The Impact of Galaxy Overdensities and Ionized Bubbles on Lyα Emission at z∼7.0-8.5

2025/05/29 by Zuyi Chen, Daniel P. Stark, Chen, Zuyi +11
Computer Science · Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Astrophysics of Galaxies (astro-ph.GA) #Computational Physics and Python Applications #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Gamma-ray bursts and supernovae

paper · pdf · doi:10.48550/arxiv.2505.24080

openalex publication_date 2025/05/29 · openalex created_date 2025/10/14 · openalex updated_date 2026/08/02

Abstract

Lyα spectroscopy with JWST is opening a new window on the sizes of ionized bubbles through the reionization epoch. Theoretical expectations suggest typical bubble radii should be 0.6-1.5 pMpc at z≃ 7, assuming neutral hydrogen fractions of the intergalactic medium in the range x_{\rm HI}=0.5-0.7. Here we investigate this picture using JWST to characterize the environment and Lyα emission of 292 galaxies at 7.0

Citations

• Lyα visibility from z = 4.5 to 11 in the UDS field: evidence for a high neutral hydrogen fraction and small ionized bubbles at z ∼ 7
• The Lyman-α emitter bispectrum as a probe of reionization morphology
• CAPERS Observations of Two UV-Bright Galaxies at z>10. More Evidence for Bursting Star Formation in the Early Universe
• Constraints on the z∼6-13 intergalactic medium from JWST spectroscopy of Lyman-alpha damping wings in galaxies
• The Cosmic Evolution Early Release Science Survey (CEERS)
• The Cosmic Evolution Early Release Science Survey (CEERS)
• The Burstiness of Star Formation at z∼6: A Huge Diversity in the Recent Star Formation Histories of Very UV-faint Galaxies
• JADES: Measuring reionization properties using Lyman-alpha emission
• RUBIES: a complete census of the bright and red distant Universe with JWST/NIRSpec
• RUBIES Reveals a Massive Quiescent Galaxy at z=7.3
• Witnessing the onset of reionization through Lyman-α emission at redshift 13
• The density-bounded twilight of starbursts in the early Universe
• Balmer Decrement Anomalies in Galaxies at z ~ 6 Found by JWST Observations: Density-Bounded Nebulae or Excited H I Clouds?
• JWST NIRSpec Spectroscopy of the Remarkable Bright Galaxy GHZ2/GLASS-z12 at Redshift 12.34
• DeepDISC photo-z catalog for JADES DR2 GOODS-S
• The UV Continuum Slopes of Early Star-Forming Galaxies in JADES
• The Star-forming and Ionizing Properties of Dwarf z~6-9 Galaxies in JADES: Insights on Bursty Star Formation and Ionized Bubble Growth
• Inside the bubble: exploring the environments of reionisation-era Lyman-α emitting galaxies with JADES and FRESCO
• Overview of the JWST Advanced Deep Extragalactic Survey (JADES)
• Insight from JWST/NIRCam into galaxy overdensities around bright Lyα emitters during reionization: implications for ionized bubbles at z ∼ 9
• The reionising bubble size distribution around galaxies
• The JWST FRESCO Survey: Legacy NIRCam/Grism Spectroscopy and Imaging in the two GOODS Fields
• A JWST/NIRSpec First Census of Broad-Line AGNs at z=4-7: Detection of 10 Faint AGNs with M_BH~10⁶-10⁸ M_sun and Their Host Galaxy Properties
• A recently quenched galaxy 700 million years after the Big Bang
• JWST/NIRSpec Spectroscopy of z=7-9 Star Forming Galaxies with CEERS: New Insight into Bright Lyα Emitters in Ionized Bubbles
• The JWST UNCOVER Treasury survey: Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Array Programming with NumPy
• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Planck 2018 results: VI. Cosmological parameters
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• emcee: The MCMC Hammer
• Galactic Stellar and Substellar Initial Mass Function

Related

• Deep JWST spectroscopy of galaxies in a candidate ionized bubble at z = 8.7: probing reionization at pMpc scales with Lyα emission
• The reionising bubble size distribution around galaxies
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• Insight from JWST/NIRCam into galaxy overdensities around bright Lyα emitters during reionization: implications for ionized bubbles at z ∼ 9