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Dust in the Reionization Era: ALMA Observations of a z=8.38 Gravitationally Lensed Galaxy

Laporte, N; Ellis, RS; Boone, F; Bauer, FE; Quenard, D; Roberts-Borsani, GW; Pello, R; ... Streblyanska, A; + view all (2017) Dust in the Reionization Era: ALMA Observations of a z=8.38 Gravitationally Lensed Galaxy. Astrophysical Journal Letters , 837 (2) , Article L21. 10.3847/2041-8213/aa62aa. Green open access

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Abstract

We report on the detailed analysis of a gravitationally lensed Y-band dropout, A2744_YD4, selected from deep Hubble Space Telescope imaging in the Frontier Field cluster Abell 2744. Band 7 observations with the Atacama Large Millimeter/submillimeter Array (ALMA) indicate the proximate detection of a significant 1 mm continuum flux suggesting the presence of dust for a star-forming galaxy with a photometric redshift of z\simeq 8. Deep X-SHOOTER spectra confirms the high-redshift identity of A2744_YD4 via the detection of Lyα emission at a redshift z = 8.38. The association with the ALMA detection is confirmed by the presence of [O iii] 88 μm emission at the same redshift. Although both emission features are only significant at the 4σ level, we argue their joint detection and the positional coincidence with a high-redshift dropout in the Hubble Space Telescope images confirms the physical association. Analysis of the available photometric data and the modest gravitational magnification (\mu \simeq 2) indicates A2744_YD4 has a stellar mass of ~2 × 109 {M}_{\odot }, a star formation rate of ~20 {M}_{\odot } yr−1 and a dust mass of ~6 × 106 {M}_{\odot }. We discuss the implications of the formation of such a dust mass only \simeq 200\,\mathrm{Myr} after the onset of cosmic reionization.

Type: Article
Title: Dust in the Reionization Era: ALMA Observations of a z=8.38 Gravitationally Lensed Galaxy
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/2041-8213/aa62aa
Publisher version: http://doi.org/10.3847/2041-8213/aa62aa
Language: English
Additional information: This version is the version of record [delete as appropriate]. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Early universe; galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: star formation; submillimeter: galaxies
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1559491
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