{"paper":{"title":"New black hole mass calibrations and the fundamental plane of the broad-line region size, luminosity, and velocity","license":"http://creativecommons.org/licenses/by/4.0/","headline":"A three-parameter fundamental plane for broad-line region size, luminosity, and velocity yields new black hole mass estimators that lower previous values by up to 0.5 dex.","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Hojin Cho, Jimin Kim, Jong-Hak Woo, Shu Wang","submitted_at":"2026-03-07T05:55:52Z","abstract_excerpt":"We present a new calibration of the broad-line region (BLR) size-luminosity-velocity relation using a sample of 157 AGNs with reliable Hbeta time-delay (\\lag) measurements from Wang & Woo 2024. By incorporating the Eddington ratio as a third parameter, we effectively correct the systematic offset of high-Eddington AGNs in the traditional BLR size-luminosity relation. The resulting three-parameter fit defines a fundamental plane in the 3-D space of the \\lag, optical luminosity, and Hbeta velocity, with an intrinsic scatter of 0.21 dex. This tight correlation reflects the coupled effects of gas "},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"the new mass estimator substantially changes the cosmic black hole mass density and the growth of black hole seeds in the early universe","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the Eddington ratio correction derived from the 157-AGN sample fully removes systematic offsets and applies to the broader AGN population without residual selection or measurement biases","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A new fundamental plane for AGN BLR size-luminosity-velocity incorporating Eddington ratio yields single-epoch black hole mass estimators with 0.21 dex scatter, reducing prior overestimates by up to 0.5 dex.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A three-parameter fundamental plane for broad-line region size, luminosity, and velocity yields new black hole mass estimators that lower previous values by up to 0.5 dex.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"61bb703983644c5971216da1b47acadfb2c7fe5415a0b40c824648f2019f23ac"},"source":{"id":"2603.07047","kind":"arxiv","version":3},"verdict":{"id":"7ef8026e-6d65-4374-8f3b-052dd500141f","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T15:17:39.297152Z","strongest_claim":"the new mass estimator substantially changes the cosmic black hole mass density and the growth of black hole seeds in the early universe","one_line_summary":"A new fundamental plane for AGN BLR size-luminosity-velocity incorporating Eddington ratio yields single-epoch black hole mass estimators with 0.21 dex scatter, reducing prior overestimates by up to 0.5 dex.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the Eddington ratio correction derived from the 157-AGN sample fully removes systematic offsets and applies to the broader AGN population without residual selection or measurement biases","pith_extraction_headline":"A three-parameter fundamental plane for broad-line region size, luminosity, and velocity yields new black hole mass estimators that lower previous values by up to 0.5 dex."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2603.07047/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":2,"snapshot_sha256":"4f6b014fd3dbcd9b9d192e0ab633d28b8d6acd0d0e835cd60049d8108f0504db"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}