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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

Laseter, IH, Maseda, MV, Curti, M, Maiolino, R, D'Eugenio, F, Cameron, AJ, Looser, TJ, Arribas, S, Baker, WM, Bhatawdekar, R, Boyett, K, Bunker, AJ, Carniani, S, Charlot, S, Chevallard, J, Curtis-Lake, E, Egami, E, Eisenstein, DJ, Hainline, K, Hausen, R , Ji, Z, Kumari, N, Perna, M, Rawle, T, Rix, HW, Robertson, B, Rodríguez Del Pino, B, Sandles, L, Scholtz, J, Smit, R, Tacchella, S, Übler, H, Williams, CC, Willott, C and Witstok, J (2024) 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. Astronomy and Astrophysics, 681. ISSN 0004-6361

JADES Detecting OII4363 emitters and testing strong line calibrations in the highz Universe with ultra-deep JWSTNIRSpec spectroscopy up to z  9.5.pdf - Published Version
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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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
SWORD Depositor: A Symplectic
Date Deposited: 16 May 2024 14:49
Last Modified: 16 May 2024 15:00
DOI or ID number: 10.1051/0004-6361/202347133
URI: https://researchonline.ljmu.ac.uk/id/eprint/23285
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