Metal enrichment of a dusty star-forming galaxies at the EoR with JWST/INIRSpec IFS

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• Jan Scholtz / IoA
• Wednesday 05 March 2025, 13:15-13:40
• The Hoyle Lecture Theatre + Zoom .

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With the recent discovery of quiescent galaxies at z>3, studying of dusty star-forming galaxies at high redshift became more vital than ever, as they are thought to be precursors of quiescent galaxies. However, until the launch of JWST , studying the rest-frame of optical emission of these sources at redshifts higher than 3 was out of reach of astronomers, often solely relying on the ALMA observations of their FIR emission lines. In this talk, I will present one of the first JWST /NIRSpec IFS data of a massive dusty star-forming galaxy at the Epoch of Reionisation. COS -3018, is a unique UV bright galaxy (LUV>2 L*) at z~6.8, previously only observed using ALMA ([CII]158 microns, [OIII] 88 microns), VLT X -Shooter (Lyman-alpha) and HST broadband photometry. Furthermore, this galaxy has a large amount of dust (log Mdust =10.7 Msol) and an excess of [OIII]88micron emission suggesting that this might be an AGN or has non-standard ISM conditions such as AGN . I will present deep high-resolution JWST /NIRSpec IFS observations of rest-frame UV and optical continuum and emission lines, in combination with deep ALMA [CII] and [OIII]88micron observations and NIR Cam photometry. Using the deep and unique NIR Spec IFS (PRISM+R2700) observations, I will show the ISM conditions in this unique galaxy: excitation conditions (extreme star formation or AGN ?), metallicity gradient, location of dust obscured (from ALMA high resolution observations) and unobscured star formation. Finally, I will answer the question: What is driving such an extreme production of dust in this galaxy and UV luminosity in this galaxy?

This talk is part of the Institute of Astronomy Seminars series.

This talk is included in these lists:

• Cambridge Astronomy Talks
• Combined External Astrophysics Talks DAMTP
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• Cosmology, Astrophysics and General Relativity
• Institute of Astronomy Seminars
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• The Hoyle Lecture Theatre + Zoom

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