{"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/statistical-association-between-the-candidate","title":"Statistical association between the candidate repeating FRB 20200320A and a galaxy group","arxiv_id":"2308.09608","date":"2023-08-18","proceeding":null,"authors":["Masoud Rafiei-Ravandi","Kendrick M. Smith","D. Michilli","Ziggy Pleunis","Mohit Bhardwaj","Matt Dobbs","Gwendolyn M. Eadie","Emmanuel Fonseca","B. M. Gaensler","Jane Kaczmarek","Victoria M. Kaspi","Calvin Leung","Dongzi Li","Kiyoshi W. Masui","Ayush Pandhi","Aaron B. Pearlman","Emily Petroff","Mubdi Rahman","Paul Scholz","David C. Stenning"],"abstract":"We present results from angular cross-correlations between select samples of CHIME/FRB repeaters and galaxies in three photometric galaxy surveys, which have shown correlations with the first CHIME/FRB catalog containing repeating and nonrepeating sources: WISE$\\times$SCOS, DESI-BGS, and DESI-LRG. We find a statistically significant correlation ($p$-value $<0.001$, after accounting for look-elsewhere factors) between a sample of repeaters with extragalactic dispersion measure DM $>395$ pc cm$^{-3}$ and WISE$\\times$SCOS galaxies with redshift $z>0.275$. We demonstrate that the correlation arises surprisingly because of a statistical association between FRB 20200320A (extragalactic DM $\\approx550$ pc cm$^{-3}$) and a galaxy group in the same dark matter halo at redshift $z\\approx0.32$. We estimate that the host halo, along with an intervening halo at redshift $z\\approx0.12$, accounts for at least $\\sim$$30\\%$ of the extragalactic DM. Our results strongly motivate incorporating galaxy group and cluster catalogs into direct host association pipelines for FRBs with $\\lesssim$$1'$ localization precision, effectively utilizing the two-point information to constrain FRB properties such as their redshift and DM distributions. In addition, we find marginal evidence for a negative correlation at 99.4% CL between a sample of repeating FRBs with baseband data (median extragalactic DM $=354$ pc cm$^{-3}$) and DESI-LRG galaxies with redshift $0.3\\le z<0.45$, suggesting that the repeaters might be more prone than apparent nonrepeaters to propagation effects in FRB-galaxy correlations due to intervening free electrons over angular scales $\\sim$$0\\mbox{$.\\!\\!^\\circ$}5$.","url_abs":"https://arxiv.org/abs/2308.09608v2","url_pdf":"https://arxiv.org/pdf/2308.09608v2.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":"statistical-association-between-the-candidate","repo_url":"https://github.com/mrafieir/frbx","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}