Spatially resolved gas-phase metallicity at z~2-3 with JWST/NIRISS
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Acharyya, Ayan Watson, Peter J. Vulcani, Benedetta Treu, Tommaso Nedkova, Kalina V. Bunker, Andrew J. Mehta, Vihang Atek, Hakim Battisti, Andrew J. Hasan, Farhanul Hayes, Matthew J. Huberty, Mason Jones, Tucker Leethochawalit, Nicha Lin, Yu-Heng Malkan, Matthew A. Metha, Benjamin Nanayakkara, Themiya Rafelski, Marc Sattari, Zahra Scarlata, Claudia Wang, Xin Casey, Caitlin M. Grazian, Andrea Koekemoer, Anton M. Radovich, Mario Rodighiero, Giulia |
| author_facet | Acharyya, Ayan Watson, Peter J. Vulcani, Benedetta Treu, Tommaso Nedkova, Kalina V. Bunker, Andrew J. Mehta, Vihang Atek, Hakim Battisti, Andrew J. Hasan, Farhanul Hayes, Matthew J. Huberty, Mason Jones, Tucker Leethochawalit, Nicha Lin, Yu-Heng Malkan, Matthew A. Metha, Benjamin Nanayakkara, Themiya Rafelski, Marc Sattari, Zahra Scarlata, Claudia Wang, Xin Casey, Caitlin M. Grazian, Andrea Koekemoer, Anton M. Radovich, Mario Rodighiero, Giulia |
| contents | Spatially resolved gas-phase metallicity maps are a crucial element in understanding the chemical evolution of galaxies. We present spatially resolved metallicity maps obtained from NIRISS/WFSS observations. This is the first such work presenting multiple individual galaxies. We investigate the source of ionisation, metallicity and its relation to star-formation in a spatially-resolved sense for a sample of eight galaxies -- four from JWST-PASSAGE and four from GLASS-JWST ERS. All but one galaxy are in the redshift range $1.9 \leq z \leq 2$, the outlier being at $z = 3.1$. Our sample covers a range of $8.0 <$ \logM $< 9.5$ in stellar mass, $0.2 <$ $\log{\rm{(SFR}}$/\Msunpyr) $< 1.1$ in star-formation rate (SFR) and $7.8 <$ \logOH $< 9.0$ in global metallicity. As a solution to the challenge of SF-AGN demarcation in absence of resolved \halpha, we present a new SF-demarcation line in the \textit{OHNO} parameter space based on MAPPINGS v5.1 publicly available \hii region model grids. We present the mass-metallicity gradient relation for our sample, which showed no clear trend with stellar mass, perhaps hinting at the fact that the high-$z$ galaxies have not yet started their accretion dominated phase. By interpreting the correlation between spatially resolved metallicity and SFR maps as a proxy for effective timescales of metal-transport in galaxies, we find a weak trend such that this timescale increases with stellar mass, implying a more effective feedback in lower mass galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_05335 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spatially resolved gas-phase metallicity at z~2-3 with JWST/NIRISS Acharyya, Ayan Watson, Peter J. Vulcani, Benedetta Treu, Tommaso Nedkova, Kalina V. Bunker, Andrew J. Mehta, Vihang Atek, Hakim Battisti, Andrew J. Hasan, Farhanul Hayes, Matthew J. Huberty, Mason Jones, Tucker Leethochawalit, Nicha Lin, Yu-Heng Malkan, Matthew A. Metha, Benjamin Nanayakkara, Themiya Rafelski, Marc Sattari, Zahra Scarlata, Claudia Wang, Xin Casey, Caitlin M. Grazian, Andrea Koekemoer, Anton M. Radovich, Mario Rodighiero, Giulia Astrophysics of Galaxies Spatially resolved gas-phase metallicity maps are a crucial element in understanding the chemical evolution of galaxies. We present spatially resolved metallicity maps obtained from NIRISS/WFSS observations. This is the first such work presenting multiple individual galaxies. We investigate the source of ionisation, metallicity and its relation to star-formation in a spatially-resolved sense for a sample of eight galaxies -- four from JWST-PASSAGE and four from GLASS-JWST ERS. All but one galaxy are in the redshift range $1.9 \leq z \leq 2$, the outlier being at $z = 3.1$. Our sample covers a range of $8.0 <$ \logM $< 9.5$ in stellar mass, $0.2 <$ $\log{\rm{(SFR}}$/\Msunpyr) $< 1.1$ in star-formation rate (SFR) and $7.8 <$ \logOH $< 9.0$ in global metallicity. As a solution to the challenge of SF-AGN demarcation in absence of resolved \halpha, we present a new SF-demarcation line in the \textit{OHNO} parameter space based on MAPPINGS v5.1 publicly available \hii region model grids. We present the mass-metallicity gradient relation for our sample, which showed no clear trend with stellar mass, perhaps hinting at the fact that the high-$z$ galaxies have not yet started their accretion dominated phase. By interpreting the correlation between spatially resolved metallicity and SFR maps as a proxy for effective timescales of metal-transport in galaxies, we find a weak trend such that this timescale increases with stellar mass, implying a more effective feedback in lower mass galaxies. |
| title | Spatially resolved gas-phase metallicity at z~2-3 with JWST/NIRISS |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2508.05335 |