A Remarkably Luminous Galaxy at z=11.1 Measured with Hubble Space Telescope Grism Spectroscopy

Abstract

We present Hubble WFC3/IR slitless grism spectra of a remarkably bright $z\gtrsim 10$ galaxy candidate, GN-z11, identified initially from CANDELS/GOODS-N imaging data. A significant spectroscopic continuum break is detected at $\lambda =1.47\pm 0.01\mu$m. 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 Ly$\alpha$ break redshifted to $z_{\mathrm{grism}}=11.09_{-0.12}^{+0.08}$, just $\sim$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 at z>10. GN-z11 is remarkably and unexpectedly luminous for a galaxy at such an early time: its UV luminosity is 3x larger than L* measured at z~6-8. The Spitzer IRAC detections up to 4.5 $\mu$m of this galaxy are consistent with a stellar mass of $\sim 10^9{M}_{\odot }$. This spectroscopic redshift measurement suggests that the James Webb Space Telescope (JWST) will be able to similarly and easily confirm such sources at z>10 and characterize their physical properties through detailed spectroscopy. Furthermore, WFIRST, with its wide-field near-IR imaging, would find large numbers of similar galaxies and contribute greatly to JWST's spectroscopy, if it is launched early enough to overlap with JWST.

arXiv comment12 pages, 11 figures, accepted for publication in ApJ

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• Mysteries of Capotauro: investigating the puzzling nature of an extreme F356W-dropout
• Dark-ages Reionization and Galaxy Formation Simulation - XV. Stellar evolution and feedback in dwarf galaxies at high redshift
• Galaxies into the Dark Ages
• Galaxy formation from a timescale perspective
• A Multiply-Imaged z $\sim$ 6.3 Lyman Alpha Emitter candidate behind Abell 2261
• One of Everything: The Breakthrough Listen Exotica Catalog
• Dark-ages Reionization and Galaxy Formation Simulation - XIV. Gas accretion, cooling and star formation in dwarf galaxies at high redshift
• An optically-dark merging system at z~6 detected by JWST
• Default Parallels: The Science Potential Of JWST Parallel Observations During TSO Primary Observations
• Leonessa: An Extremely Metal-poor Galaxy Undergoing Secular Chemical Evolution
• Near-IR narrow-band imaging with CIRCE at the Gran Telescopio Canarias: Searching for Ly$\alpha$-emitters at $z\sim 9.3$
• Considering light-matter interactions in the Friedmann equations
• The AGORA High-resolution Galaxy Simulations Comparison Project. X: Formation and Evolution of Galaxies at the High-redshift Frontier
• Redshift Horizon for Detecting the First Galaxies in Far-Infared Surveys
• Dark matter effect attributed to the inherent structure of cosmic space
• Low redshift constraints on scale-covariant models
• On the possibility of Baryon Acoustic Oscillation measurements at redshift $z>7.6$ with the Roman Space Telescope
• GN-z11-flash was a signal from a man-made satellite not a gamma-ray burst at redshift 11
• Faint Galaxy Number Counts in the Durhamand SDSS Catalogues
• Nitrogen enhancement of GN-z11 by metal pollution from supermassive stars
• MIRI spectrophotometry of GN-z11: Detection and nature of an optical red continuum component
• HST WFC3/Grism Observations of the Candidate Ultra-High-Redshift Radio Galaxy GLEAM J0917-0012
• The energy conditions and model selection in the local Universe
• Direct detection of cool molecular gas in a star-forming galaxy at $z=7.31$
• Early galaxy evolution: The complex interstellar medium distribution of the z~7 galaxy A1689-zD1
• Where is Population II?
• Lorentzian correction for the evolution of the CMB temperature
• The imprint of gas on gravitational waves from LISA intermediate-mass black hole binaries
• Cosmology, astrobiology, and the RNA world. Just add quintessential water
• First Light: Switching on Stars at the Dawn of Time
• A Comprehensive JWST/NIRSpec Census of Broad-line Active Galactic Nuclei: Faint, Low-mass Accretors and a Population of Little Red Dots
• The Nature of High-Redshift Massive Quiescent Galaxies -- Searching for RUBIES-UDS-QG-z7 in FLARES
• The BUFFALO HST Survey
• The FLARE mission: Deep and Wide-field 1-5$\mu$m Imaging and Spectroscopy for the Early Universe: a proposal for M5 Cosmic Vision call
• The AGEL Survey: Spectroscopic Confirmation of Strong Gravitational Lenses in the DES and DECaLS Fields Selected Using Convolutional Neural Networks
• Finding High-Redshift Galaxies with JWST
• GalSBI-SPS: a stellar population synthesis-based galaxy population model for cosmology and galaxy evolution applications
• Astro2020 Science White Paper: Exploration and characterization of the earliest epoch of galaxy formation: beyond the re-ionization era