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Detection of the Far-infrared [O III] and Dust Emission in a Galaxy at Redshift 8.312: Early Metal Enrichment in the Heart of the Reionization Era
Nagoya Univ, Grad Sch Sci, Div Particle & Astrophys Sci, Nagoya, Aichi 4648602, Japan.
Osaka Sangyo Univ, Fac Design Technol, Dept Environm Sci & Technol, 3-1-1 Nakagaito, Osaka 5748530, Japan;Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan.
Osaka Sangyo Univ, Fac Design Technol, Dept Environm Sci & Technol, 3-1-1 Nakagaito, Osaka 5748530, Japan;Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.
Osaka Sangyo Univ, Fac Design Technol, Dept Environm Sci & Technol, 3-1-1 Nakagaito, Osaka 5748530, Japan.
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2019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 874, no 1, article id 27Article in journal (Refereed) Published
Abstract [en]

We present the Atacama Large Millimeter/submillimeter Array detection of the [O III] 88 mu m line and rest-frame 90 mu m dust continuum emission in a Y-dropout Lyman break galaxy (LBG), MACS0416_Y1 lying behind the Frontier Field cluster MACS J0416.1-2403. This [O III] detection confirms the LBG with a spectroscopic redshift of z = 8.3118 +/- 0.0003, making this object one of the farthest galaxies ever identified spectroscopically. The observed 850 mu m flux density of 137 +/- 26 mu Jy corresponds to a de-lensed total infrared (IR) luminosity of L-IR = (1.7 +/- 0.3) x 10(11) L-circle dot if assuming a dust temperature of T-dust = 50 K and an emissivity index of beta = 1.5, yielding a large dust mass of 4 x 10(6) M-circle dot. The ultraviolet-to-far-IR spectral energy distribution modeling where the [O III] emissivity model is incorporated suggests the presence of a young (tau(age) approximate to 4 Myr), star-forming (SFR approximate to 60 M-circle dot yr(-1)), moderately metal-polluted (Z approximate to 0.2 Z(circle dot)) stellar component with a mass of M-star = 3 x 10(8) M-circle dot. An analytic dust mass evolution model with a single episode of star formation does not reproduce the metallicity and dust mass in tau(age) approximate to 4 Myr, suggesting a pre-existing evolved stellar component with M-star similar to 3 x 10(9) M-circle dot and tau(age) similar to 0.3 Gyr as the origin of the dust mass.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 874, no 1, article id 27
Keywords [en]
dust, extinction, galaxies: formation, galaxies: high-redshift, galaxies: ISM
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-381126DOI: 10.3847/1538-4357/ab0374ISI: 000461790300001OAI: oai:DiVA.org:uu-381126DiVA, id: diva2:1302288
Funder
Swedish National Space BoardAvailable from: 2019-04-04 Created: 2019-04-04 Last updated: 2019-04-04Bibliographically approved

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Zackrisson, ErikBinggeli, Christian

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