Journal article
The Mass–Metallicity Relation of Dwarf Galaxies at Cosmic Noon from JWST Observations
- Abstract:
- We present the mass-metallicity relation (MZR) at $z=2-3$ in the stellar mass range of $M_\star\approx 10^{6.5}-10^{9.5}M_\odot$ using 55 dwarf galaxies in the Abell 2744 and SMACS J0723-3732 galaxy cluster fields. These dwarf galaxies are identified and confirmed by deep JWST/NIRISS imaging and slitless grism spectroscopic observations. Taking advantage of the gravitational lensing effect, we extend the previous MZR relation at $z=2-3$ to a much lower mass regime by more than 2.5 orders of magnitude compared with previous studies. We find that the MZR has a shallower slope at the low-mass end ($M_\star<10^{9}M_\odot$) compared to that at the high-mass end ($M_\star>10^{9}M_\odot$), with a slope turnover point at around the stellar mass of $10^9 M_\odot$. This implies that dominating feedback processes in dwarf galaxies may be different from that in galaxies with higher mass. From $z=3$ to $z=2$, the metallicity of the dwarf galaxies is enhanced by $\approx0.1$ dex for a given stellar mass, consistent with the mild evolution found in galaxies with higher mass. Further, we confirm the existence of a 3D relation between the gas-phase metallicity, stellar mass, and star formation rate, i.e., fundamental metallicity relation (FMR), in dwarf galaxies at $z=2-3$. Our derived FMR, which has no significant redshift evolution, can be used as a benchmark to understand the origin of the anti-correlation between SFR and metallicity of dwarf galaxies in the high-redshift Universe.Comment: 16 pages, 4 figures, 1 table, submitted to AAS Journal; welcome comment
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, html, 14.0KB, Terms of use)
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- Publisher copy:
- 10.3847/2041-8213/acf470
Authors
+ MOST ∣ National Key Research and Development Program of China
More from this funder
- Grant:
- 2018YFA0404503
- Publisher:
- American Astronomical Society
- Journal:
- The Astrophysical Journal Letters More from this journal
- Volume:
- 955
- Issue:
- 1
- Pages:
- L18-L18
- Publication date:
- 2023-09-21
- DOI:
- EISSN:
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2041-8213
- ISSN:
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2041-8205
- Language:
-
English
- Keywords:
- Pubs id:
-
1548916
- Local pid:
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pubs:1548916
- Source identifiers:
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W4386955972
- Deposit date:
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2026-06-01
- ARK identifier:
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Terms of use
- Copyright date:
- 2023
- Licence:
- CC Attribution (CC BY)
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