{"paper":{"title":"The missing FeII bump in faint JWST AGN: possible evidence for metal-poor broad-line regions at early cosmic times","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alesandro Marconi, Bartolomeo Trefoloni, Cosimo Marconcini, Francesco D'Eugenio, Giovanni Mazzolari, Hannah \\\"Ubler, Jan Scholtz, Roberto Maiolino, Xihan Ji","submitted_at":"2024-10-29T09:01:31Z","abstract_excerpt":"Recent JWST observations have revealed a large population of intermediate/low-luminosity AGN at early times with peculiar properties, different from local AGN or luminous quasars. To better understand the physical conditions in the BLRs of these early AGN, we used the optical FeII (4434--4684 \\AA) and the broad $\\rm H \\beta$ emission, and the ratio between their equivalent widths $R_{Fe}$, as a probe on a purposefully assembled sample. Specifically, we gathered a sample of 26 high redshift ($\\langle z \\rangle$=6.4) AGN, observed by JWST, with broad $\\rm H\\beta$ detection both in the high and l"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2410.21867","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2410.21867/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}