JADES: A Prominent Galaxy Overdensity Candidate within the First 500 Myr
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918299717074944 |
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| author | Wu, Zihao Eisenstein, Daniel J. Johnson, Benjamin D. Hainline, Kevin Baker, William M. Bunker, Andrew J. Cameron, Alex J. Curtis-Lake, Emma Danhaive, A. Lola Hausen, Ryan Helton, Jakob M. Ji, Zhiyuan Looser, Tobias J. Maiolino, Roberto Mengistu, Petra Rinaldi, Pierluigi Robertson, Brant E. Sun, Fengwu Tacchella, Sandro Trussler, James A. A. Williams, Christina C. Willmer, Christopher N. A. Witstok, Joris |
| author_facet | Wu, Zihao Eisenstein, Daniel J. Johnson, Benjamin D. Hainline, Kevin Baker, William M. Bunker, Andrew J. Cameron, Alex J. Curtis-Lake, Emma Danhaive, A. Lola Hausen, Ryan Helton, Jakob M. Ji, Zhiyuan Looser, Tobias J. Maiolino, Roberto Mengistu, Petra Rinaldi, Pierluigi Robertson, Brant E. Sun, Fengwu Tacchella, Sandro Trussler, James A. A. Williams, Christina C. Willmer, Christopher N. A. Witstok, Joris |
| contents | We report a galaxy overdensity candidate at $z\approx 10.5$ in the JWST Advanced Deep Extragalactic Survey (JADES). This overdensity contains 18 galaxies with consistent photometric redshifts and robust F115W dropouts within 8 comoving Mpc in projection. The galaxy number density is four times higher than the field expectation, accounting for one-third of comparably bright galaxies and nearly 50% of the total star formation rate at $10<z_\mathrm{phot}<12$ in the GOODS-S field. Two compact members of the overdensity show potential Balmer breaks suggestive of evolved stellar populations or little red dots (LRDs). One-third of galaxies have close companions or substructures within 1 kpc at consistent photometric redshifts, implying more frequent interactions in an overdense environment. Most galaxies have stellar masses of 0.6-3$\times10^8$ $M_\odot$, half-light radii of $\sim$200 pc, and star formation rates of $\sim$5 $M_\odot \mathrm{yr^{-1}}$, with no significant deviation from typical high-redshift scaling relations. We find tentative evidence for a spatially varying Ly$α$ transmission inferred photometrically, consistent with an emerging ionized bubble. This overdensity provides a rare opportunity for probing the environmental impact on galaxy evolution and the onset of cosmic reionization within the first 500 Myr. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_15960 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | JADES: A Prominent Galaxy Overdensity Candidate within the First 500 Myr Wu, Zihao Eisenstein, Daniel J. Johnson, Benjamin D. Hainline, Kevin Baker, William M. Bunker, Andrew J. Cameron, Alex J. Curtis-Lake, Emma Danhaive, A. Lola Hausen, Ryan Helton, Jakob M. Ji, Zhiyuan Looser, Tobias J. Maiolino, Roberto Mengistu, Petra Rinaldi, Pierluigi Robertson, Brant E. Sun, Fengwu Tacchella, Sandro Trussler, James A. A. Williams, Christina C. Willmer, Christopher N. A. Witstok, Joris Astrophysics of Galaxies We report a galaxy overdensity candidate at $z\approx 10.5$ in the JWST Advanced Deep Extragalactic Survey (JADES). This overdensity contains 18 galaxies with consistent photometric redshifts and robust F115W dropouts within 8 comoving Mpc in projection. The galaxy number density is four times higher than the field expectation, accounting for one-third of comparably bright galaxies and nearly 50% of the total star formation rate at $10<z_\mathrm{phot}<12$ in the GOODS-S field. Two compact members of the overdensity show potential Balmer breaks suggestive of evolved stellar populations or little red dots (LRDs). One-third of galaxies have close companions or substructures within 1 kpc at consistent photometric redshifts, implying more frequent interactions in an overdense environment. Most galaxies have stellar masses of 0.6-3$\times10^8$ $M_\odot$, half-light radii of $\sim$200 pc, and star formation rates of $\sim$5 $M_\odot \mathrm{yr^{-1}}$, with no significant deviation from typical high-redshift scaling relations. We find tentative evidence for a spatially varying Ly$α$ transmission inferred photometrically, consistent with an emerging ionized bubble. This overdensity provides a rare opportunity for probing the environmental impact on galaxy evolution and the onset of cosmic reionization within the first 500 Myr. |
| title | JADES: A Prominent Galaxy Overdensity Candidate within the First 500 Myr |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.15960 |