JWST spectroscopy of $z\sim 5-8$ UV-selected galaxies: New constraints on the evolution of the Ly$α$ escape fraction in the reionization era
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| Format: | Preprint |
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2023
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| _version_ | 1866929249850490880 |
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| author | Chen, Zuyi Stark, Daniel P. Mason, Charlotte Topping, Michael W. Whitler, Lily Tang, Mengtao Endsley, Ryan Charlot, Stéphane |
| author_facet | Chen, Zuyi Stark, Daniel P. Mason, Charlotte Topping, Michael W. Whitler, Lily Tang, Mengtao Endsley, Ryan Charlot, Stéphane |
| contents | We describe {\it JWST}/NIRSpec prism measurements of Ly$α$ emission in $z\gtrsim 5$ galaxies. We identify Ly$α$ detections in 10 out of 69 galaxies with robust rest-optical emission line redshift measurements at $5\leq z<7$ in the CEERS and DDT-2750 observations of the EGS field. Galaxies at $z\simeq 6$ with faint continuum (F150W $=$ 27--29 mag) are found with extremely large rest-frame Ly$α$ equivalent widths (ranging up to 286 A). Likely Ly$α$ detections are also seen in two new $z>7$ galaxies ($z=$ 7.49 and 7.17) from the second epoch of CEERS observations, both showing large Ly$α$ equivalent widths that likely indicate significant transmission through the IGM. We measure high Ly$α$ escape fractions in the 12 Ly$α$ emitters in our sample (median 0.28), two of which show $f_{\rm esc}^{ {\rm Ly}α}$ near unity ($>0.80$). We find that $50_{-11}^{+11}$% of $z\simeq 6$ galaxies with [OIII]+H$β$ EW $>$ 1000 A have $f_{\rm esc}^{ {\rm Ly}α}$ $>0.2$, consistent with the fractions found in lower-redshift samples with matched [OIII]+H$β$ EWs. While uncertainties are still significant, we find that only $10_{-5}^{+9}$% of $z>7$ galaxies with similarly strong rest optical emission lines show such large $f_{\rm esc}^{ {\rm Ly}α}$, as may be expected if IGM attenuation of Ly$α$ increases towards higher redshifts. We identify photometric galaxy overdensities near the $z\gtrsim 7$ Ly$α$ emitters, potentially providing the ionizing flux necessary to create large ionized sightlines that facilitate Ly$α$ transmission. Finally, we investigate the absence of Ly$α$ emission in a comparable (and spectroscopically confirmed) galaxy overdensity at $z=7.88$ in the Abell 2744 field, discussing new prism spectra of the field obtained with the UNCOVER program. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2311_13683 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | JWST spectroscopy of $z\sim 5-8$ UV-selected galaxies: New constraints on the evolution of the Ly$α$ escape fraction in the reionization era Chen, Zuyi Stark, Daniel P. Mason, Charlotte Topping, Michael W. Whitler, Lily Tang, Mengtao Endsley, Ryan Charlot, Stéphane Astrophysics of Galaxies We describe {\it JWST}/NIRSpec prism measurements of Ly$α$ emission in $z\gtrsim 5$ galaxies. We identify Ly$α$ detections in 10 out of 69 galaxies with robust rest-optical emission line redshift measurements at $5\leq z<7$ in the CEERS and DDT-2750 observations of the EGS field. Galaxies at $z\simeq 6$ with faint continuum (F150W $=$ 27--29 mag) are found with extremely large rest-frame Ly$α$ equivalent widths (ranging up to 286 A). Likely Ly$α$ detections are also seen in two new $z>7$ galaxies ($z=$ 7.49 and 7.17) from the second epoch of CEERS observations, both showing large Ly$α$ equivalent widths that likely indicate significant transmission through the IGM. We measure high Ly$α$ escape fractions in the 12 Ly$α$ emitters in our sample (median 0.28), two of which show $f_{\rm esc}^{ {\rm Ly}α}$ near unity ($>0.80$). We find that $50_{-11}^{+11}$% of $z\simeq 6$ galaxies with [OIII]+H$β$ EW $>$ 1000 A have $f_{\rm esc}^{ {\rm Ly}α}$ $>0.2$, consistent with the fractions found in lower-redshift samples with matched [OIII]+H$β$ EWs. While uncertainties are still significant, we find that only $10_{-5}^{+9}$% of $z>7$ galaxies with similarly strong rest optical emission lines show such large $f_{\rm esc}^{ {\rm Ly}α}$, as may be expected if IGM attenuation of Ly$α$ increases towards higher redshifts. We identify photometric galaxy overdensities near the $z\gtrsim 7$ Ly$α$ emitters, potentially providing the ionizing flux necessary to create large ionized sightlines that facilitate Ly$α$ transmission. Finally, we investigate the absence of Ly$α$ emission in a comparable (and spectroscopically confirmed) galaxy overdensity at $z=7.88$ in the Abell 2744 field, discussing new prism spectra of the field obtained with the UNCOVER program. |
| title | JWST spectroscopy of $z\sim 5-8$ UV-selected galaxies: New constraints on the evolution of the Ly$α$ escape fraction in the reionization era |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2311.13683 |