The Universe is at Most 88% Neutral at z=10.6

Abstract

Recent observations of GN-z11 with JWST have revealed a Ly$\alpha$ emission line with an equivalent width of 18$\pm 2$ angstroms. At z=10.6, this galaxy is expected to lie in the heart of reionization. We use a series of inhomogeneous reionization simulations to derive the distribution of the Ly$\alpha$ EW after traveling through the neutral intergalactic medium with varying average neutral gas fraction, $x_{HI}$. We use these distribution to place an upper limit of $x_{HI}<$ 0.88 at z=10.6 at 95% confidence level. We compare our upper limit to different reionization history models, which include the recently identified enhancement at the bright end of the luminosity function at z>8. We find that models in which faint galaxies have higher escape fraction compared to bright galaxies are favored by the new data.

7 pages, 3 figures

References in corpus (17)

• The NumPy array: a structure for efficient numerical computation
• A Comprehensive Study on Galaxies at z~9-16 Found in the Early JWST Data: UV Luminosity Functions and Cosmic Star-Formation History at the Pre-Reionization Epoch
• CEERS Key Paper I: An Early Look into the First 500 Myr of Galaxy Formation with JWST
• Model-independent evidence in favor of an end to reionization by z~6
• Efficient Simulations of Early Structure Formation and Reionization
• Conditions for Reionizing the Universe with A Low Galaxy Ionizing Photon Escape Fraction
• Lyman Alpha Emitting Galaxies as a Probe of Reionization
• Inferences on the Timeline of Reionization at z~8 From the KMOS Lens-Amplified Spectroscopic Survey
• Constraining the neutral fraction of hydrogen in the IGM at redshift 7.5
• First look with JWST spectroscopy: $z\sim 8$ galaxies resemble local analogues
• Lyman-alpha emitters gone missing: evidence for late reionization?
• A VLT/FORS2 view at $z\sim 6$: Lyman-$\alpha$ emitter fraction and galaxy physical properties at the edge of the epoch of cosmic reionization
• The MUSE Hubble Ultra Deep Field Survey X. Ly$\alpha$ Equivalent Widths at $2.9<z<6.6$
• LAGER Ly$\alpha$ Luminosity Function at $z\sim 7$, Implications for Reionization
• The Magellan M2FS Spectroscopic Survey of High-$z$ Galaxies: Lyα Emitters at $z\approx 6.6$ and the Evolution of Lyα Luminosity Function over $z\approx 5.7-6.6$
• An Hα Impression of Lyα Galaxies at $z\simeq 6$ with Deep JWST/NIRCam Imaging
• CHORUS IV: Mapping the Spatially Inhomogeneous Cosmic Reionization with Subaru HSC

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