High-Redshift Galaxy Candidates at z > 6 as Revealed by JWST Observations of MACS0647
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| Format: | Preprint |
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2025
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| author | Worku, Keduse Hsiao, Tiger Yu-Yang Coe, Dan Abdurro'uf Resseguier, Tom Larson, Rebecca L. Antwi-Danso, Jacqueline Brammer, Gabriel Kokorev, Vasily Bradley, Larry D. Furtak, Lukas J. Oguri, Masamune |
| author_facet | Worku, Keduse Hsiao, Tiger Yu-Yang Coe, Dan Abdurro'uf Resseguier, Tom Larson, Rebecca L. Antwi-Danso, Jacqueline Brammer, Gabriel Kokorev, Vasily Bradley, Larry D. Furtak, Lukas J. Oguri, Masamune |
| contents | We present a catalog of 57 high-redshift $z>6$ galaxy candidates, including 14 spectroscopic confirmations ($z = 6.10$ -- 9.25), 2 Little Red Dots ($z = 4.77$, 5.81), and 2 interlopers ($z = 3.23$, 3.72), based on \JWST\ NIRCam imaging (7 filters), NIRSpec spectroscopy (PRISM and G395H), and archival \HST\ imaging (17 filters) of the strong lensing galaxy cluster MACS0647. Our highest redshift confirmation ($z = 9.25$) is an Extremely Blue Galaxy (presented in~\citealt{Yanagisawa2024}), and here we identify a spectral turnover likely due to damped Lyman-$α$. We identify an overdensity of galaxies with spectroscopic redshifts $z = 6.1$, confirming the $z \sim 6$ overdensity identified in \HST\ images. In one of these galaxies, our high-resolution G395H spectroscopy reveals two spatially resolved components with a velocity difference of $\sim$90 km/s; if these components are gravitationally bound, this would imply a dynamical mass on the order of $\sim 10^8\ M_\odot$ given their projected separation. We present spectral line fluxes, widths, and derived physical properties, including stellar masses ($10^8 - 10^9 \ \mathrm{M}_{\odot}$) and metallicities ($10\% - 40\% \ \mathrm{Z}_{\odot}$) for our spectroscopic sample. We note half of our NIRSpec data was obtained with standard 3-slitlet nods and half was obtained with single slitlets yielding similar results, demonstrating the power to observe more sources on a densely packed NIRSpec MSA. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_11985 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-Redshift Galaxy Candidates at z > 6 as Revealed by JWST Observations of MACS0647 Worku, Keduse Hsiao, Tiger Yu-Yang Coe, Dan Abdurro'uf Resseguier, Tom Larson, Rebecca L. Antwi-Danso, Jacqueline Brammer, Gabriel Kokorev, Vasily Bradley, Larry D. Furtak, Lukas J. Oguri, Masamune Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present a catalog of 57 high-redshift $z>6$ galaxy candidates, including 14 spectroscopic confirmations ($z = 6.10$ -- 9.25), 2 Little Red Dots ($z = 4.77$, 5.81), and 2 interlopers ($z = 3.23$, 3.72), based on \JWST\ NIRCam imaging (7 filters), NIRSpec spectroscopy (PRISM and G395H), and archival \HST\ imaging (17 filters) of the strong lensing galaxy cluster MACS0647. Our highest redshift confirmation ($z = 9.25$) is an Extremely Blue Galaxy (presented in~\citealt{Yanagisawa2024}), and here we identify a spectral turnover likely due to damped Lyman-$α$. We identify an overdensity of galaxies with spectroscopic redshifts $z = 6.1$, confirming the $z \sim 6$ overdensity identified in \HST\ images. In one of these galaxies, our high-resolution G395H spectroscopy reveals two spatially resolved components with a velocity difference of $\sim$90 km/s; if these components are gravitationally bound, this would imply a dynamical mass on the order of $\sim 10^8\ M_\odot$ given their projected separation. We present spectral line fluxes, widths, and derived physical properties, including stellar masses ($10^8 - 10^9 \ \mathrm{M}_{\odot}$) and metallicities ($10\% - 40\% \ \mathrm{Z}_{\odot}$) for our spectroscopic sample. We note half of our NIRSpec data was obtained with standard 3-slitlet nods and half was obtained with single slitlets yielding similar results, demonstrating the power to observe more sources on a densely packed NIRSpec MSA. |
| title | High-Redshift Galaxy Candidates at z > 6 as Revealed by JWST Observations of MACS0647 |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2512.11985 |