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A more probable explanation for a continuum flash towards a redshift ≈ 11 galaxy

The Original Article was published on 14 December 2020

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Data availability

Data used in this work are available from the Keck Observatory Archive ( with specific filenames given in Supplementary Table 1.


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C.L.S. is supported by ERC grant number 648179 ‘ConTExt’. The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant no. 140. B.M.-J. is supported in part by Independent Research Fund Denmark grant number DFF-7014-00017. J.P.U.F. acknowledges support from the Carlsberg foundation. This research has made use of the Keck Observatory Archive (KOA), which is operated by the W. M. Keck Observatory and the NASA Exoplanet Science Institute (NExScI), under contract with the National Aeronautics and Space Administration. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.

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Authors and Affiliations



C.L.S. took the lead in writing the manuscript. G.B.B. took the lead in the archival search presented in the Supplementary Information. All authors provided critical feedback and helped shape the research, analysis and manuscript.

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Correspondence to Charles Louis Steinhardt.

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The authors declare no competing interests.

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Peer review information Nature Astronomy thanks Bahram Mobasher and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary information

Supplementary Information

Supplementary Figs. 1–4 and Table 1.

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Steinhardt, C.L., Andersen, M.I., Brammer, G.B. et al. A more probable explanation for a continuum flash towards a redshift ≈ 11 galaxy. Nat Astron 5, 993–994 (2021).

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