TY - JOUR
T1 - JADES
T2 - carbon-enhanced, nitrogen-normal compact 980, 242galaxy at z = 11.2
AU - Scholtz, J.
AU - Silcock, M. S.
AU - Curtis-Lake, E.
AU - Maiolino, R.
AU - Carniani, S.
AU - D’Eugenio, F.
AU - Ji, X.
AU - Jakobsen, P.
AU - Hainline, K.
AU - Arribas, S.
AU - Baker, W. M.
AU - Bhatawdekar, R.
AU - Bunker, A. J.
AU - Charlot, S.
AU - Chevallard, J.
AU - Curti, M.
AU - Eisenstein, Daniel J.
AU - Isobe, Y.
AU - Jones, G. C.
AU - Parlanti, E.
AU - Pérez-González, P. G.
AU - Rinaldi, P.
AU - Robertson, B.
AU - Tacchella, S.
AU - Übler, H.
AU - Williams, C. C.
AU - Willott, C.
AU - Witstok, J.
N1 - Publisher Copyright:
© The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2026/1/1
Y1 - 2026/1/1
N2 - Over the past few years James Webb Space Telescope (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 ionization 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 ionization 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)) = 0.3±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 ± 10pc, 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 ionization 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.
AB - Over the past few years James Webb Space Telescope (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 ionization 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 ionization 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)) = 0.3±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 ± 10pc, 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 ionization 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.
KW - galaxies: abundances
KW - galaxies: evolution
KW - galaxies: high-redshift
UR - https://www.scopus.com/pages/publications/105026662894
UR - https://www.scopus.com/pages/publications/105026662894#tab=citedBy
U2 - 10.1093/mnras/staf2107
DO - 10.1093/mnras/staf2107
M3 - Article
AN - SCOPUS:105026662894
SN - 0035-8711
VL - 545
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
M1 - staf2107
ER -