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JWST's TEMPLATES for star formation: the first resolved gas-phase metallicity maps of dust-obscured star-forming galaxies at z ∼ 4

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DOIResolve DOI: https://doi.org/10.3847/1538-4357/acf712
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0002-3272-7568; Search for: ORCID identifier: https://orcid.org/0000-0001-6251-4988; Search for: ORCID identifier: https://orcid.org/0000-0003-1815-0114; Search for: ORCID identifier: https://orcid.org/0000-0003-3256-5615; Search for: ORCID identifier: https://orcid.org/0000-0002-6290-3198; Search for: ORCID identifier: https://orcid.org/0000-0003-1074-4807; Search for: ORCID identifier: https://orcid.org/0000-0002-4657-7679; Search for: 1; Search for: ORCID identifier: https://orcid.org/0000-0002-0933-8601; Search for: ORCID identifier: https://orcid.org/0000-0002-7472-7697; Search for: ORCID identifier: https://orcid.org/0000-0003-4073-3236; Search for: ORCID identifier: https://orcid.org/0000-0002-3475-7648; Search for: ORCID identifier: https://orcid.org/0000-0001-6505-0293; Search for: ORCID identifier: https://orcid.org/0000-0003-3266-2001; Search for: ORCID identifier: https://orcid.org/0000-0001-6919-1237; Search for: ORCID identifier: https://orcid.org/0000-0002-7064-4309; Search for: ORCID identifier: https://orcid.org/0000-0002-4606-4240; Search for: ORCID identifier: https://orcid.org/0000-0001-7946-557X; Search for: ORCID identifier: https://orcid.org/0000-0001-7477-1586; Search for: ORCID identifier: https://orcid.org/0000-0002-7627-6551; Search for: ORCID identifier: https://orcid.org/0000-0003-1545-5078; Search for: ORCID identifier: https://orcid.org/0000-0001-6629-0379; Search for: ORCID identifier: https://orcid.org/0000-0002-3187-1648; Search for: ORCID identifier: https://orcid.org/0000-0001-7192-3871; Search for: ORCID identifier: https://orcid.org/0000-0001-7610-5544; Search for: ORCID identifier: https://orcid.org/0000-0003-4678-3939
Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FormatText, Article
Subjectgalaxy evolution; high-redshift galaxies; galaxy formation; starburst galaxies; strong gravitational lensing
Abstract
We present the first spatially resolved maps of gas-phase metallicity for two dust-obscured star-forming galaxies at z ∼ 4, from the JWST TEMPLATES Early Release Science program, derived from NIRSpec integral field unit spectroscopy of the Hα and [N ii] emission lines. Empirical optical line calibrations are used to determine that the sources are globally enriched to near-solar levels. While one source shows elevated [N ii]/Hα ratios and broad Hα emission consistent with the presence of an active galactic nucleus in a ≳1 kpc region, we argue that both systems have already undergone significant metal enrichment as a result of their extremely high star formation rates. Utilizing Atacama Large Millimeter/submillimeter Array rest-frame 380 μm continuum and [Ci](³P₂–³P₁) line maps we compare the spatial variation of the metallicity and gas-to-dust ratio in the two galaxies, finding the two properties to be anticorrelated on highly resolved spatial scales, consistent with various literature studies of z ∼ 0 galaxies. The data are indicative of the enormous potential of JWST to probe the enrichment of the interstellar medium on ∼kpc scales in extremely dust-obscured systems at z ∼ 4 and beyond.
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PublisherIOP
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  • The Astrophysical Journal 958, no. 1, 64 (5 December 2023).
LanguageEnglish
Peer reviewedYes
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Record created2024-04-11
Record modified2024-04-11
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