{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:I5FVPQVY2U7J7G234DBZDU4QNL","short_pith_number":"pith:I5FVPQVY","canonical_record":{"source":{"id":"1006.5409","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-06-28T17:09:40Z","cross_cats_sorted":[],"title_canon_sha256":"f6b844dfdbd7c5cbbf42e0dc5462ead47388d7d4129c62d809466d32daa15fcf","abstract_canon_sha256":"8880323dd6c141bc1cd2177e908239d26618d9ca0fc4512565709a5c69888dc3"},"schema_version":"1.0"},"canonical_sha256":"474b57c2b8d53e9f9b5be0c391d3906acf1cfa3820dfb1de6a75e3f4b89f940c","source":{"kind":"arxiv","id":"1006.5409","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1006.5409","created_at":"2026-05-18T02:06:34Z"},{"alias_kind":"arxiv_version","alias_value":"1006.5409v1","created_at":"2026-05-18T02:06:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1006.5409","created_at":"2026-05-18T02:06:34Z"},{"alias_kind":"pith_short_12","alias_value":"I5FVPQVY2U7J","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"I5FVPQVY2U7J7G23","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"I5FVPQVY","created_at":"2026-05-18T12:26:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:I5FVPQVY2U7J7G234DBZDU4QNL","target":"record","payload":{"canonical_record":{"source":{"id":"1006.5409","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-06-28T17:09:40Z","cross_cats_sorted":[],"title_canon_sha256":"f6b844dfdbd7c5cbbf42e0dc5462ead47388d7d4129c62d809466d32daa15fcf","abstract_canon_sha256":"8880323dd6c141bc1cd2177e908239d26618d9ca0fc4512565709a5c69888dc3"},"schema_version":"1.0"},"canonical_sha256":"474b57c2b8d53e9f9b5be0c391d3906acf1cfa3820dfb1de6a75e3f4b89f940c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:06:34.825714Z","signature_b64":"J6vPb0MAFvGJE4tILq3vGFKcvdSeggKtK+vODBN0ly26hAFqpoSTn995HqhQ6bSksFEIEPC0bg7uzEaoTAXbAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"474b57c2b8d53e9f9b5be0c391d3906acf1cfa3820dfb1de6a75e3f4b89f940c","last_reissued_at":"2026-05-18T02:06:34.825100Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:06:34.825100Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1006.5409","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":"2026-05-18T02:06:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8hXZiHMXwS8LSzUMOSX5jqjsJl6uvMo8caIYc4WNg73ul/kb/tWJjhgBI0s/359za7RFGzSypOS6Ce+hJyWhCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:57:51.884727Z"},"content_sha256":"a4170a18bcc2709b6efe107a46901d20964745d38fb90744000ccbe9de12145b","schema_version":"1.0","event_id":"sha256:a4170a18bcc2709b6efe107a46901d20964745d38fb90744000ccbe9de12145b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:I5FVPQVY2U7J7G234DBZDU4QNL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A large 12C/13C isotopic ratio in M82 and NGC253","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"J. Martin-Pintado, R. Aladro, R. Mauersberger, Sergio Martin","submitted_at":"2010-06-28T17:09:40Z","abstract_excerpt":"To derive carbon isotopic ratios from optically thin tracers in the central regions of the starburst galaxies M82 and NGC253. We present high sensitivity observations of CCH and two of its 13C isotopologues, C13CH and 13CCH, as well as the optically thin emission from C18O and 13C18O. We assume the column density ratio between isotopologues is representative of the 12C13C isotopic ratio. From CCH, lower limits to the 12C/13C isotopic ratio of 138 in M82, and 81 in NGC253, are derived. Lower limits to the 12C/13C ratios from CO isotopologues support these. 13C18O is tentatively detected in NGC2"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1006.5409","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":"2026-05-18T02:06:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ykepW/eQVddc3Ej9u21GdnB9e1ffSLpXV+lax1Mng6aGEpAnyAMSjd0GezJXbE/kPqELlrhgOTTHRn7YFHX4Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:57:51.885087Z"},"content_sha256":"d58997e9ad8b4a1380675a03942787e076942fc48835fc854ce2979e822dae34","schema_version":"1.0","event_id":"sha256:d58997e9ad8b4a1380675a03942787e076942fc48835fc854ce2979e822dae34"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I5FVPQVY2U7J7G234DBZDU4QNL/bundle.json","state_url":"https://pith.science/pith/I5FVPQVY2U7J7G234DBZDU4QNL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I5FVPQVY2U7J7G234DBZDU4QNL/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":"2026-05-30T11:57:51Z","links":{"resolver":"https://pith.science/pith/I5FVPQVY2U7J7G234DBZDU4QNL","bundle":"https://pith.science/pith/I5FVPQVY2U7J7G234DBZDU4QNL/bundle.json","state":"https://pith.science/pith/I5FVPQVY2U7J7G234DBZDU4QNL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I5FVPQVY2U7J7G234DBZDU4QNL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:I5FVPQVY2U7J7G234DBZDU4QNL","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":"8880323dd6c141bc1cd2177e908239d26618d9ca0fc4512565709a5c69888dc3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-06-28T17:09:40Z","title_canon_sha256":"f6b844dfdbd7c5cbbf42e0dc5462ead47388d7d4129c62d809466d32daa15fcf"},"schema_version":"1.0","source":{"id":"1006.5409","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1006.5409","created_at":"2026-05-18T02:06:34Z"},{"alias_kind":"arxiv_version","alias_value":"1006.5409v1","created_at":"2026-05-18T02:06:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1006.5409","created_at":"2026-05-18T02:06:34Z"},{"alias_kind":"pith_short_12","alias_value":"I5FVPQVY2U7J","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_16","alias_value":"I5FVPQVY2U7J7G23","created_at":"2026-05-18T12:26:07Z"},{"alias_kind":"pith_short_8","alias_value":"I5FVPQVY","created_at":"2026-05-18T12:26:07Z"}],"graph_snapshots":[{"event_id":"sha256:d58997e9ad8b4a1380675a03942787e076942fc48835fc854ce2979e822dae34","target":"graph","created_at":"2026-05-18T02:06:34Z","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":"To derive carbon isotopic ratios from optically thin tracers in the central regions of the starburst galaxies M82 and NGC253. We present high sensitivity observations of CCH and two of its 13C isotopologues, C13CH and 13CCH, as well as the optically thin emission from C18O and 13C18O. We assume the column density ratio between isotopologues is representative of the 12C13C isotopic ratio. From CCH, lower limits to the 12C/13C isotopic ratio of 138 in M82, and 81 in NGC253, are derived. Lower limits to the 12C/13C ratios from CO isotopologues support these. 13C18O is tentatively detected in NGC2","authors_text":"J. Martin-Pintado, R. Aladro, R. Mauersberger, Sergio Martin","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-06-28T17:09:40Z","title":"A large 12C/13C isotopic ratio in M82 and NGC253"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1006.5409","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:a4170a18bcc2709b6efe107a46901d20964745d38fb90744000ccbe9de12145b","target":"record","created_at":"2026-05-18T02:06:34Z","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":"8880323dd6c141bc1cd2177e908239d26618d9ca0fc4512565709a5c69888dc3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-06-28T17:09:40Z","title_canon_sha256":"f6b844dfdbd7c5cbbf42e0dc5462ead47388d7d4129c62d809466d32daa15fcf"},"schema_version":"1.0","source":{"id":"1006.5409","kind":"arxiv","version":1}},"canonical_sha256":"474b57c2b8d53e9f9b5be0c391d3906acf1cfa3820dfb1de6a75e3f4b89f940c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"474b57c2b8d53e9f9b5be0c391d3906acf1cfa3820dfb1de6a75e3f4b89f940c","first_computed_at":"2026-05-18T02:06:34.825100Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:06:34.825100Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"J6vPb0MAFvGJE4tILq3vGFKcvdSeggKtK+vODBN0ly26hAFqpoSTn995HqhQ6bSksFEIEPC0bg7uzEaoTAXbAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:06:34.825714Z","signed_message":"canonical_sha256_bytes"},"source_id":"1006.5409","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a4170a18bcc2709b6efe107a46901d20964745d38fb90744000ccbe9de12145b","sha256:d58997e9ad8b4a1380675a03942787e076942fc48835fc854ce2979e822dae34"],"state_sha256":"0d5a034d187033e7af987fdd9bf7cc502e4ed86b833a0cea75abe45043cea687"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9McbJ6h6oWEsspERKrQJBlD1AsIoehbxq9kSf3+c4YOfXrgtzWXidl6VXzcO8uqs/RO4iJQJGJWhvG9/b+DPDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T11:57:51.887420Z","bundle_sha256":"757f1802fea403ddebde5e1b931aaba3a1e25fcb3994b00936e03556bee6a0ca"}}