{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2008:KGO7MKV34L2HY2WXK23T737HTU","short_pith_number":"pith:KGO7MKV3","schema_version":"1.0","canonical_sha256":"519df62abbe2f47c6ad756b73fefe79d285a2ab22820c5a6169c9c3b0f1e53b7","source":{"kind":"arxiv","id":"0811.4345","version":1},"attestation_state":"computed","paper":{"title":"The Megamaser Cosmology Project: I. VLBI observations of UGC 3789","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C. Henkel, J. A. Braatz, J. J. Condon, K. Y. Lo, L. J. Greenhill, M. J. Reid","submitted_at":"2008-11-26T15:30:15Z","abstract_excerpt":"The Megamaser Cosmology Project (MCP) seeks to measure the Hubble Constant (Ho) in order to improve the extragalactic distance scale and constrain the nature of dark energy. We are searching for sources of water maser emission from AGN with sub-pc accretion disks, as in NGC 4258, and following up these discoveries with Very Long Baseline Interferometric (VLBI) imaging and spectral monitoring. Here we present a VLBI map of the water masers toward UGC 3789, a galaxy well into the Hubble Flow. We have observed masers moving at rotational speeds up to 800 km/s at radii as small as 0.08 pc. Our map"},"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":"0811.4345","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-11-26T15:30:15Z","cross_cats_sorted":[],"title_canon_sha256":"e55d110587a2addc12dd649a40e96635e9c06fe32c9b675918278b0d62dd0e8b","abstract_canon_sha256":"3ffb514a038bb2964d12ff1a5e4ababa433fb770af6b73ad06f321c65c3c32e1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:24.859862Z","signature_b64":"1KfyoW1NQnu245AdYrUMU96qkPuATRDZWZ6/mHvdRR/lKR5CJwzB7vdPEXnJXi3L0aFPqtVqgtuXXBW93IYICA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"519df62abbe2f47c6ad756b73fefe79d285a2ab22820c5a6169c9c3b0f1e53b7","last_reissued_at":"2026-05-18T04:29:24.859321Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:24.859321Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Megamaser Cosmology Project: I. VLBI observations of UGC 3789","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C. Henkel, J. A. Braatz, J. J. Condon, K. Y. Lo, L. J. Greenhill, M. J. Reid","submitted_at":"2008-11-26T15:30:15Z","abstract_excerpt":"The Megamaser Cosmology Project (MCP) seeks to measure the Hubble Constant (Ho) in order to improve the extragalactic distance scale and constrain the nature of dark energy. We are searching for sources of water maser emission from AGN with sub-pc accretion disks, as in NGC 4258, and following up these discoveries with Very Long Baseline Interferometric (VLBI) imaging and spectral monitoring. Here we present a VLBI map of the water masers toward UGC 3789, a galaxy well into the Hubble Flow. We have observed masers moving at rotational speeds up to 800 km/s at radii as small as 0.08 pc. Our map"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0811.4345","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":"0811.4345","created_at":"2026-05-18T04:29:24.859409+00:00"},{"alias_kind":"arxiv_version","alias_value":"0811.4345v1","created_at":"2026-05-18T04:29:24.859409+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0811.4345","created_at":"2026-05-18T04:29:24.859409+00:00"},{"alias_kind":"pith_short_12","alias_value":"KGO7MKV34L2H","created_at":"2026-05-18T12:25:57.157939+00:00"},{"alias_kind":"pith_short_16","alias_value":"KGO7MKV34L2HY2WX","created_at":"2026-05-18T12:25:57.157939+00:00"},{"alias_kind":"pith_short_8","alias_value":"KGO7MKV3","created_at":"2026-05-18T12:25:57.157939+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/KGO7MKV34L2HY2WXK23T737HTU","json":"https://pith.science/pith/KGO7MKV34L2HY2WXK23T737HTU.json","graph_json":"https://pith.science/api/pith-number/KGO7MKV34L2HY2WXK23T737HTU/graph.json","events_json":"https://pith.science/api/pith-number/KGO7MKV34L2HY2WXK23T737HTU/events.json","paper":"https://pith.science/paper/KGO7MKV3"},"agent_actions":{"view_html":"https://pith.science/pith/KGO7MKV34L2HY2WXK23T737HTU","download_json":"https://pith.science/pith/KGO7MKV34L2HY2WXK23T737HTU.json","view_paper":"https://pith.science/paper/KGO7MKV3","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0811.4345&json=true","fetch_graph":"https://pith.science/api/pith-number/KGO7MKV34L2HY2WXK23T737HTU/graph.json","fetch_events":"https://pith.science/api/pith-number/KGO7MKV34L2HY2WXK23T737HTU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/KGO7MKV34L2HY2WXK23T737HTU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/KGO7MKV34L2HY2WXK23T737HTU/action/storage_attestation","attest_author":"https://pith.science/pith/KGO7MKV34L2HY2WXK23T737HTU/action/author_attestation","sign_citation":"https://pith.science/pith/KGO7MKV34L2HY2WXK23T737HTU/action/citation_signature","submit_replication":"https://pith.science/pith/KGO7MKV34L2HY2WXK23T737HTU/action/replication_record"}},"created_at":"2026-05-18T04:29:24.859409+00:00","updated_at":"2026-05-18T04:29:24.859409+00:00"}