{"paper":{"title":"Updating the (Supermassive Black Hole Mass) - (Spiral Arm Pitch Angle) Relation: A Strong Correlation for Galaxies with Pseudobulges","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alister W. Graham, Benjamin L. Davis, Marc S. Seigar","submitted_at":"2017-07-13T07:40:22Z","abstract_excerpt":"We have conducted an image analysis of the (current) full sample of 44 spiral galaxies with directly measured supermassive black hole (SMBH) masses, $M_{\\rm BH}$, to determine each galaxy's logarithmic spiral arm pitch angle, $\\phi$. For predicting black hole masses, we have derived the relation: $\\log({M_{\\rm BH}/{\\rm M_{\\odot}}}) = (7.01\\pm0.07) - (0.171\\pm0.017)[|\\phi|-15\\deg]$. The total root mean square scatter associated with this relation is 0.43 dex in the $\\log{M_{\\rm BH}}$ direction, with an intrinsic scatter of $0.33\\pm0.08$ dex. The $M_{\\rm BH}$-$\\phi$ relation is therefore at leas"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.04001","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}