EXTINCTION AND NEBULAR LINE PROPERTIES OF A HERSCHEL-SELECTED LENSED DUSTY STARBURST AT z = 1.027

Nicholas Timmons; Asantha Cooray; Hooshang Nayyeri; Caitlin Casey; Jae Calanog; Brian Ma; Hugo Messias; Maarten Baes; R. Shane Bussmann; Loretta Dunne; Simon Dye; Steve Eales; Hai Fu; R. J Ivison; Steve Maddox; Michal J Michalowski; I Oteo; Dominik A Riechers; Elisabetta Valiante; Julie Wardlow

doi:10.1088/0004-637X/805/2/140

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EXTINCTION AND NEBULAR LINE PROPERTIES OF A HERSCHEL-SELECTED LENSED DUSTY STARBURST AT z = 1.027

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EXTINCTION AND NEBULAR LINE PROPERTIES OF A HERSCHEL-SELECTED LENSED DUSTY STARBURST AT z = 1.027

Nicholas Timmons, Asantha Cooray, Hooshang Nayyeri, Caitlin Casey, Jae Calanog, Brian Ma, Hugo Messias, Maarten Baes, R. Shane Bussmann, Loretta Dunne, …

The Astrophysical journal, Vol.805(2), pp.1-6

05/28/2015

DOI: 10.1088/0004-637X/805/2/140

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Abstract

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 m, resulted in detections of H + [Nii], Hβ, [Sii], and [Oiii] for the background galaxy from which we measure line fluxes and ratios. The Balmer line ratio H /Hβ of 7.5 4.4, when corrected for [Nii], results in an extinction for the starburst galaxy of . The H -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.

cosmology: observations

galaxies: evolution

infrared: galaxies

submillimeter: galaxies

Details

Title: Subtitle: EXTINCTION AND NEBULAR LINE PROPERTIES OF A HERSCHEL-SELECTED LENSED DUSTY STARBURST AT z = 1.027
Creators: Nicholas Timmons - University of California, Irvine
Asantha Cooray - University of California, Irvine
Hooshang Nayyeri - University of California, Irvine
Caitlin Casey - University of California, Irvine
Jae Calanog - University of California, Irvine
Brian Ma - University of California, Irvine
Hugo Messias - University of Lisbon
Maarten Baes - Ghent University
R. Shane Bussmann - Cornell University
Loretta Dunne - University of Edinburgh
Simon Dye - University of Nottingham
Steve Eales - Cardiff University
Hai Fu - University of Iowa
R. J Ivison - University of Edinburgh
Steve Maddox - University of Canterbury
Michal J Michalowski - Royal Observatory
I Oteo - University of Edinburgh
Dominik A Riechers - Cornell University
Elisabetta Valiante - Cardiff University
Julie Wardlow - University of Copenhagen
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.805(2), pp.1-6
DOI: 10.1088/0004-637X/805/2/140
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Institute of Physics (IOP)
Number of pages: 6
Language: English
Date published: 05/28/2015
Academic Unit: Physics and Astronomy
Record Identifier: 9984199726002771

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