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arXiv · 2211.13620

An Hα Impression of Lyα Galaxies at $z\simeq6$ with Deep JWST/NIRCam Imaging

Yuanhang Ning·Zheng Cai·Linhua Jiang·Xiaojing Lin·Shuqi Fu·Daniele Spinoso
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Abstract

We present a study of seven spectroscopically confirmed (Ly$α$ emitting) galaxies at redshift $z\simeq6$ using the $JWST$/NIRCam imaging data. These galaxies, with a wide range of Ly$α$ luminosities, were recently observed in a series of NIRCam broad- and medium-bands. We constrain the rest-frame UV/optical continua and measure the H$α$ line emission of the galaxies using the combination of the $JWST$/NIRCam and archival $HST$/WFC3 infrared photometry. We further estimate their escape fractions of Ly$α$ photons ($f_{\rm esc}^{\rm Lyα}$) and the production efficiency of ionizing photons ($ξ_{\rm ion}$). Among the sample, 6/7 galaxies have Ly$α$ escape fractions of ${\lesssim}10\%$, which might be the status for most of star-forming galaxies at $z\simeq6$. One UV-faint Ly$α$ galaxy with an extremely blue UV slope owns a large value of $f_{\rm esc}^{\rm Lyα}$ reaching ${\simeq}50\%$. These galaxies spread a broad range of $ξ_{\rm ion}$ over log$_{10}$ $ξ_{\rm ion, 0}$ (Hz erg$^{-1}$) $\sim25.0-26.5$. We find that UV-fainter galaxies with bluer UV continuum slopes likely have higher escape fractions of Ly$α$ photons. We also find that galaxies with higher Ly$α$ line emission tend to produce ionizing photons more efficiently. The most Ly$α$-luminous galaxy in the sample has a very high $ξ_{\rm ion, 0}$ of log$_{10}$ $ξ_{\rm ion, 0}$ (Hz erg$^{-1}$) $>26$. Our results support that Ly$α$ galaxies may have served as an important contributor to the cosmic reionization. Blue and bright Ly$α$ galaxies are excellent targets for $JWST$ follow-up spectroscopic observations.

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Yuanhang Ning, Zheng Cai, Linhua Jiang, Xiaojing Lin, Shuqi Fu, Daniele Spinoso. 2023-01-15. An Hα Impression of Lyα Galaxies at $z\simeq6$ with Deep JWST/NIRCam Imaging. https://doi.org/10.3847/2041-8213%2Facb26b

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