The chemical enrichment in the early Universe as probed by JWST via direct metallicity measurements at z similar to 8
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The chemical enrichment in the early Universe as probed by JWST via direct metallicity measurements at z similar to 8. / Curti, Mirko; D'Eugenio, Francesco; Carniani, Stefano; Maiolino, Roberto; Sandles, Lester; Witstok, Joris; Baker, William M.; Bennett, Jake S.; Piotrowska, Joanna M.; Tacchella, Sandro; Charlot, Stephane; Nakajima, Kimihiko; Maheson, Gabriel; Mannucci, Filippo; Amiri, Amirnezam; Arribas, Santiago; Belfiore, Francesco; Bonaventura, Nina R.; Bunker, Andrew J.; Chevallard, Jacopo; Cresci, Giovanni; Curtis-Lake, Emma; Hayden-Pawson, Connor; Jones, Gareth C.; Kumari, Nimisha; Laseter, Isaac; Looser, Tobias J.; Marconi, Alessandro; Maseda, Michael; Scholtz, Jan; Smit, Renske; Ubler, Hannah; Wallace, Imaan E. B.
In: Monthly Notices of the Royal Astronomical Society, Vol. 518, No. 1, 28.01.2023, p. 425-438.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The chemical enrichment in the early Universe as probed by JWST via direct metallicity measurements at z similar to 8
AU - Curti, Mirko
AU - D'Eugenio, Francesco
AU - Carniani, Stefano
AU - Maiolino, Roberto
AU - Sandles, Lester
AU - Witstok, Joris
AU - Baker, William M.
AU - Bennett, Jake S.
AU - Piotrowska, Joanna M.
AU - Tacchella, Sandro
AU - Charlot, Stephane
AU - Nakajima, Kimihiko
AU - Maheson, Gabriel
AU - Mannucci, Filippo
AU - Amiri, Amirnezam
AU - Arribas, Santiago
AU - Belfiore, Francesco
AU - Bonaventura, Nina R.
AU - Bunker, Andrew J.
AU - Chevallard, Jacopo
AU - Cresci, Giovanni
AU - Curtis-Lake, Emma
AU - Hayden-Pawson, Connor
AU - Jones, Gareth C.
AU - Kumari, Nimisha
AU - Laseter, Isaac
AU - Looser, Tobias J.
AU - Marconi, Alessandro
AU - Maseda, Michael
AU - Scholtz, Jan
AU - Smit, Renske
AU - Ubler, Hannah
AU - Wallace, Imaan E. B.
PY - 2023/1/28
Y1 - 2023/1/28
N2 - We analyse the chemical properties of three z similar to 8 galaxies behind the galaxy cluster SMACSJ0723.3-7327, observed as part of the Early Release Observations programme of the James Webb Space Telescope. Exploiting [O III]lambda 4363 auroral line detections in NIRSpec spectra, we robustly apply the direct T-e method for the very first time at such high redshift, measuring metallicities ranging from extremely metal poor (12 + log(O/H)approximate to 7) to about one-third solar. We also discuss the excitation properties of these sources, and compare them with local strong-line metallicity calibrations. We find that none of the considered diagnostics match simultaneously the observed relations between metallicity and strong-line ratios for the three sources, implying that a proper re-assessment of the calibrations may be needed at these redshifts. On the mass-metallicity plane, the two galaxies at z similar to 7.6 (log(M-*/M-circle dot) = 8.1, 8.7) have metallicities that are consistent with the extrapolation of the mass-metallicity relation at z similar to 2-3, while the least massive galaxy at z similar to 8.5 (Log(M-*/M-circle dot) = 7.8) shows instead a significantly lower metallicity. The three galaxies show different level of offset relative to the Fundamental Metallicity Relation, with two of them (at z similar to 7.6) being marginally consistent, while the z similar to 8.5 source deviating significantly, being probably far from the smooth equilibrium between gas flows, star formation, and metal enrichment in place at later epochs.
AB - We analyse the chemical properties of three z similar to 8 galaxies behind the galaxy cluster SMACSJ0723.3-7327, observed as part of the Early Release Observations programme of the James Webb Space Telescope. Exploiting [O III]lambda 4363 auroral line detections in NIRSpec spectra, we robustly apply the direct T-e method for the very first time at such high redshift, measuring metallicities ranging from extremely metal poor (12 + log(O/H)approximate to 7) to about one-third solar. We also discuss the excitation properties of these sources, and compare them with local strong-line metallicity calibrations. We find that none of the considered diagnostics match simultaneously the observed relations between metallicity and strong-line ratios for the three sources, implying that a proper re-assessment of the calibrations may be needed at these redshifts. On the mass-metallicity plane, the two galaxies at z similar to 7.6 (log(M-*/M-circle dot) = 8.1, 8.7) have metallicities that are consistent with the extrapolation of the mass-metallicity relation at z similar to 2-3, while the least massive galaxy at z similar to 8.5 (Log(M-*/M-circle dot) = 7.8) shows instead a significantly lower metallicity. The three galaxies show different level of offset relative to the Fundamental Metallicity Relation, with two of them (at z similar to 7.6) being marginally consistent, while the z similar to 8.5 source deviating significantly, being probably far from the smooth equilibrium between gas flows, star formation, and metal enrichment in place at later epochs.
KW - galaxies: abundances
KW - galaxies: evolution
KW - galaxies: general
KW - galaxies: ISM
KW - STAR-FORMING GALAXIES
KW - MASS-METALLICITY
KW - ILLUSTRISTNG SIMULATIONS
KW - MOSDEF SURVEY
KW - STELLAR POPULATIONS
KW - EAGLE SIMULATIONS
KW - LINE RATIOS
KW - LY-ALPHA
KW - EVOLUTION
KW - ABUNDANCE
U2 - 10.1093/mnras/stac2737
DO - 10.1093/mnras/stac2737
M3 - Journal article
VL - 518
SP - 425
EP - 438
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
ER -
ID: 337692113