EXTINCTION AND NEBULAR LINE PROPERTIES OF AHERSCHEL-SELECTED LENSED DUSTY STARBURST ATz= 1.027

Autor: Simon Dye, R. Shane Bussmann, Loretta Dunne, Nicholas Timmons, Stephen Anthony Eales, Julie Wardlow, Caitlin M. Casey, Asantha Cooray, Jae Calanog, Hooshang Nayyeri, Brian Ma, Elisabetta Valiante, Michał J. Michałowski, Hai Fu, Maarten Baes, Steve Maddox, Ivan Oteo, Rob Ivison, Hugo Messias, Dominik A. Riechers
Rok vydání: 2015
Předmět:
submillimeter: galaxies
EXTRACTION
Active galactic nucleus
Einstein ring
Stellar mass
Metallicity
Extinction (astronomy)
galaxies [submillimeter]
FOS: Physical sciences
SOFTWARE
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
MASS
galaxies [infrared]
infrared: galaxies
Luminosity
symbols.namesake
STAR-FORMING GALAXIES
SPECTRA
Astrophysics::Solar and Stellar Astrophysics
THAN 1.5
evolution [galaxies]
Astrophysics::Galaxy Astrophysics
Physics
SPECTROSCOPY
SUBMILLIMETER GALAXIES
Balmer series
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
observations [cosmology]
Galaxy
Physics and Astronomy
13. Climate action
Space and Planetary Science
cosmology: observations
Astrophysics of Galaxies (astro-ph.GA)
symbols
Astrophysics::Earth and Planetary Astrophysics
HIGH-REDSHIFT
galaxies: evolution
METALLICITY
Zdroj: ASTROPHYSICAL JOURNAL
Timmons, N, Cooray, A, Nayyeri, H, Casey, C, Calanog, J, Ma, B, Messias, H, Baes, M, Bussmann, R S, Dunne, L, Dye, S, Eales, S, Fu, H, Ivison, R J, Maddox, S, Michalowski, M J, Oteo, I, Riechers, D A, Valiante, E & Wardlow, J 2015, ' EXTINCTION AND NEBULAR LINE PROPERTIES OF A HERSCHEL-SELECTED LENSED DUSTY STARBURST AT z=1.027 ', Astrophysical Journal, vol. 805, no. 2, 140 . https://doi.org/10.1088/0004-637X/805/2/140
ISSN: 1538-4357
0004-637X
DOI: 10.1088/0004-637x/805/2/140
Popis: 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.
Comment: 7 pages, 8 figures, Accepted for publication in the Astrophysical Journal
Databáze: OpenAIRE
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