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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
The Astrophysical journal, 09/2016, Volume: 829, Issue: 1Journal Article
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.
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