMOLOGY; cosmology: observations; DENSITY; Dust; Dust emission; EMISSION; ENERGY SPECTRA; FLUX DENSITY; Galactic clusters; GALACTIC EVOLUTION; GALAXIES; galaxies: evolution; GALAXY CLUSTERS; GRAVITATIONAL LENSES; infrared: galaxies; Lenses; MASS; Molecular gases; Physical properties; Physics; Reconstruction; RED SHIFT; Star formation; STARS; Stars & galaxies; Stellar mass; submillimeter: galaxies; WAVELENGTHS
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/0004-637X/829/1/21

ABSTRACT 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 yr−1 and a stellar mass of . 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 pc−2, and M yr−1 kpc−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.