{"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/unraveling-emission-line-galaxy-conformity-at","title":"Unraveling emission line galaxy conformity at z~1 with DESI early data","arxiv_id":"2310.09329","date":"2023-10-13","proceeding":null,"authors":["Sihan Yuan","Risa H. Wechsler","Yunchong Wang","Mithi A. C. de los Reyes","Justin Myles","Antoine Rocher","Boryana Hadzhiyska","Jessica Nicole Aguilar","Steven Ahlen","David Brooks","Todd Claybaugh","Shaun Cole","Axel de la Macorra","Jaime E. Forero-Romero","Satya Gontcho A Gontcho","Julien Guy","Klaus Honscheid","Theodore Kisner","Michael Levi","Marc Manera","Aaron Meisner","Ramon Miquel","John Moustakas","Jundan Nie","Nathalie Palanque-Delabrouille","Claire Poppett","Mehdi Rezaie","Ashley J. Ross","Graziano Rossi","Eusebio Sanchez","Michael Schubnel","Hee- Jong Seo","Gregory Tarlé","Benjamin Alan Weaver","Zhimin Zhou"],"abstract":"Emission line galaxies (ELGs) are now the preeminent tracers of large-scale structure at z>0.8 due to their high density and strong emission lines, which enable accurate redshift measurements. However, relatively little is known about ELG evolution and the ELG-halo connection, exposing us to potential modeling systematics in cosmology inference using these sources. In this paper, we propose a physical picture of ELGs and improve ELG-halo connection modeling using a variety of observations and simulated galaxy models. We investigate DESI-selected ELGs in COSMOS data, and infer that ELGs are rapidly star-forming galaxies with a large fraction exhibiting disturbed morphology, implying that many of them are likely to be merger-driven starbursts. We further postulate that the tidal interactions from mergers lead to correlated star formation in central-satellite ELG pairs, a phenomenon dubbed \"conformity.\" We argue for the need to include conformity in the ELG-halo connection using galaxy models such as IllustrisTNG, and by combining observations such as the DESI ELG auto-correlation, ELG cross-correlation with Luminous Red Galaxies (LRGs), and ELG-cluster cross-correlation. We also explore the origin of conformity using the UniverseMachine model and elucidate the difference between conformity and the well-known galaxy assembly bias effect.","url_abs":"https://arxiv.org/abs/2310.09329v1","url_pdf":"https://arxiv.org/pdf/2310.09329v1.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":"unraveling-emission-line-galaxy-conformity-at","repo_url":"https://github.com/abacusorg/abacusutils","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}