A dusty, normal galaxy in the epoch of reionization

Nature
Darach WatsonMichał Jerzy Michałowski

Abstract

Candidates for the modest galaxies that formed most of the stars in the early Universe, at redshifts z > 7, have been found in large numbers with extremely deep restframe-ultraviolet imaging. But it has proved difficult for existing spectrographs to characterize them using their ultraviolet light. The detailed properties of these galaxies could be measured from dust and cool gas emission at far-infrared wavelengths if the galaxies have become sufficiently enriched in dust and metals. So far, however, the most distant galaxy discovered via its ultraviolet emission and subsequently detected in dust emission is only at z = 3.2 (ref. 5), and recent results have cast doubt on whether dust and molecules can be found in typical galaxies at z ≥ 7. Here we report thermal dust emission from an archetypal early Universe star-forming galaxy, A1689-zD1. We detect its stellar continuum in spectroscopy and determine its redshift to be z = 7.5 ± 0.2 from a spectroscopic detection of the Lyman-α break. A1689-zD1 is representative of the star-forming population during the epoch of reionization, with a total star-formation rate of about 12 solar masses per year. The galaxy is highly evolved: it has a large stellar mass and is heavily enriched in ...Continue Reading

References

Sep 15, 2006·Nature·Masanori IyeKazuhiro Shimasaku
Oct 30, 2009·Nature·N R TanvirC Wolf
Apr 20, 2013·Nature·Dominik A RiechersJ Zmuidzinas
Dec 10, 2013·Nature·David B FisherKarl Gordon

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Citations

Jan 30, 2018·Science Advances·Nan LiuJianhua Wang
May 18, 2018·Nature·Takuya HashimotoNaoki Yoshida
Jan 26, 2021·Royal Society Open Science·J A Hodge, E da Cunha

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