Journal article

A REMARKABLY LUMINOUS GALAXY AT Z=11.1 MEASURED WITH HUBBLE SPACE TELESCOPE GRISM SPECTROSCOPY

PA Oesch, G Brammer, PG van Dokkum, GD Illingworth, RJ Bouwens, I Labbe, M Franx, I Momcheva, MLN Ashby, GG Fazio, V Gonzalez, B Holden, D Magee, RE Skelton, R Smit, LR Spitler, M Trenti, SP Willner

ASTROPHYSICAL JOURNAL | IOP PUBLISHING LTD | Published : 2016

Abstract

We present Hubble WFC3/IR slitless grism spectra of a remarkably bright z ≥ 10 galaxy candidate, GN-z11, identified initially from CANDELS/GOODS-N imaging data. A significant spectroscopic continuum break is detected at . The new grism data, combined with the photometric data, rule out all plausible lower redshift solutions for this source. The only viable solution is that this continuum break is the Lyα break redshifted to , just ∼400 Myr after the Big Bang. This observation extends the current spectroscopic frontier by 150 Myr to well before the Planck (instantaneous) cosmic reionization peak at z ∼ 8.8, demonstrating that galaxy build-up was well underway early in the reionization epoch a..

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University of Melbourne Researchers

Grants

Awarded by NASA


Funding Acknowledgements

We thank the anonymous referee for a helpful report, which greatly improved this manuscript. The primary data for this work were obtained with the Hubble Space Telescope operated by AURA, Inc. for NASA under contract NAS5-26555. Furthermore, this work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. This work is supported by NASA grant HST-GO-13871.