{"paper":{"title":"Reverberation in the Narrow Fe K${\\alpha}$ Line in the Seyfert Galaxy NGC 4151 with XRISM","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"(10) ESA/ESTEC, (11) Univ. of Tokyo, (12) University of Geneva), (2) Univ. of Maryland, 3, (3) NASA HEASARC, 4), (4) CRESST, (5) SRON, (6) Technion, (7) Center for Astrophysics, 8), (8) University of Amsterdam, (9) Saint Mary's University, Aberahmen Zoghbi (2, College Park, Doyee Byun (1), Ehud Behar (6), Elisa Costantini (5, Harvard-Smithsonian, Jon M. Miller (1), Laura Brenneman (7), Liyi Gu (5), Luigi Gallo (9), Matteo Guainazzi (10), Missagh Mehdipour (1), NASA/GSFC, Peter Kosec (7), Stephane Paltani (12) ((1) Univ. of Michigan, Takeo Minezaki (11), Xin Xiang (1)","submitted_at":"2026-06-22T14:12:08Z","abstract_excerpt":"Emission lines that \"echo\" variations in the ionizing flux produced close to black holes are powerful probes of the central engine. In the Seyfert-1.5 galaxy NGC 4151, high-resolution X-ray spectra and time lags in low-resolution X-ray data suggest that part of the narrow Fe K$_{\\alpha}$ line originates close to the optical broad line region (BLR). We report on a sequence of nine XRISM observations of NGC 4151, obtained every other day in 2024. Swift monitoring was undertaken to sample the driving flux before, during, and after the XRISM sequence. Using suitable line kernels, we measure a mean"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.23384","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/2606.23384/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"}