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

Abstract

We present Hubble Space Telescope (HST) WFC3 imaging and grism spectroscopy observations of the {\it 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 to 1.7 $\mu$m, resulted in detections of H$\alpha$+[NII], H$\beta$, [SII], and [OIII] for the background galaxy from which we measure line fluxes and ratios. The Balmer line ratio H$\alpha$/H$\beta$ of $7.5\pm 4.4$, when corrected for [NII], results in an extinction for the starburst galaxy of $E(B-V)=0.8\pm 0.5$. The $H\alpha$ based star-formation rate, when corrected for extinction, is $60\pm 50$ M${}_{\odot }$ yr${}^{-1}$, lower than the instantaneous star-formation rate of 390 $\pm$ 90 M${}_{\odot }$ yr${}^{-1}$ from the total IR luminosity. We also compare the nebular line ratios of HATLASJ1429-0028 with other star-forming and sub-mm 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 $\pm$ 0.16. Such a low value is below the average relations for stellar mass vs. metallicity of galaxies at $z\sim 1$ for a galaxy with stellar mass of $\sim 2\times 10^{11}$ M${}_{\odot }$. The combination of high stellar mass, lack of AGN indicators, low metallicity, and the high star-formation rate of HATLASJ1429-0028 suggest that this galaxy is currently undergoing a rapid formation.

arXiv comment7 pages, 8 figures, Accepted for publication in the Astrophysical Journal

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Cited by in corpus (8)

• Candidate Gravitationally Lensed Dusty Star-forming Galaxies in the Herschel Wide Area Surveys
• Candidate high-z proto-clusters among the Planck compact sources, as revealed by Herschel-SPIRE
• Ultra-bright CO and [CI] emission in a lensed z=2.04 submillimeter galaxy with extreme molecular gas properties
• Herschel and Hubble study of a lensed massive dusty starbursting galaxy at $z\sim 3$
• Multi-wavelength lens reconstruction of a $\text{Planck}$ $\&$ $\text{Herschel}$-detected star-bursting galaxy
• Massive molecular gas reservoir in a luminous sub-millimeter galaxy during cosmic noon
• SOFIA/HAWC+ detection of a gravitationally lensed starburst galaxy at $z$ = 1.03
• The molecular-gas properties in the gravitationally lensed merger HATLAS J142935.3-002836