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

Timmons, Nicholas; Cooray, A.; Riechers, D.A.; Nayyeri, H.; Fu, Hai; Jullo, Eric; Gladders, Michael D.; Baes, Maarten; Bussmann, R.S.; Calanog, Jae; Clements, D.L.; da Cunha, E.; Dye, S.; Eales, S.A.; Furlanetto, C.; Gonzalez-Nuevo, J.; Greenslade, J.; Gurwell, M.; Messias, Hugo; Michalowski, M.J.; Oteo, I.; P�rez-Fourn�n, I.; Scott, Douglas; Valiante, E.

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.

Citation

Timmons, N., Cooray, A., Riechers, D., Nayyeri, H., Fu, H., Jullo, E., …Valiante, E. (2016). Multi-wavelength lens construction of a Planck and Herschel-detected star-bursting galaxy. Astrophysical Journal, 829(1), https://doi.org/10.3847/0004-637X/829/1/21

• Journal Article Type: Article
• Acceptance Date: Jul 15, 2016
• Publication Date: Sep 16, 2016
• Deposit Date: Apr 27, 2017
• Publicly Available Date: Apr 27, 2017
• Journal: Astrophysical Journal
• Print ISSN: 0004-637X
• Electronic ISSN: 1538-4357
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 829
• Issue: 1
• DOI: https://doi.org/10.3847/0004-637X/829/1/21
• Keywords: cosmology: observations – galaxies: evolution – infrared: galaxies – submillimeter: galaxies
• Public URL: https://nottingham-repository.worktribe.com/output/817419
• Publisher URL: http://iopscience.iop.org/article/10.3847/0004-637X/829/1/21/meta
• Contract Date: Apr 27, 2017