Extinction and nebular line properties of a Herschel-selected lensed dusty starburst at z = 1.027

Timmons, Nicholas, Cooray, Asantha, Nayyeri, Hooshang, Casey, Caitlin, Calanog, Jae, Ma, Brian, Messias, Hugo, Baes, Maarten, Bussmann, R. Shane, Dunne, Loretta, Dye, S., Eales, Steve, Fu, Hai, Ivison, R.J., Maddox, Steve, Michałowski, Michał J., Oteo, I., Riechers, Dominik A., Valiante, Elisabetta and Wardlow, Julie (2015) Extinction and nebular line properties of a Herschel-selected lensed dusty starburst at z = 1.027. Astrophysical Journal, 805 (2). 140/1-140/6. ISSN 1538-4357

Full text not available from this repository.


We present Hubble Space Telescope Wide Field Camera 3 (WFC3) imaging and grism spectroscopy observations of the Herschel-selected gravitationally lensed starburst galaxy HATLASJ1429-0028. The lensing system consists of an edge-on foreground disk galaxy at z = 0.218 with a nearly complete Einstein ring of the infrared luminous galaxy at z = 1.027. The WFC3 spectroscopy with G102 and G141 grisms, covering the wavelength range of 0.8–1.7 μm, resulted in detections of Hα + [Nii], Hβ, [Sii], and [Oiii] for the background galaxy from which we measure line fluxes and ratios. The Balmer line ratio Hα/Hβ of 7.5 ± 4.4, when corrected for [Nii], results in an extinction for the starburst galaxy of . The Hα-based star formation rate (SFR), when corrected for extinction, is 60 ± 50 yr−1, lower than the instantaneous SFR of 390 ± 90 yr−1 from the total IR luminosity. We also compare the nebular line ratios of HATLASJ1429-0028 with other star-forming and sub-millimeter bright galaxies. The nebular line ratios are consistent with an intrinsic ultra-luminous infrared galaxy with no evidence for excitation by an active galactic nucleus (AGN). We estimate the metallicity, 12 + log(O/H), of HATLASJ1429-0028 to be 8.49 ± 0.16. Such a low value is below the average relation for stellar mass versus metallicity of galaxies at for a galaxy with a stellar mass of . The combination of high stellar mass, the lack of AGN indicators, low metallicity, and the high SFR of HATLASJ1429-0028 suggest that this galaxy is currently undergoing a rapid formation.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/751156
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: https://doi.org/10.1088/0004-637X/805/2/140
Depositing User: Eprints, Support
Date Deposited: 27 Apr 2017 10:44
Last Modified: 04 May 2020 17:07
URI: https://eprints.nottingham.ac.uk/id/eprint/42362

Actions (Archive Staff Only)

Edit View Edit View