{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:5DXJZ4SVHNDV6MQBC3JLJVCYHP","short_pith_number":"pith:5DXJZ4SV","canonical_record":{"source":{"id":"1609.03791","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-09-13T12:21:52Z","cross_cats_sorted":[],"title_canon_sha256":"9d25d6d8d0118c32511bb987d58d363b57b1bbfbf79fb73809a8fea31458ac0d","abstract_canon_sha256":"49630296449e1607371e73a47ff26ba1435419b6337fd2db543d0df3b5acdde8"},"schema_version":"1.0"},"canonical_sha256":"e8ee9cf2553b475f320116d2b4d4583bcdc99b568becb03ee6e92aaa61eeb5d4","source":{"kind":"arxiv","id":"1609.03791","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.03791","created_at":"2026-05-18T00:47:50Z"},{"alias_kind":"arxiv_version","alias_value":"1609.03791v1","created_at":"2026-05-18T00:47:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.03791","created_at":"2026-05-18T00:47:50Z"},{"alias_kind":"pith_short_12","alias_value":"5DXJZ4SVHNDV","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5DXJZ4SVHNDV6MQB","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5DXJZ4SV","created_at":"2026-05-18T12:30:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:5DXJZ4SVHNDV6MQBC3JLJVCYHP","target":"record","payload":{"canonical_record":{"source":{"id":"1609.03791","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-09-13T12:21:52Z","cross_cats_sorted":[],"title_canon_sha256":"9d25d6d8d0118c32511bb987d58d363b57b1bbfbf79fb73809a8fea31458ac0d","abstract_canon_sha256":"49630296449e1607371e73a47ff26ba1435419b6337fd2db543d0df3b5acdde8"},"schema_version":"1.0"},"canonical_sha256":"e8ee9cf2553b475f320116d2b4d4583bcdc99b568becb03ee6e92aaa61eeb5d4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:47:50.054977Z","signature_b64":"lznF7TyyQ2D+D86TrOzeazqs4lynOYPT7NsOQjdRtoF+F1lA9j7P8odA9jvHKqBbw2rwVVV4rlar1v35VURABA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e8ee9cf2553b475f320116d2b4d4583bcdc99b568becb03ee6e92aaa61eeb5d4","last_reissued_at":"2026-05-18T00:47:50.054449Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:47:50.054449Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1609.03791","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":"2026-05-18T00:47:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FjD76kHIeMkSXDqhBUWYamBihS7cVCP2igYsP7amvxqzwRyjXkqHPPXY5lgh+LFLFOOINKkvP3QY7K6mQQIgBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T17:01:52.452577Z"},"content_sha256":"6a8fa67aafcc9310dc3b0ed0987b57cc8fda0d895beae54054a5f88c4758b974","schema_version":"1.0","event_id":"sha256:6a8fa67aafcc9310dc3b0ed0987b57cc8fda0d895beae54054a5f88c4758b974"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:5DXJZ4SVHNDV6MQBC3JLJVCYHP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The molecular gas mass of M33","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"B. Mookerjea, B.S. Koribalski, C. Henkel, C. Kramer, D. Calzetti, E. Rosolowsky, F. Combes, F.F.S. van der Tak, F. Herpin, F. Israel., F.S. Tabatabaei, J. Braine, K. Schuster, M. Boquien, M. R\\\"ollig, M. Wiedner, P. Gratier, P. van der Werf","submitted_at":"2016-09-13T12:21:52Z","abstract_excerpt":"[Abridged] Do some environments favor efficient conversion of molecular gas into stars? To answer this, we need to be able to estimate the H2 mass. Traditionally, this is done using CO and a few assumptions but the Herschel observations in the FIR make it possible to estimate the molecular gas mass independently of CO. Previous attempts to derive gas masses from dust emission suffered from biases. Generally, dust surface densities, HI column densities, and CO intensities are used to derive a gas-to-dust ratio (GDR) and the local CO intensity to H2 column density ratio (XCO), sometimes allowing"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.03791","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":"2026-05-18T00:47:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Lm1XI6r1BgIyquflCkUNF+v41q1J+0ba1a0vbZEyX+x4uxclQ44SVEva8JWgA3jlzZqHsVJiIoPZibuCcEa8AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T17:01:52.453294Z"},"content_sha256":"6c461f3781248206bcb02481f63a863e42446fb903af27de1554768b609d4281","schema_version":"1.0","event_id":"sha256:6c461f3781248206bcb02481f63a863e42446fb903af27de1554768b609d4281"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5DXJZ4SVHNDV6MQBC3JLJVCYHP/bundle.json","state_url":"https://pith.science/pith/5DXJZ4SVHNDV6MQBC3JLJVCYHP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5DXJZ4SVHNDV6MQBC3JLJVCYHP/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":"2026-05-25T17:01:52Z","links":{"resolver":"https://pith.science/pith/5DXJZ4SVHNDV6MQBC3JLJVCYHP","bundle":"https://pith.science/pith/5DXJZ4SVHNDV6MQBC3JLJVCYHP/bundle.json","state":"https://pith.science/pith/5DXJZ4SVHNDV6MQBC3JLJVCYHP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5DXJZ4SVHNDV6MQBC3JLJVCYHP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:5DXJZ4SVHNDV6MQBC3JLJVCYHP","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":"49630296449e1607371e73a47ff26ba1435419b6337fd2db543d0df3b5acdde8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-09-13T12:21:52Z","title_canon_sha256":"9d25d6d8d0118c32511bb987d58d363b57b1bbfbf79fb73809a8fea31458ac0d"},"schema_version":"1.0","source":{"id":"1609.03791","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.03791","created_at":"2026-05-18T00:47:50Z"},{"alias_kind":"arxiv_version","alias_value":"1609.03791v1","created_at":"2026-05-18T00:47:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.03791","created_at":"2026-05-18T00:47:50Z"},{"alias_kind":"pith_short_12","alias_value":"5DXJZ4SVHNDV","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5DXJZ4SVHNDV6MQB","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5DXJZ4SV","created_at":"2026-05-18T12:30:01Z"}],"graph_snapshots":[{"event_id":"sha256:6c461f3781248206bcb02481f63a863e42446fb903af27de1554768b609d4281","target":"graph","created_at":"2026-05-18T00:47:50Z","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":"[Abridged] Do some environments favor efficient conversion of molecular gas into stars? To answer this, we need to be able to estimate the H2 mass. Traditionally, this is done using CO and a few assumptions but the Herschel observations in the FIR make it possible to estimate the molecular gas mass independently of CO. Previous attempts to derive gas masses from dust emission suffered from biases. Generally, dust surface densities, HI column densities, and CO intensities are used to derive a gas-to-dust ratio (GDR) and the local CO intensity to H2 column density ratio (XCO), sometimes allowing","authors_text":"B. Mookerjea, B.S. Koribalski, C. Henkel, C. Kramer, D. Calzetti, E. Rosolowsky, F. Combes, F.F.S. van der Tak, F. Herpin, F. Israel., F.S. Tabatabaei, J. Braine, K. Schuster, M. Boquien, M. R\\\"ollig, M. Wiedner, P. Gratier, P. van der Werf","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-09-13T12:21:52Z","title":"The molecular gas mass of M33"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.03791","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":"sha256:6a8fa67aafcc9310dc3b0ed0987b57cc8fda0d895beae54054a5f88c4758b974","target":"record","created_at":"2026-05-18T00:47:50Z","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":"49630296449e1607371e73a47ff26ba1435419b6337fd2db543d0df3b5acdde8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-09-13T12:21:52Z","title_canon_sha256":"9d25d6d8d0118c32511bb987d58d363b57b1bbfbf79fb73809a8fea31458ac0d"},"schema_version":"1.0","source":{"id":"1609.03791","kind":"arxiv","version":1}},"canonical_sha256":"e8ee9cf2553b475f320116d2b4d4583bcdc99b568becb03ee6e92aaa61eeb5d4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e8ee9cf2553b475f320116d2b4d4583bcdc99b568becb03ee6e92aaa61eeb5d4","first_computed_at":"2026-05-18T00:47:50.054449Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:47:50.054449Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lznF7TyyQ2D+D86TrOzeazqs4lynOYPT7NsOQjdRtoF+F1lA9j7P8odA9jvHKqBbw2rwVVV4rlar1v35VURABA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:47:50.054977Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.03791","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6a8fa67aafcc9310dc3b0ed0987b57cc8fda0d895beae54054a5f88c4758b974","sha256:6c461f3781248206bcb02481f63a863e42446fb903af27de1554768b609d4281"],"state_sha256":"9c6ab9e60201d0833a6bcc8be6b1aa38efb65b3405f76b0ed21c45119cf72e4c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rwgQtGwH0hg1WSBdTINckiN19mjC0b1byE/es0M+TFfc+oWHGtE4vE2/VVtALDl9PUaT2trEdCCKTrvIZcAzCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T17:01:52.457280Z","bundle_sha256":"361d1d3ebec898c4d04ef95d20e2f63e66f59f04528fa6437a4b00dbcb2fbaf4"}}