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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.08977 |
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| _version_ | 1866909462019702784 |
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| author | Jiang, Linhua Fu, Shuqi Wang, Feige Bosman, Sarah E. I. Cai, Zheng Jun, Hyunsung D. Pan, Zhiwei Sun, Fengwu Yang, Jinyi Zhang, Huanian |
| author_facet | Jiang, Linhua Fu, Shuqi Wang, Feige Bosman, Sarah E. I. Cai, Zheng Jun, Hyunsung D. Pan, Zhiwei Sun, Fengwu Yang, Jinyi Zhang, Huanian |
| contents | We present constraints on the spacetime variation of the fine-structure constant $α$ at redshifts $2.5\le z<9.5$ using JWST emission-line galaxies. The galaxy sample consists of 621 high-quality spectra with strong and narrow [O III] $λλ$4959,5007 doublet emission lines from 578 galaxies, including 232 spectra at $z>5$. The [O III] doublet lines are arguably the best emission lines to probe the variation in $α$. We divide our sample into six subsamples based on redshift and calculate the relative variation $Δα/α$ for the individual subsamples. The calculated $Δα/α$ values are consistent with zero within $1σ$ at all redshifts, suggesting no time variation in $α$ above a level of $(1-2) \times10^{-4}$ ($1σ$) in the past 13.2 billion years. When the whole sample is combined, the constraint is improved to be $Δα/α= (0.2\pm0.7) \times10^{-4}$. We further test the spatial variation in $α$ using four subsamples of galaxies in four different directions on the sky. The measured $Δα/α$ values are consistent with zero at a $1σ$ level of $\sim 2\times10^{-4}$. While the constraints in this work are not as stringent as those from lower-redshift quasar absorption lines in previous studies, this work uses an independent tracer and provides the first constraints on $Δα/α$ at the highest redshifts. With the growing number of emission-line galaxies from JWST, we expect to achieve stronger constraints in the future. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_08977 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Constraints on the variation of the fine-structure constant at 3<z<10 with JWST emission-line galaxies Jiang, Linhua Fu, Shuqi Wang, Feige Bosman, Sarah E. I. Cai, Zheng Jun, Hyunsung D. Pan, Zhiwei Sun, Fengwu Yang, Jinyi Zhang, Huanian Cosmology and Nongalactic Astrophysics We present constraints on the spacetime variation of the fine-structure constant $α$ at redshifts $2.5\le z<9.5$ using JWST emission-line galaxies. The galaxy sample consists of 621 high-quality spectra with strong and narrow [O III] $λλ$4959,5007 doublet emission lines from 578 galaxies, including 232 spectra at $z>5$. The [O III] doublet lines are arguably the best emission lines to probe the variation in $α$. We divide our sample into six subsamples based on redshift and calculate the relative variation $Δα/α$ for the individual subsamples. The calculated $Δα/α$ values are consistent with zero within $1σ$ at all redshifts, suggesting no time variation in $α$ above a level of $(1-2) \times10^{-4}$ ($1σ$) in the past 13.2 billion years. When the whole sample is combined, the constraint is improved to be $Δα/α= (0.2\pm0.7) \times10^{-4}$. We further test the spatial variation in $α$ using four subsamples of galaxies in four different directions on the sky. The measured $Δα/α$ values are consistent with zero at a $1σ$ level of $\sim 2\times10^{-4}$. While the constraints in this work are not as stringent as those from lower-redshift quasar absorption lines in previous studies, this work uses an independent tracer and provides the first constraints on $Δα/α$ at the highest redshifts. With the growing number of emission-line galaxies from JWST, we expect to achieve stronger constraints in the future. |
| title | Constraints on the variation of the fine-structure constant at 3<z<10 with JWST emission-line galaxies |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2405.08977 |