{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:EOB42P5QPIW4AOOCCKEP5MNAMP","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":"8eb19e760427149006b8aba50e7de4e3154cdbe3847887dc6b95aabf6d91f2e7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-08-22T14:25:50Z","title_canon_sha256":"9b501e4381fa1cf2780e191a194d2c6d0663c7e19c403a181dc9f26c89d2bc43"},"schema_version":"1.0","source":{"id":"1908.08404","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.08404","created_at":"2026-07-05T01:14:27Z"},{"alias_kind":"arxiv_version","alias_value":"1908.08404v4","created_at":"2026-07-05T01:14:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.08404","created_at":"2026-07-05T01:14:27Z"},{"alias_kind":"pith_short_12","alias_value":"EOB42P5QPIW4","created_at":"2026-07-05T01:14:27Z"},{"alias_kind":"pith_short_16","alias_value":"EOB42P5QPIW4AOOC","created_at":"2026-07-05T01:14:27Z"},{"alias_kind":"pith_short_8","alias_value":"EOB42P5Q","created_at":"2026-07-05T01:14:27Z"}],"graph_snapshots":[{"event_id":"sha256:7dc7bcb9905740c18247ecc494dc060259cc613cab32420aab10427d9145b7b4","target":"graph","created_at":"2026-07-05T01:14:27Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1908.08404/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report the first evidence for high-mass star formation triggered by collisions of molecular clouds in M33. Using the Atacama Large Millimeter/submillimeter Array, we spatially resolved filamentary structures of giant molecular cloud 37 in M33 using $^{12}$CO($J$ = 2-1), $^{13}$CO($J$ = 2-1), and C$^{18}$O($J$ = 2-1) line emission at a spatial resolution of $\\sim$2 pc. There are two individual molecular clouds with a systematic velocity difference of $\\sim$6 km s$^{-1}$. Three continuum sources representing up to $\\sim$10 high-mass stars with the spectral types of B0V-O7.5V are embedded with","authors_text":"Gavin Rowell, Hidetoshi Sano, Jonathan Knies, Kazuki Tokuda, Kazuyuki Muraoka, Kengo Tachihara, Kisetsu Tsuge, Manami Sasaki, Mikito Kohno, Miroslav D. Filipovic, Nigel Maxted, Paul P. Plucinsky, Rei Enokiya, Shinji Fujita, Toshikazu Onishi, Yasuo Fukui, Yumiko Yamane","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-08-22T14:25:50Z","title":"ALMA CO Observations of a Giant Molecular Cloud in M33: Evidence for High-Mass Star Formation Triggered by Cloud-Cloud Collisions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.08404","kind":"arxiv","version":4},"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":"sha256:9c7ce5644e4ca422effc5a65d2316ae4ae6f2aee13cd436040958f3e1830e643","target":"record","created_at":"2026-07-05T01:14:27Z","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":"8eb19e760427149006b8aba50e7de4e3154cdbe3847887dc6b95aabf6d91f2e7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-08-22T14:25:50Z","title_canon_sha256":"9b501e4381fa1cf2780e191a194d2c6d0663c7e19c403a181dc9f26c89d2bc43"},"schema_version":"1.0","source":{"id":"1908.08404","kind":"arxiv","version":4}},"canonical_sha256":"2383cd3fb07a2dc039c21288feb1a063d2e3f274af65269f6ddc9e537e16786e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2383cd3fb07a2dc039c21288feb1a063d2e3f274af65269f6ddc9e537e16786e","first_computed_at":"2026-07-05T01:14:27.721982Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:14:27.721982Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gsDOijsn1ZnVPHGCmhsUIjjNkBxQtInsaGij+YHONbyJTz93coD4HQq6QgzLsZeUP1dwyhEAnbK/Wo2QSuX0AA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:14:27.722394Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.08404","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9c7ce5644e4ca422effc5a65d2316ae4ae6f2aee13cd436040958f3e1830e643","sha256:7dc7bcb9905740c18247ecc494dc060259cc613cab32420aab10427d9145b7b4"],"state_sha256":"c25275d2ed14bc90a3948d9c81ea8bc8c073e70430ba03dec6c529bcd92d319f"}