{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:APWK75EKFFNJYTWNUNEWEKQPIF","short_pith_number":"pith:APWK75EK","canonical_record":{"source":{"id":"0809.3446","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-09-19T19:54:32Z","cross_cats_sorted":[],"title_canon_sha256":"a08ba05cb6f38a1aa9270bd916ed496604a5a0200dc4d6d5832558ae5ddb9fe5","abstract_canon_sha256":"5b7e1ef74bb3437bb45750d7dbb81fc330eb061771e5bed21e3f4c77542783b2"},"schema_version":"1.0"},"canonical_sha256":"03ecaff48a295a9c4ecda349622a0f41433a250da61318cb990420db2cb53820","source":{"kind":"arxiv","id":"0809.3446","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0809.3446","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"arxiv_version","alias_value":"0809.3446v2","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0809.3446","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"pith_short_12","alias_value":"APWK75EKFFNJ","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"APWK75EKFFNJYTWN","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"APWK75EK","created_at":"2026-05-18T12:25:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:APWK75EKFFNJYTWNUNEWEKQPIF","target":"record","payload":{"canonical_record":{"source":{"id":"0809.3446","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-09-19T19:54:32Z","cross_cats_sorted":[],"title_canon_sha256":"a08ba05cb6f38a1aa9270bd916ed496604a5a0200dc4d6d5832558ae5ddb9fe5","abstract_canon_sha256":"5b7e1ef74bb3437bb45750d7dbb81fc330eb061771e5bed21e3f4c77542783b2"},"schema_version":"1.0"},"canonical_sha256":"03ecaff48a295a9c4ecda349622a0f41433a250da61318cb990420db2cb53820","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:15:34.160017Z","signature_b64":"GxiCKZOH5bcmNUud1kxDKSqSKKdW9duBQlh0Tb6HuHyKwnOZatYMmzoBse63QJeK6MhjFecTOD38cNrra4YCDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"03ecaff48a295a9c4ecda349622a0f41433a250da61318cb990420db2cb53820","last_reissued_at":"2026-05-18T02:15:34.159299Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:15:34.159299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0809.3446","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:15:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aErW9UOCzoOvrl0/SABOg9uE36ybH96SjhX/ymxz/ZiHZvPCLl4LAz4xFuJqsMwDwijVRqHsSTLeRsN1G5RJBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T20:47:55.203435Z"},"content_sha256":"ffacf5c8e446e14a56d455b607d6b20abab044e9ac6cb8c40f4e9509c4b1b075","schema_version":"1.0","event_id":"sha256:ffacf5c8e446e14a56d455b607d6b20abab044e9ac6cb8c40f4e9509c4b1b075"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:APWK75EKFFNJYTWNUNEWEKQPIF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"SDSSJ092712.65+294344.0: a candidate massive black hole binary","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C. Montuori, F. Haardt, M. Colpi, M. Dotti, M. Volonteri, R. Decarli","submitted_at":"2008-09-19T19:54:32Z","abstract_excerpt":"In this Letter we explore the hypothesis that the quasar SDSSJ092712.65+294344.0 is hosting a massive black hole binary embedded in a circumbinary disc. The lightest, secondary black hole is active, and gas orbiting around it is responsible for the blue-shifted broad emission lines with velocity off-set of 2650 km/s, relative to the galaxy rest frame. As the tidal interaction of the binary with the outer disc is expected to excavate a gap, the blue-shifted narrow emission lines are consistent with being emitted from the low-density inhomogeneous gas of the hollow region. From the observations "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0809.3446","kind":"arxiv","version":2},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:15:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fmBrEJ06wnB9X0WzV3a2zaqi/Tj6B00FYmf6hZ6ql+6mvVZ75SVRGnD+wVG8/uOiFwCVDjRUs8Hme7wVaQksDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T20:47:55.204107Z"},"content_sha256":"be43a1e2c2d28388eccb8ca5f5e81e479b02fa26b2f6dc5632cd821dc00b4d4b","schema_version":"1.0","event_id":"sha256:be43a1e2c2d28388eccb8ca5f5e81e479b02fa26b2f6dc5632cd821dc00b4d4b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/APWK75EKFFNJYTWNUNEWEKQPIF/bundle.json","state_url":"https://pith.science/pith/APWK75EKFFNJYTWNUNEWEKQPIF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/APWK75EKFFNJYTWNUNEWEKQPIF/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-31T20:47:55Z","links":{"resolver":"https://pith.science/pith/APWK75EKFFNJYTWNUNEWEKQPIF","bundle":"https://pith.science/pith/APWK75EKFFNJYTWNUNEWEKQPIF/bundle.json","state":"https://pith.science/pith/APWK75EKFFNJYTWNUNEWEKQPIF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/APWK75EKFFNJYTWNUNEWEKQPIF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:APWK75EKFFNJYTWNUNEWEKQPIF","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"5b7e1ef74bb3437bb45750d7dbb81fc330eb061771e5bed21e3f4c77542783b2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-09-19T19:54:32Z","title_canon_sha256":"a08ba05cb6f38a1aa9270bd916ed496604a5a0200dc4d6d5832558ae5ddb9fe5"},"schema_version":"1.0","source":{"id":"0809.3446","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0809.3446","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"arxiv_version","alias_value":"0809.3446v2","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0809.3446","created_at":"2026-05-18T02:15:34Z"},{"alias_kind":"pith_short_12","alias_value":"APWK75EKFFNJ","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"APWK75EKFFNJYTWN","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"APWK75EK","created_at":"2026-05-18T12:25:56Z"}],"graph_snapshots":[{"event_id":"sha256:be43a1e2c2d28388eccb8ca5f5e81e479b02fa26b2f6dc5632cd821dc00b4d4b","target":"graph","created_at":"2026-05-18T02:15:34Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"In this Letter we explore the hypothesis that the quasar SDSSJ092712.65+294344.0 is hosting a massive black hole binary embedded in a circumbinary disc. The lightest, secondary black hole is active, and gas orbiting around it is responsible for the blue-shifted broad emission lines with velocity off-set of 2650 km/s, relative to the galaxy rest frame. As the tidal interaction of the binary with the outer disc is expected to excavate a gap, the blue-shifted narrow emission lines are consistent with being emitted from the low-density inhomogeneous gas of the hollow region. From the observations ","authors_text":"C. Montuori, F. Haardt, M. Colpi, M. Dotti, M. Volonteri, R. Decarli","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-09-19T19:54:32Z","title":"SDSSJ092712.65+294344.0: a candidate massive black hole binary"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0809.3446","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:ffacf5c8e446e14a56d455b607d6b20abab044e9ac6cb8c40f4e9509c4b1b075","target":"record","created_at":"2026-05-18T02:15:34Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"5b7e1ef74bb3437bb45750d7dbb81fc330eb061771e5bed21e3f4c77542783b2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-09-19T19:54:32Z","title_canon_sha256":"a08ba05cb6f38a1aa9270bd916ed496604a5a0200dc4d6d5832558ae5ddb9fe5"},"schema_version":"1.0","source":{"id":"0809.3446","kind":"arxiv","version":2}},"canonical_sha256":"03ecaff48a295a9c4ecda349622a0f41433a250da61318cb990420db2cb53820","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"03ecaff48a295a9c4ecda349622a0f41433a250da61318cb990420db2cb53820","first_computed_at":"2026-05-18T02:15:34.159299Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:34.159299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GxiCKZOH5bcmNUud1kxDKSqSKKdW9duBQlh0Tb6HuHyKwnOZatYMmzoBse63QJeK6MhjFecTOD38cNrra4YCDw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:34.160017Z","signed_message":"canonical_sha256_bytes"},"source_id":"0809.3446","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ffacf5c8e446e14a56d455b607d6b20abab044e9ac6cb8c40f4e9509c4b1b075","sha256:be43a1e2c2d28388eccb8ca5f5e81e479b02fa26b2f6dc5632cd821dc00b4d4b"],"state_sha256":"c5a445b9992f3b70f0a5097f5584aff8c8089df8935bfd19bba532537e501344"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Cx4KUCgW3+T2j8PV2TVsAk/ef19w2/TkzS6vkjklFKst5v2NcOEnqqam3lJaf3cWvo+NPW2n4vCVz+GDHFsJAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T20:47:55.207872Z","bundle_sha256":"cc716b28038b91bff11d92747fcd37e9369d09ac3e09ef66893d8096d23f77f8"}}