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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; Wardlow, Julie

Authors

Nicholas Timmons

Asantha Cooray

Hooshang Nayyeri

Caitlin Casey

Jae Calanog

Brian Ma

Hugo Messias

Maarten Baes

R. Shane Bussmann

Loretta Dunne

S. Dye

Steve Eales

Hai Fu

R.J. Ivison

Steve Maddox

Michał J. Michałowski

I. Oteo

Dominik A. Riechers

Elisabetta Valiante

Julie Wardlow



Abstract

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.

Journal Article Type Article
Publication Date May 28, 2015
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 805
Issue 2
Article Number 140
APA6 Citation Timmons, N., Cooray, A., Nayyeri, H., Casey, C., Calanog, J., Ma, B., …Wardlow, J. (2015). Extinction and nebular line properties of a Herschel-selected lensed dusty starburst at z = 1.027. Astrophysical Journal, 805(2), https://doi.org/10.1088/0004-637X/805/2/140
DOI https://doi.org/10.1088/0004-637X/805/2/140
Keywords cosmology: observations; galaxies: evolution; infrared: galaxies; submillimeter: galaxies
Publisher URL http://iopscience.iop.org/article/10.1088/0004-637X/805/2/140/meta
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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