{"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/a-census-of-photometrically-selected-little","title":"A Census of Photometrically Selected Little Red Dots at 4 < z < 9 in JWST Blank Fields","arxiv_id":"2401.09981","date":"2024-01-18","proceeding":null,"authors":["Vasily Kokorev","Karina I. Caputi","Jenny E. Greene","Pratika Dayal","Maxime Trebitsch","Sam E. Cutler","Seiji Fujimoto","Ivo Labbé","Tim B. Miller","Edoardo Iani","Rafael Navarro-Carrera","Pierluigi Rinaldi"],"abstract":"Observations with the James Webb Space Telescope (JWST) have uncovered numerous faint active galactic nuclei (AGN) at $z\\sim5$ and beyond. These objects are key to our understanding of the formation of supermassive black holes (SMBHs), their co-evolution with host galaxies, as well as the role of AGN in cosmic reionization. Using photometric colors and size measurements, we perform a search for compact red objects in an array of blank deep JWST/NIRCam fields totaling $\\sim640$ arcmin$^{2}$. Our careful selection yields 260 reddened AGN candidates at $4<z_{\\rm phot}<9$, dominated by a point-source like central component ($\\langle r_{\\rm eff} \\rangle <130$ pc) and displaying a dichotomy in their rest-frame colors (blue UV and red optical slopes). Quasar model fitting reveals our objects to be moderately dust extincted ($A_{\\rm V}\\sim1.6$), which is reflected in their inferred bolometric luminosities of $L_{\\rm bol}$ = 10$^{44-47}$ erg/s, and fainter UV magnitudes $M_{\\rm UV} \\simeq$ $-17$ to $-22$. Thanks to the large areas explored, we extend the existing dusty AGN luminosity functions to both fainter and brighter magnitudes, estimating their number densities to be $\\times100$ higher than for UV-selected quasars of similar magnitudes. At the same time they constitute only a small fraction of all UV-selected galaxies at similar redshifts, but this percentage rises to $\\sim$10\\% for $M_{UV}\\sim -22$ at $z\\sim7$. Finally, assuming a conservative case of accretion at the Eddington rate, we place a lower limit on the SMBH mass function at $z\\sim5$, finding it to be consistent with both theory and previous JWST observations.","url_abs":"https://arxiv.org/abs/2401.09981v4","url_pdf":"https://arxiv.org/pdf/2401.09981v4.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":"a-census-of-photometrically-selected-little","repo_url":"https://github.com/vasilykokorev/lrd_phot","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}