Year: 2025
Type: article
Abstract: Over the past few years JWST has been a major workhorse in detecting and constraining the metal enrichment of the first galaxies in the early Universe and finding the source of the ionisation of their interstellar medium. In this work, we present new deep JWST/NIRSpec spectroscopy of GS-z11-1, a galaxy at z = 11.28, in which we report the detection of multiple rest-frame UV and optical emission lines: CIII]λλ1907,09, CIV]λλ1548,51, [OII]λλ3726,29, [NeIII]λ3869, Hγ and tentative evidence for HeIIλ1640. The ionisation properties of GS-z11-1 are consistent with star formation, with potential contribution from an active galactic nucleus (AGN). We estimate a galaxy stellar mass of log(M⋆/M⊙) = 7.8±0.2 and log(SFR/(M⊙ yr−1))= 0.32±0.11 for the fiducial SF-only models. We measured C/O from the SED modelling of C/O = 1.20±0.15 × solar. This is one of the highest C/O abundances at z>10, and it is consistent with either PopII and PopIII enrichment paths. Despite this source being extremely compact, with a half-light radius of 73±10 pc, we see no increased equivalent width of NIV] and NIII] emission lines as seen in some other compact sources at similar redshifts, a potential signature of second-generation stars in GCs. Overall, this galaxy exhibits low metallicity and high ionisation parameter consistent with intense star-formation or AGN activity in the early Universe, possibly observed before the enrichment by the second generation of stars in proto-globular clusters in the core of the galaxy.
Source: Apollo (University of Cambridge)
DOI: 10.17863/cam.124073
Authors: Scholtz, J, Silcock, MS, Curtis-Lake, E, Maiolino, R, Carniani, S, D’Eugenio, F, Ji, X, Jakobsen, P, Hainline, K, Arribas, S, Baker, WM, Bhatawdekar, R, Bunker, AJ, Charlot, S, Chevallard, J, Curti, M, Eisenstein, Daniel J, Isobe, Y, Jones, GC, Parlanti, E, Pérez-González, PG, Rinaldi, P, Robertson, B, Tacchella, S, Übler, H, Williams, CC, Willott, C, Witstok, J
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, National Aeronautics and Space Administration, University of California, Santa Cruz, University of Arizona, Space Telescope Science Institute, UK Research and Innovation, European Commission, National Research Foundation, Danmarks Grundforskningsfond, Ministerio de Ciencia e Innovación, Science and Technology Facilities Council, Japan Society for the Promotion of Science, Agencia Estatal de Investigación
Awards: G103270039, G1166668239, G1175115578, G121809054, G1245046120, G1325949514, G1338664626, G1577046871, G1650125035, G1812695587, G1855990336, G2021250021, G2144673021, G2262748287, G2309174360, Star formation in galaxies from the Epoch of Reionisation to the present day with JWST, G256731684, G2601397997, G2660406951, G2685794135, G300979063, G3228396264, G3340416472, G3480869486, G3660973570, G3681454997, STFC Hertfordshire 2020 DTP, G4042783231, G425668148, Cosmic Dawn Center (DAWN), G430777504, G434337789, G4501905872, G490073602, G4915654406, G5080475149, G531848386, G5368796297, G5421974903, G5568641063, G6307073466, G6464745819, G7084143925, G7322907961, 古代説話における諸寺縁起の研究, G783242260, MRI: Acquisition of a High Performance Computer for Computational Science at UC Santa Cruz, G8931419319, G897484643, G971458805, 最先端近赤外線観測装置で探る初期銀河の化学組成, G99296377
OpenAlex ID: W7116269782
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