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Ionizing Photon Production Efficiencies and Chemical Abundances at Cosmic Dawn Revealed by Ultradeep Rest-frame Optical Spectroscopy of JADES-GS-z14-0

  • Authors: Jakob M. Helton, Jane E. Morrison, Kevin N. Hainline, Francesco D'Eugenio, George H. Rieke, Stacey Alberts, Stefano Carniani, Joel Leja, Yijia Li, 轶佳 李, Pierluigi Rinaldi, Jan Scholtz, Meredith Stone, Christopher N. A. Willmer, Zihao Wu, William M. Baker, Andrew J. Bunker, Stephane Charlot, Jacopo Chevallard, Nikko J. Cleri, Mirko Curti, Emma Curtis-Lake, Eiichi Egami, Daniel J. Eisenstein, Peter Jakobsen, Zhiyuan Ji, Benjamin D. Johnson, Nimisha Kumari, Xiaojing Lin, Jianwei Lyu, Roberto Maiolino, Michael Maseda, Pablo G. Pérez-González, Marcia J. Rieke, Brant Robertson, Aayush Saxena, Fengwu Sun, Sandro Tacchella, Hannah Übler, Giacomo Venturi, Christina C. Williams, Chris Willott, Joris Witstok, Yongda Zhu

Jakob M. Helton et al 2026 The Astrophysical Journal Letters 1004 .

  • Provider: AAS Journals

Caption: Figure 3.

Zoomed-in views around the strongest rest-frame optical emission lines. From left to right, we show the final MIRI/LRS 1D spectrum centered around [O II]λλ3727, 3729, Hβ + [O III]λλ4959, 5007, and Hα, respectively. Top panels: the best-fit continua and line profiles are shown in red along with the measured flux densities shown by the black lines and the flux uncertainties (1σ) shown by the gray shaded regions. Blue, vertical lines once again indicate the locations for some of the strongest emission lines. Bottom panels: the residuals of the best-fit models compared with the observations are shown by solid black lines and gray shaded regions. We report the reduced chi-squared statistics to demonstrate the quality of our fits.

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