{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:EBJPADQF4NU2SG27VKGDK2LGTO","short_pith_number":"pith:EBJPADQF","canonical_record":{"source":{"id":"1310.8429","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-10-31T09:03:39Z","cross_cats_sorted":[],"title_canon_sha256":"7b21ecad4f49eef4dfdb291320f56c56507f51cdaaa889977040cefb2e7d71ca","abstract_canon_sha256":"03d0eea3faa116e39bfe15ac90458ea1f7e644c65b592739bf9d323ca8ac2dee"},"schema_version":"1.0"},"canonical_sha256":"2052f00e05e369a91b5faa8c3569669b9acf702e143d99fa27b1d788f2159bf3","source":{"kind":"arxiv","id":"1310.8429","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.8429","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"arxiv_version","alias_value":"1310.8429v1","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.8429","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"pith_short_12","alias_value":"EBJPADQF4NU2","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_16","alias_value":"EBJPADQF4NU2SG27","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_8","alias_value":"EBJPADQF","created_at":"2026-05-18T12:27:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:EBJPADQF4NU2SG27VKGDK2LGTO","target":"record","payload":{"canonical_record":{"source":{"id":"1310.8429","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-10-31T09:03:39Z","cross_cats_sorted":[],"title_canon_sha256":"7b21ecad4f49eef4dfdb291320f56c56507f51cdaaa889977040cefb2e7d71ca","abstract_canon_sha256":"03d0eea3faa116e39bfe15ac90458ea1f7e644c65b592739bf9d323ca8ac2dee"},"schema_version":"1.0"},"canonical_sha256":"2052f00e05e369a91b5faa8c3569669b9acf702e143d99fa27b1d788f2159bf3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:46:40.642229Z","signature_b64":"N085TZrKMzNCF/SsvHKUBxaTunAvXlmnp6vzv16Ouf5o+hBV4JIyHWmlPdlEXIqPT4ZZNRvsPcEcKL5j15cvAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2052f00e05e369a91b5faa8c3569669b9acf702e143d99fa27b1d788f2159bf3","last_reissued_at":"2026-05-18T01:46:40.641342Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:46:40.641342Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1310.8429","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:46:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jTUEAV1mN2iP8Imqlsus8QlvmfBNFtqf1LqVvXowbAYbxYHB+tb3vj69+y8H0vUjpSHrOhcnN93hagxAPhYiCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T16:38:06.849088Z"},"content_sha256":"3f61bea6b7f43c49ad6882a10f7376a291e71abd0d68c3bba89a18e2596e98ff","schema_version":"1.0","event_id":"sha256:3f61bea6b7f43c49ad6882a10f7376a291e71abd0d68c3bba89a18e2596e98ff"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:EBJPADQF4NU2SG27VKGDK2LGTO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An analysis of HCN observations of the Circumnuclear Disk at the galactic centre","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Ian L Smith, Mark Wardle","submitted_at":"2013-10-31T09:03:39Z","abstract_excerpt":"The Circumnuclear Disk (CND) is a torus of dust and molecular gas rotating about the galactic centre and extending from approximately 1.6pc to 7pc from the central massive black hole, SgrA*. Large Velocity Gradient modelling of the intensities of the HCN 1-0, 3-2 and 4-3 transitions is used to infer hydrogen density and HCN optical depth. From HCN observations we find the molecular hydrogen density ranges from 0.1 to 2 $\\times$ 10$^{6}$ cm$^{-3}$, about an order of magnitude less than inferred previously. The 1-0 line is weakly inverted with line-centre optical depth approx $-$0.1, in stark co"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.8429","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:46:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OTqbXtPIUv8y2VQACYb5bfXg2RTybidIHlIVjYH7cXaVihRGVIVs9jC4YZCT1oXjHXHdQdsfFxAc34V5n9/tCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T16:38:06.849447Z"},"content_sha256":"045faeb57faa43ee00efd23a3a43db178e33c460f63be95fcba5c4e64d5e6793","schema_version":"1.0","event_id":"sha256:045faeb57faa43ee00efd23a3a43db178e33c460f63be95fcba5c4e64d5e6793"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EBJPADQF4NU2SG27VKGDK2LGTO/bundle.json","state_url":"https://pith.science/pith/EBJPADQF4NU2SG27VKGDK2LGTO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EBJPADQF4NU2SG27VKGDK2LGTO/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":"2026-05-19T16:38:06Z","links":{"resolver":"https://pith.science/pith/EBJPADQF4NU2SG27VKGDK2LGTO","bundle":"https://pith.science/pith/EBJPADQF4NU2SG27VKGDK2LGTO/bundle.json","state":"https://pith.science/pith/EBJPADQF4NU2SG27VKGDK2LGTO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EBJPADQF4NU2SG27VKGDK2LGTO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:EBJPADQF4NU2SG27VKGDK2LGTO","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":"03d0eea3faa116e39bfe15ac90458ea1f7e644c65b592739bf9d323ca8ac2dee","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-10-31T09:03:39Z","title_canon_sha256":"7b21ecad4f49eef4dfdb291320f56c56507f51cdaaa889977040cefb2e7d71ca"},"schema_version":"1.0","source":{"id":"1310.8429","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.8429","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"arxiv_version","alias_value":"1310.8429v1","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.8429","created_at":"2026-05-18T01:46:40Z"},{"alias_kind":"pith_short_12","alias_value":"EBJPADQF4NU2","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_16","alias_value":"EBJPADQF4NU2SG27","created_at":"2026-05-18T12:27:43Z"},{"alias_kind":"pith_short_8","alias_value":"EBJPADQF","created_at":"2026-05-18T12:27:43Z"}],"graph_snapshots":[{"event_id":"sha256:045faeb57faa43ee00efd23a3a43db178e33c460f63be95fcba5c4e64d5e6793","target":"graph","created_at":"2026-05-18T01:46:40Z","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":"The Circumnuclear Disk (CND) is a torus of dust and molecular gas rotating about the galactic centre and extending from approximately 1.6pc to 7pc from the central massive black hole, SgrA*. Large Velocity Gradient modelling of the intensities of the HCN 1-0, 3-2 and 4-3 transitions is used to infer hydrogen density and HCN optical depth. From HCN observations we find the molecular hydrogen density ranges from 0.1 to 2 $\\times$ 10$^{6}$ cm$^{-3}$, about an order of magnitude less than inferred previously. The 1-0 line is weakly inverted with line-centre optical depth approx $-$0.1, in stark co","authors_text":"Ian L Smith, Mark Wardle","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-10-31T09:03:39Z","title":"An analysis of HCN observations of the Circumnuclear Disk at the galactic centre"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.8429","kind":"arxiv","version":1},"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":"sha256:3f61bea6b7f43c49ad6882a10f7376a291e71abd0d68c3bba89a18e2596e98ff","target":"record","created_at":"2026-05-18T01:46:40Z","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":"03d0eea3faa116e39bfe15ac90458ea1f7e644c65b592739bf9d323ca8ac2dee","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-10-31T09:03:39Z","title_canon_sha256":"7b21ecad4f49eef4dfdb291320f56c56507f51cdaaa889977040cefb2e7d71ca"},"schema_version":"1.0","source":{"id":"1310.8429","kind":"arxiv","version":1}},"canonical_sha256":"2052f00e05e369a91b5faa8c3569669b9acf702e143d99fa27b1d788f2159bf3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2052f00e05e369a91b5faa8c3569669b9acf702e143d99fa27b1d788f2159bf3","first_computed_at":"2026-05-18T01:46:40.641342Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:46:40.641342Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"N085TZrKMzNCF/SsvHKUBxaTunAvXlmnp6vzv16Ouf5o+hBV4JIyHWmlPdlEXIqPT4ZZNRvsPcEcKL5j15cvAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:46:40.642229Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.8429","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3f61bea6b7f43c49ad6882a10f7376a291e71abd0d68c3bba89a18e2596e98ff","sha256:045faeb57faa43ee00efd23a3a43db178e33c460f63be95fcba5c4e64d5e6793"],"state_sha256":"dfd566eaa8238c28dc37e76fd528ef21f84a4d3198ff9425ade03f2cd1a117be"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cX9Ke9GXCq9QoLiQVAbE9jEntOsW+k+QhQf04hVy5oMVImzrqLyZRJ2eiS+K7mjeNJgP1rQctk5gpVElUa4cBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T16:38:06.851531Z","bundle_sha256":"28371494f2519bc04665fffa3dd4013f93cc5f6df05b12673adb76435df59004"}}