JADES: Detecting [OIII] λ 4363 emitters and testing strong line calibrations in the high- z Universe with ultra-deep JWST/NIRSpec spectroscopy up to z ~ 9.5
Author
Laseter, I.H.Maseda, M.V.
Curti, M.
Maiolino, R.
D'Eugenio, F.
Cameron, A.J.
Looser, T.J.
Arribas, S.
Baker, W.M.
Bhatawdekar, R.
Boyett, K.
Bunker, A.J.
Carniani, S.
Charlot, S.

Chevallard, J.
Curtis-Lake, E.
Egami, E.
Eisenstein, D.J.
Hainline, K.
Hausen, R.
Ji, Z.
Kumari, N.
Perna, M.
Rawle, T.
Rix, H.-W.
Robertson, B.
Rodríguez, Del, Pino, B.
Sandles, L.
Scholtz, J.
Smit, R.
Tacchella, S.
Übler, H.

Williams, C.C.
Willott, C.
Witstok, J.
Affiliation
Steward Observatory, University of ArizonaIssue Date
2024-02-02
Metadata
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EDP SciencesCitation
A&A 681, A70 (2024)Journal
Astronomy and AstrophysicsRights
© The Authors 2024. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We present ten novel [OIII]λ4363 auroral line detections up to z~ 9.5 measured from ultra-deep JWST/NIRSpec MSA spectroscopy from the JWST Advanced Deep Extragalactic Survey (JADES). We leverage the deepest spectroscopic observations taken thus far with NIRSpec to determine electron temperatures and oxygen abundances using the direct Te method. We directly compare these results against a suite of locally calibrated strong-line diagnostics and recent high-z calibrations. We find the calibrations fail to simultaneously match our JADES sample, thus warranting a self-consistent revision of these calibrations for the high-z Universe. We find a weak dependence between R2 and O3O2 with metallicity, thus suggesting these line ratios are inefficient in the high-z Universe as metallicity diagnostics and degeneracy breakers. We find R3 and R23 are still correlated with metallicity, but we find a tentative flattening of these diagnostics, thus suggesting future difficulties when applying these strong line ratios as metallicity indicators in the high-z Universe. We also propose and test an alternative diagnostic based on a different combination of R3 and R2 with a higher dynamic range. We find a reasonably good agreement (median offset of 0.002 dex, median absolute offset of 0.13 dex) with the JWST sample at low metallicity, but future investigations are required on larger samples to probe past the turnover point. At a given metallicity, our sample demonstrates higher ionization and excitation ratios than local galaxies with rest-frame EWs(Hβ) ≈ 200-300 Å. However, we find the median rest-frame EWs(Hβ) of our sample to be~2× less than the galaxies used for the local calibrations. This EW discrepancy combined with the high ionization of our galaxies does not offer a clear description of [OIII]λ4363 production in the high-z Universe, thus warranting a much deeper examination into the factors influencing these processes. © 2024 EDP Sciences. All rights reserved.Note
Open access articleISSN
0004-6361Version
Final Published Versionae974a485f413a2113503eed53cd6c53
10.1051/0004-6361/202347133
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Except where otherwise noted, this item's license is described as © The Authors 2024. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License.