{"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/inside-out-growth-in-the-early-universe-a","title":"A core in a star-forming disc as evidence of inside-out growth in the early Universe","arxiv_id":"2306.02472","date":"2023-06-04","proceeding":null,"authors":["William M. Baker","Sandro Tacchella","Benjamin D. Johnson","Erica Nelson","Katherine A. Suess","Francesco D'Eugenio","Mirko Curti","Anna de Graaff","Zhiyuan Ji","Roberto Maiolino","Brant Robertson","Jan Scholtz","Stacey Alberts","Santiago Arribas","Kristan Boyett","Andrew J. Bunker","Stefano Carniani","Stephane Charlot","Zuyi Chen","Jacopo Chevallard","Emma Curtis-Lake","A. Lola Danhaive","Christa DeCoursey","Eiichi Egami","Daniel J. Eisenstein","Ryan Endsley","Ryan Hausen","Jakob M. Helton","Nimisha Kumari","Tobias J. Looser","Michael V. Maseda","Dávid Puskás","Marcia Rieke","Lester Sandles","Fengwu Sun","Hannah Übler","Christina C. Williams","Christopher N. A. Willmer","Joris Witstok"],"abstract":"The physical processes that establish the morphological evolution and the structural diversity of galaxies are key unknowns in extragalactic astrophysics. Here we report the finding of the morphologically-mature galaxy JADES-GS+53.18343-27.79097, which existed within the first 700 million years of the Universe's history. This star-forming galaxy with a stellar mass of 400 million solar masses consists of three components, a highly-compact core with a half-light radius of less than 100 pc, an actively star-forming disc with a radius of about 400 pc, and a star-forming clump, which all show distinctive star-formation histories. The central stellar mass density of this galaxy is within a factor of two of the most massive present-day ellipticals, while being globally 1000 times less massive. The radial profile of the specific star-formation rate is rising toward the outskirts. This evidence suggests the first detection of inside-out growth of a galaxy as a proto-bulge and a star-forming disc in the Epoch of Reionization.","url_abs":"https://arxiv.org/abs/2306.02472v2","url_pdf":"https://arxiv.org/pdf/2306.02472v2.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":"inside-out-growth-in-the-early-universe-a","repo_url":"https://github.com/bd-j/forcepho","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":0,"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}