{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:AKZQLJP5D2B7VEUMJNAWPWRBPC","short_pith_number":"pith:AKZQLJP5","schema_version":"1.0","canonical_sha256":"02b305a5fd1e83fa928c4b4167da21788fd145db574527f396209d67cd2e6936","source":{"kind":"arxiv","id":"1906.11241","version":1},"attestation_state":"computed","paper":{"title":"First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM","gr-qc"],"primary_cat":"astro-ph.GA","authors_text":"The Event Horizon Telescope Collaboration","submitted_at":"2019-06-26T18:06:49Z","abstract_excerpt":"We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ~40 micro-as, consistent with the size and shape of the lensed photon orbit encircling the \"shadow\" of a supermassive black hole. The ring is persistent across four observing nights and shows enhanced brightness in the south. To assess the reliability of these results, we implemented a two-stage imaging procedure. In the first stage, four teams, each blind to the others' work, produced images of M87 using both an establ"},"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":"1906.11241","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-06-26T18:06:49Z","cross_cats_sorted":["astro-ph.IM","gr-qc"],"title_canon_sha256":"6e9225ecb348aa0f2bde4aab717db726ef5c79f3870ea89b0c9576b3a9d00ce1","abstract_canon_sha256":"4aeeb7f2c1199b9decad9587f188f109e126354a87ece2b01efb4fc2a507c8cf"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:41:24.285025Z","signature_b64":"5kVRT6Hf5IQLYKW4Haf2ob8D7j9AJ7mGHSD8tbDq81Bs560fCMSfBvqzC8InHgXlobvQmYMtakO+siLtLlxLAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"02b305a5fd1e83fa928c4b4167da21788fd145db574527f396209d67cd2e6936","last_reissued_at":"2026-05-17T23:41:24.284347Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:41:24.284347Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM","gr-qc"],"primary_cat":"astro-ph.GA","authors_text":"The Event Horizon Telescope Collaboration","submitted_at":"2019-06-26T18:06:49Z","abstract_excerpt":"We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ~40 micro-as, consistent with the size and shape of the lensed photon orbit encircling the \"shadow\" of a supermassive black hole. The ring is persistent across four observing nights and shows enhanced brightness in the south. To assess the reliability of these results, we implemented a two-stage imaging procedure. In the first stage, four teams, each blind to the others' work, produced images of M87 using both an establ"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.11241","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":"1906.11241","created_at":"2026-05-17T23:41:24.284446+00:00"},{"alias_kind":"arxiv_version","alias_value":"1906.11241v1","created_at":"2026-05-17T23:41:24.284446+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.11241","created_at":"2026-05-17T23:41:24.284446+00:00"},{"alias_kind":"pith_short_12","alias_value":"AKZQLJP5D2B7","created_at":"2026-05-18T12:33:12.712433+00:00"},{"alias_kind":"pith_short_16","alias_value":"AKZQLJP5D2B7VEUM","created_at":"2026-05-18T12:33:12.712433+00:00"},{"alias_kind":"pith_short_8","alias_value":"AKZQLJP5","created_at":"2026-05-18T12:33:12.712433+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":9,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2603.18963","citing_title":"Observational Signatures of Rotating Ay\\'{o}n-Beato-Garc\\'{i}a Black Holes: Shadows, Accretion Disks and Images","ref_index":5,"is_internal_anchor":true},{"citing_arxiv_id":"2604.25254","citing_title":"The properties and predictions of quasi-periodic oscillations around a black hole in nonlocal gravity","ref_index":9,"is_internal_anchor":false},{"citing_arxiv_id":"2604.22309","citing_title":"Effective null geodesics and black hole images in Kruglov nonlinear electrodynamics","ref_index":17,"is_internal_anchor":false},{"citing_arxiv_id":"2604.11652","citing_title":"Optical Appearance of Scalarized Kerr-Newman Black Holes with Multiple Light Rings","ref_index":2,"is_internal_anchor":false},{"citing_arxiv_id":"2604.08170","citing_title":"Thermodynamics and orbital structure of anti-de Sitter black holes in Palatini-inspired nonlinear electrodynamics","ref_index":44,"is_internal_anchor":false},{"citing_arxiv_id":"2604.14213","citing_title":"On Computational CUDA Studies of Black Hole Shadows","ref_index":8,"is_internal_anchor":false},{"citing_arxiv_id":"2604.22309","citing_title":"Effective null geodesics and black hole images in Kruglov nonlinear electrodynamics","ref_index":17,"is_internal_anchor":false},{"citing_arxiv_id":"2604.04352","citing_title":"Superradiant Suppression of Non-minimally Coupled Scalar fields for a Rotating Charged dS Black Hole in Conformal Weyl Gravity","ref_index":3,"is_internal_anchor":false},{"citing_arxiv_id":"2604.16551","citing_title":"Photon rings and shadows of black holes with non-minimal couplings between curvature and electromagnetic field","ref_index":13,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/AKZQLJP5D2B7VEUMJNAWPWRBPC","json":"https://pith.science/pith/AKZQLJP5D2B7VEUMJNAWPWRBPC.json","graph_json":"https://pith.science/api/pith-number/AKZQLJP5D2B7VEUMJNAWPWRBPC/graph.json","events_json":"https://pith.science/api/pith-number/AKZQLJP5D2B7VEUMJNAWPWRBPC/events.json","paper":"https://pith.science/paper/1906.11241"},"agent_actions":{"view_html":"https://pith.science/pith/AKZQLJP5D2B7VEUMJNAWPWRBPC","download_json":"https://pith.science/pith/AKZQLJP5D2B7VEUMJNAWPWRBPC.json","view_paper":"https://pith.science/paper/1906.11241","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1906.11241&json=true","fetch_graph":"https://pith.science/api/pith-number/AKZQLJP5D2B7VEUMJNAWPWRBPC/graph.json","fetch_events":"https://pith.science/api/pith-number/AKZQLJP5D2B7VEUMJNAWPWRBPC/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/AKZQLJP5D2B7VEUMJNAWPWRBPC/action/timestamp_anchor","attest_storage":"https://pith.science/pith/AKZQLJP5D2B7VEUMJNAWPWRBPC/action/storage_attestation","attest_author":"https://pith.science/pith/AKZQLJP5D2B7VEUMJNAWPWRBPC/action/author_attestation","sign_citation":"https://pith.science/pith/AKZQLJP5D2B7VEUMJNAWPWRBPC/action/citation_signature","submit_replication":"https://pith.science/pith/AKZQLJP5D2B7VEUMJNAWPWRBPC/action/replication_record"}},"created_at":"2026-05-17T23:41:24.284446+00:00","updated_at":"2026-05-17T23:41:24.284446+00:00"}