{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2010:QIQS6JXHPJIULQ73BH5ZCYXK5K","short_pith_number":"pith:QIQS6JXH","schema_version":"1.0","canonical_sha256":"82212f26e77a5145c3fb09fb9162eaeaad136ed926ef5c3dfa008f8011cccd61","source":{"kind":"arxiv","id":"1008.2146","version":1},"attestation_state":"computed","paper":{"title":"The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"C. Henkel, C. M. V. Impellizzeri, C. Y. Kuo, I. Zaw, J. A. Braatz, J. E. Greene, J. J. Condon, K.Y. Lo, M. J. Reid, M. Schenker","submitted_at":"2010-08-12T15:49:00Z","abstract_excerpt":"Observations of H$_2$O masers from circumnuclear disks in active galaxies for the Megamaser Cosmology Project allow accurate measurement of the mass of supermassive black holes (BH) in these galaxies. We present the Very Long Baseline Interferometry (VLBI) images and kinematics of water maser emission in six active galaxies: NGC~1194, NGC~2273, NGC~2960 (Mrk~1419), NGC~4388, NGC~6264 and NGC~6323. We use the Keplerian rotation curves of these six megamaser galaxies, plus a seventh previously published, to determine accurate enclosed masses within the central $\\sim0.3$ pc of these galaxies, sma"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1008.2146","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-12T15:49:00Z","cross_cats_sorted":[],"title_canon_sha256":"7193a464795e717b6b92a197b4e3b3144de90b644ca54a1abfa96b566bf18d14","abstract_canon_sha256":"ad9f4c7d75648e855da3ed5ec0996088c44d9eb5263fcbadacd13082f01982d9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:48.977762Z","signature_b64":"CIfh/XBw4Mw1MGngF0o4QmsNvXnBViMEInoLBL5HlDHILhBU22dOB2Yf4C+u/uOVb8PTbdiWeiPszaHO6QyMCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"82212f26e77a5145c3fb09fb9162eaeaad136ed926ef5c3dfa008f8011cccd61","last_reissued_at":"2026-05-18T02:05:48.977141Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:48.977141Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"C. Henkel, C. M. V. Impellizzeri, C. Y. Kuo, I. Zaw, J. A. Braatz, J. E. Greene, J. J. Condon, K.Y. Lo, M. J. Reid, M. Schenker","submitted_at":"2010-08-12T15:49:00Z","abstract_excerpt":"Observations of H$_2$O masers from circumnuclear disks in active galaxies for the Megamaser Cosmology Project allow accurate measurement of the mass of supermassive black holes (BH) in these galaxies. We present the Very Long Baseline Interferometry (VLBI) images and kinematics of water maser emission in six active galaxies: NGC~1194, NGC~2273, NGC~2960 (Mrk~1419), NGC~4388, NGC~6264 and NGC~6323. We use the Keplerian rotation curves of these six megamaser galaxies, plus a seventh previously published, to determine accurate enclosed masses within the central $\\sim0.3$ pc of these galaxies, sma"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.2146","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":""},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1008.2146","created_at":"2026-05-18T02:05:48.977228+00:00"},{"alias_kind":"arxiv_version","alias_value":"1008.2146v1","created_at":"2026-05-18T02:05:48.977228+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.2146","created_at":"2026-05-18T02:05:48.977228+00:00"},{"alias_kind":"pith_short_12","alias_value":"QIQS6JXHPJIU","created_at":"2026-05-18T12:26:12.377268+00:00"},{"alias_kind":"pith_short_16","alias_value":"QIQS6JXHPJIULQ73","created_at":"2026-05-18T12:26:12.377268+00:00"},{"alias_kind":"pith_short_8","alias_value":"QIQS6JXH","created_at":"2026-05-18T12:26:12.377268+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/QIQS6JXHPJIULQ73BH5ZCYXK5K","json":"https://pith.science/pith/QIQS6JXHPJIULQ73BH5ZCYXK5K.json","graph_json":"https://pith.science/api/pith-number/QIQS6JXHPJIULQ73BH5ZCYXK5K/graph.json","events_json":"https://pith.science/api/pith-number/QIQS6JXHPJIULQ73BH5ZCYXK5K/events.json","paper":"https://pith.science/paper/QIQS6JXH"},"agent_actions":{"view_html":"https://pith.science/pith/QIQS6JXHPJIULQ73BH5ZCYXK5K","download_json":"https://pith.science/pith/QIQS6JXHPJIULQ73BH5ZCYXK5K.json","view_paper":"https://pith.science/paper/QIQS6JXH","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1008.2146&json=true","fetch_graph":"https://pith.science/api/pith-number/QIQS6JXHPJIULQ73BH5ZCYXK5K/graph.json","fetch_events":"https://pith.science/api/pith-number/QIQS6JXHPJIULQ73BH5ZCYXK5K/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/QIQS6JXHPJIULQ73BH5ZCYXK5K/action/timestamp_anchor","attest_storage":"https://pith.science/pith/QIQS6JXHPJIULQ73BH5ZCYXK5K/action/storage_attestation","attest_author":"https://pith.science/pith/QIQS6JXHPJIULQ73BH5ZCYXK5K/action/author_attestation","sign_citation":"https://pith.science/pith/QIQS6JXHPJIULQ73BH5ZCYXK5K/action/citation_signature","submit_replication":"https://pith.science/pith/QIQS6JXHPJIULQ73BH5ZCYXK5K/action/replication_record"}},"created_at":"2026-05-18T02:05:48.977228+00:00","updated_at":"2026-05-18T02:05:48.977228+00:00"}