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Arxiv: Diverse Oxygen Abundance in Early Galaxies Unveiled by Auroral Line Analysis with JWST Published: 2/21/2024 9:17:41 PM Updated: 7/20/2024 12:38:10 AM

Paper abstract: We present deep JWST NIRSpec observations in the sightline of MACSJ1149.5+2223, a massive cluster of galaxies at z=0.54. We report thespectroscopic redshift of 28 sources at 37, i.e.comparable to the most metal poor galaxies in the local Universe. The search ofprimordial galaxies may be accomplished by extending toward a lower mass and/orby investigating inhomogeneities at smaller spatial scales. Lastly, weinvestigate potential systematics caused by the limitation of JWST's MSAobservations. Caution is warranted when the target exceeds the slit size, asthis situation could allow an overestimation of ``global" metallicity,especially under the presence of strong negative metallicity gradient.