{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/jwst-fresco-a-comprehensive-census-of-h-b","title":"JWST FRESCO: a comprehensive census of H$β$+[OIII] emitters at 6.8<z<9.0 in the GOODS fields","arxiv_id":"2405.05111","date":"2024-05-08","proceeding":null,"authors":["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"],"abstract":"We present the census of H$\\beta$+[OIII] 4960,5008 \\AA emitters at 6.8<z<9.0 from the JWST FRESCO survey over 124 arcmin$^2$ 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 $f_{[OIII]}\\gtrsim 1\\times 10^{-18}\\ \\rm{ergs}\\ \\rm{s}^{-1} \\ \\rm{cm}^{-2}$. The rest-frame optical line ratios of the median stacked spectrum (median $M_{\\rm{UV}}=-19.65^{+0.59}_{-1.05}$) indicate negligible dust attenuation, low metallicity ($12+\\log(\\rm{O/H})= 7.2-7.7$) and a high ionisation parameter $\\log_{10}U \\simeq -2.5$. We find a factor $\\times 1.3$ 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 $z\\gtrsim 6-7$ 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 $\\sim 10-20\\%$ 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.","url_abs":"https://arxiv.org/abs/2405.05111v3","url_pdf":"https://arxiv.org/pdf/2405.05111v3.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"jwst-fresco-a-comprehensive-census-of-h-b","repo_url":"https://github.com/rameyer/fresco","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}