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

Timmons, Nicholas and Cooray, A. and Riechers, D.A. and Nayyeri, H. and Fu, Hai and Jullo, Eric and Gladders, Michael D. and Baes, Maarten and Bussmann, R.S. and Calanog, Jae and Clements, D.L. and da Cunha, E. and Dye, S. and Eales, S.A. and Furlanetto, C. and Gonzalez-Nuevo, J. and Greenslade, J. and Gurwell, M. and Messias, Hugo and Michalowski, M.J. and Oteo, I. and Pérez-Fournón, I. and Scott, Douglas and Valiante, E. (2016) Multi-wavelength lens construction of a Planck and Herschel-detected star-bursting galaxy. Astrophysical Journal, 829 (1). pp. 1-11. ISSN 1538-4357

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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 starformation rate (SFR) of 390 ± 60 M yr−1 and a stellar mass of 1.1 ± 0.4 10 x 11 M. 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 pc−2, and ~ 12 7 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.

Item Type: Article
Keywords: cosmology: observations – galaxies: evolution – infrared: galaxies – submillimeter: galaxies
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.3847/0004-637X/829/1/21
Depositing User: Eprints, Support
Date Deposited: 27 Apr 2017 10:41
Last Modified: 27 Apr 2017 11:18
URI: http://eprints.nottingham.ac.uk/id/eprint/42360

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