{"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/census-of-the-local-universe-clu-narrow-band","title":"Census of the Local Universe (CLU) Narrow-Band Survey I: Galaxy Catalogs from Preliminary Fields","arxiv_id":"1710.05016","date":"2017-10-13","proceeding":null,"authors":["David O. Cook","Mansi M. Kasliwal","Angela Van Sistine","David L. Kaplan","Jessica S. Sutter","Thomas Kupfer","David L. Shupe","Russ R. Laher","Frank J. Masci","Daniel A. Dale","Branimir Sesar","Patrick R. Brady","Lin Yan","Eran O. Ofek","David H. Reitze","Shrinivas R. Kulkarni"],"abstract":"We present the Census of the Local Universe (CLU) narrow-band survey to search for emission-line (\\ha) galaxies. CLU-\\ha~has imaged $\\approx$3$\\pi$ of the sky (26,470~deg$^2$) with 4 narrow-band filters that probe a distance out to 200~Mpc. We have obtained spectroscopic follow-up for galaxy candidates in 14 preliminary fields (101.6~deg$^2$) to characterize the limits and completeness of the survey. In these preliminary fields, CLU can identify emission lines down to an \\ha~flux limit of $10^{-14}$~$\\rm{erg~s^{-1}~cm^{-2}}$ at 90\\% completeness, and recovers 83\\% (67\\%) of the \\ha~flux from catalogued galaxies in our search volume at the $\\Sigma$=2.5 ($\\Sigma$=5) color excess levels. The contamination from galaxies with no emission lines is 61\\% (12\\%) for $\\Sigma$=2.5 ($\\Sigma$=5). Also, in the regions of overlap between our preliminary fields and previous emission-line surveys, we recover the majority of the galaxies found in previous surveys and identify an additional $\\approx$300 galaxies. In total, we find 90 galaxies with no previous distance information, several of which are interesting objects: 7 blue compact dwarfs, 1 green pea, and a Seyfert galaxy; we also identified a known planetary nebula. These objects show that the CLU-\\ha~survey can be a discovery machine for objects in our own Galaxy and extreme galaxies out to intermediate redshifts. However, the majority of the CLU-\\ha~galaxies identified in this work show properties consistent with normal star-forming galaxies. CLU-\\ha~galaxies with new redshifts will be added to existing galaxy catalogs to focus the search for the electromagnetic counterpart to gravitational wave events.","url_abs":"https://arxiv.org/abs/1710.05016v2","url_pdf":"https://arxiv.org/pdf/1710.05016v2.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":"census-of-the-local-universe-clu-narrow-band","repo_url":"https://github.com/mcoughlin/ztf_summer_school_2021","is_official":0,"mentioned_in_paper":0,"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}