JADES: The emergence and evolution of Ly$α$ emission and constraints on the IGM neutral fraction
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| Natura: | Preprint |
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2023
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| author | Jones, Gareth C. Bunker, Andrew J. Saxena, Aayush Witstok, Joris Stark, Daniel P. Arribas, Santiago Baker, William M. Bhatawdekar, Rachana Bowler, Rebecca Boyett, Kristan Cameron, Alex J. Carniani, Stefano Charlot, Stephane Chevallard, Jacopo Curti, Mirko Curtis-Lake, Emma Eisenstein, Daniel J. Hainline, Kevin Hausen, Ryan Ji, Zhiyuan Johnson, Benjamin D. Kumari, Nimisha Looser, Tobias J. Maiolino, Roberto Maseda, Michael V. Parlanti, Eleonora Rix, Hans-Walter Robertson, Brant E. Sandles, Lester Scholtz, Jan Smit, Renske Tacchella, Sandro Ubler, Hannah Williams, Christina C. Willott, Chris |
| author_facet | Jones, Gareth C. Bunker, Andrew J. Saxena, Aayush Witstok, Joris Stark, Daniel P. Arribas, Santiago Baker, William M. Bhatawdekar, Rachana Bowler, Rebecca Boyett, Kristan Cameron, Alex J. Carniani, Stefano Charlot, Stephane Chevallard, Jacopo Curti, Mirko Curtis-Lake, Emma Eisenstein, Daniel J. Hainline, Kevin Hausen, Ryan Ji, Zhiyuan Johnson, Benjamin D. Kumari, Nimisha Looser, Tobias J. Maiolino, Roberto Maseda, Michael V. Parlanti, Eleonora Rix, Hans-Walter Robertson, Brant E. Sandles, Lester Scholtz, Jan Smit, Renske Tacchella, Sandro Ubler, Hannah Williams, Christina C. Willott, Chris |
| contents | The rest-frame UV recombination emission line Ly$α$ can be powered by ionising photons from young massive stars in star forming galaxies, but its ability to be resonantly scattered by neutral gas complicates its interpretation. For reionization era galaxies, a neutral intergalactic medium (IGM) will scatter Ly$α$ from the line of sight, making Ly$α$ a useful probe of the neutral fraction evolution. Here, we explore Ly$α$ in JWST/NIRSpec spectra from the ongoing JADES programme, which targets hundreds of galaxies in the well-studied GOODS-S and GOODS-N fields. These sources are UV-faint ($-20.4<\rm M_{\rm UV}<-16.4$), and thus represent a poorly-explored class of galaxies. The low spectral resolution ($R\sim100$) spectra of a subset of 84 galaxies in GOODS-S with $z_{spec}>5.6$ (as derived with optical lines) are fit with line and continuum models, in order to search for significant line emission. Through exploration of the R100 data, we find evidence for Ly$α$ in 17 sources. This sample allows us to place observational constraints on the fraction of galaxies with Ly$α$ emission in the redshift range $5.6<z<7.5$, with a decrease from $z=6$ to $z=7$. We also find a positive correlation between Ly$α$ equivalent width and M$_{UV}$, as seen in other samples. These results are used to estimate the neutral gas fraction at $z\sim7$, agreeing with previous results ($X_{HI}\sim0.5-0.9$). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_02471 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | JADES: The emergence and evolution of Ly$α$ emission and constraints on the IGM neutral fraction Jones, Gareth C. Bunker, Andrew J. Saxena, Aayush Witstok, Joris Stark, Daniel P. Arribas, Santiago Baker, William M. Bhatawdekar, Rachana Bowler, Rebecca Boyett, Kristan Cameron, Alex J. Carniani, Stefano Charlot, Stephane Chevallard, Jacopo Curti, Mirko Curtis-Lake, Emma Eisenstein, Daniel J. Hainline, Kevin Hausen, Ryan Ji, Zhiyuan Johnson, Benjamin D. Kumari, Nimisha Looser, Tobias J. Maiolino, Roberto Maseda, Michael V. Parlanti, Eleonora Rix, Hans-Walter Robertson, Brant E. Sandles, Lester Scholtz, Jan Smit, Renske Tacchella, Sandro Ubler, Hannah Williams, Christina C. Willott, Chris Astrophysics of Galaxies The rest-frame UV recombination emission line Ly$α$ can be powered by ionising photons from young massive stars in star forming galaxies, but its ability to be resonantly scattered by neutral gas complicates its interpretation. For reionization era galaxies, a neutral intergalactic medium (IGM) will scatter Ly$α$ from the line of sight, making Ly$α$ a useful probe of the neutral fraction evolution. Here, we explore Ly$α$ in JWST/NIRSpec spectra from the ongoing JADES programme, which targets hundreds of galaxies in the well-studied GOODS-S and GOODS-N fields. These sources are UV-faint ($-20.4<\rm M_{\rm UV}<-16.4$), and thus represent a poorly-explored class of galaxies. The low spectral resolution ($R\sim100$) spectra of a subset of 84 galaxies in GOODS-S with $z_{spec}>5.6$ (as derived with optical lines) are fit with line and continuum models, in order to search for significant line emission. Through exploration of the R100 data, we find evidence for Ly$α$ in 17 sources. This sample allows us to place observational constraints on the fraction of galaxies with Ly$α$ emission in the redshift range $5.6<z<7.5$, with a decrease from $z=6$ to $z=7$. We also find a positive correlation between Ly$α$ equivalent width and M$_{UV}$, as seen in other samples. These results are used to estimate the neutral gas fraction at $z\sim7$, agreeing with previous results ($X_{HI}\sim0.5-0.9$). |
| title | JADES: The emergence and evolution of Ly$α$ emission and constraints on the IGM neutral fraction |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2306.02471 |