Papers › JWST FRESCO: a comprehensive census of H$β$+[OIII] emitters at 6.8<z<9.0 in the GOODS fields
JWST FRESCO: a comprehensive census of H$β$+[OIII] emitters at 6.8<z<9.0 in the GOODS fields
R. A. Meyer, P. A. Oesch, E. Giovinazzo, A. Weibel, G. Brammer, J. Matthee, R. P. Naidu, R. J. Bouwens, J. Chisholm, A. Covelo-Paz, Y. Fudamoto, M. Maseda, E. Nelson, I. Shivaei, M. Xiao, T. Herard-Demanche, G. D. Illingworth, J. Kerutt, I. Kramarenko, I. Labbe, E. Leonova, D. Magee, J. Matharu, G. Prieto Lyon, N. Reddy, D. Schaerer, A. Shapley, M. Stefanon, M. A. Wozniak, S. Wuyts
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We present the census of Hβ+[OIII] 4960,5008 \AA emitters at 6.8<z<9.0 from the JWST FRESCO survey over 124 arcmin² in the GOODS-North and GOODS-South fields. Our unbiased spectroscopic search results in 137 spectroscopically-confirmed galaxies at 6.8<z<9.0 with observed [OIII] fluxes f_([OIII])≳1×10⁻¹⁸ ergs s⁻¹ cm⁻². The rest-frame optical line ratios of the median stacked spectrum (median M_(UV)=-19.65^(+0.59)_(-1.05)) indicate negligible dust attenuation, low metallicity (12+log(O/H)= 7.2-7.7) and a high ionisation parameter log₁₀U ≃-2.5. We find a factor ×1.3 difference in the number density of 6.8<z<9.0 galaxies between GOODS-South and GOODS-North, which is caused by a single overdensity at 7.0<z<7.2 in GOODS-North. The bright end of the UV luminosity function of spectroscopically-confirmed [OIII] emitters is in good agreement with HST dropout-selected samples. Discrepancies between the observed [OIII] LF, [OIII]/UV ratio and [OIII] equivalent widths, and that predicted by theoretical models, suggest burstier star-formation histories and/or more heterogeneous metallicity and ionising conditions in z>7 galaxies. We report a rapid decline of the [OIII] luminosity density at z≳6-7 which cannot be explained by the evolution of the cosmic star-formation rate density. Finally we find that FRESCO detects in only 2h galaxies likely accounting for ∼10-20% of the ionising budget at z=7-8 (assuming an escape fraction of 10%), raising the prospect of directly detecting a significant fraction of the sources of reionisation with JWST.
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