English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present volume-averaged neutral hydrogen fractions $x_{\rm \HI}$ andionized bubble radii $R_{\rm b}$ measured with Ly$\alpha$ damping wingabsorption of galaxies at the epoch of reionization. We combine JWST/NIRSpecspectra taken by CEERS, GO-1433, DDT-2750, and JADES programs, and obtain asample containing 26 bright UV-continuum ($M_{\rm UV}<-18.5~{\rm mag}$)galaxies at $7<z<12$. We construct 4 composite spectra binned by redshift, andfind the clear evolution of softening break towards high redshift at therest-frame $1216$ {\AA}, suggesting the increase of Ly$\alpha$ damping wingabsorption. We estimate Ly$\alpha$ damping wing absorption in the galaxyspectra with realistic templates including Ly$\alpha$ emission andcircum-galactic medium absorptions. Assuming the standard inside-outreionization picture having an ionized bubble with radius $R_b$ around a galaxyembedded in the intergalactic medium with $x_{\rm \HI}$, we obtain $x_{\rm\HI}$ ($R_{\rm b}$) values generally increasing (decreasing) from $x_{\rm\HI}={0.54}^{+0.13}_{-0.54}$ to ${0.94}^{+0.06}_{-0.41}$ ($\log R_{\rmb}={1.89}^{+0.49}_{-1.54}$ to ${-0.72}^{+1.57}_{-0.28}$ comoving Mpc) atredshift $7.12^{+0.06}_{-0.08}$ to $10.28^{+1.12}_{-1.40}$. The redshiftevolution of $x_{\rm \HI}$ indicates a moderately late reionization historyconsistent with the one previously suggested from the electron scattering ofcosmic microwave background and the evolution of UV luminosity function with anescape fraction $f_{\rm esc}\sim 0.2$. Our ${R_{\rm b}}$ measurements suggestthat bubble sizes could be up to a few dex larger than the cosmic averagevalues estimated by analytic calculations for a given $x_{\rm \HI}$, while our$R_{\rm b}$ measurements are roughly comparable with the values for mergedionized bubbles around bright galaxies predicted by recent numericalsimulations.

JWST Measurements of Neutral Hydrogen Fractions and Ionized Bubble Sizes  at $z=7-12$ Obtained with Ly$\alpha$ Damping Wing Absorptions in 26 Bright  Continuum Galaxies