{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2004:IM7KSVOOJ66ZQYAOKRUN2NW3QB","short_pith_number":"pith:IM7KSVOO","canonical_record":{"source":{"id":"astro-ph/0402148","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-02-06T14:48:54Z","cross_cats_sorted":[],"title_canon_sha256":"021bac50e45f1e38de51df9ef9017480f1229e1501cf6928fdd6cb8de443dca6","abstract_canon_sha256":"62df240e47368a77893a8cfd29ac9e41372386bd55eeeb5a6a2d74a72399ffeb"},"schema_version":"1.0"},"canonical_sha256":"433ea955ce4fbd98600e5468dd36db804a70d8ad854049503a01b1e08ac0be85","source":{"kind":"arxiv","id":"astro-ph/0402148","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0402148","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0402148v1","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0402148","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"pith_short_12","alias_value":"IM7KSVOOJ66Z","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"IM7KSVOOJ66ZQYAO","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"IM7KSVOO","created_at":"2026-05-18T12:25:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2004:IM7KSVOOJ66ZQYAOKRUN2NW3QB","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0402148","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-02-06T14:48:54Z","cross_cats_sorted":[],"title_canon_sha256":"021bac50e45f1e38de51df9ef9017480f1229e1501cf6928fdd6cb8de443dca6","abstract_canon_sha256":"62df240e47368a77893a8cfd29ac9e41372386bd55eeeb5a6a2d74a72399ffeb"},"schema_version":"1.0"},"canonical_sha256":"433ea955ce4fbd98600e5468dd36db804a70d8ad854049503a01b1e08ac0be85","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:32.825809Z","signature_b64":"AkGXmfF3ugoI3QG4JU6fv88PpW5173hZSrQkzcF+OgfkY9lizQvt8c+gAgv6CrL+A0qoJNLF5COaYI+RwUVoCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"433ea955ce4fbd98600e5468dd36db804a70d8ad854049503a01b1e08ac0be85","last_reissued_at":"2026-05-18T01:07:32.825040Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:32.825040Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0402148","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":"2026-05-18T01:07:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"J7M2Vjrx6Dow1o/IAiqNFeOzFtEpd7QBb82x4G7Q64mp3QZx0as6pP3rQpd5DAmOf9jAxzQYaujuoMEQMqWnAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T22:20:00.587530Z"},"content_sha256":"cef95b72b413daefdff751b3bf1eafd8ecb50ed57d2bdc8a06139a429b46d98c","schema_version":"1.0","event_id":"sha256:cef95b72b413daefdff751b3bf1eafd8ecb50ed57d2bdc8a06139a429b46d98c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2004:IM7KSVOOJ66ZQYAOKRUN2NW3QB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Colliding molecular clouds in head-on galaxy collisions","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"E. Brinks, J. Braine, P.-A. Duc, S. Leon, U. Lisenfeld, V. Charmandaris","submitted_at":"2004-02-06T14:48:54Z","abstract_excerpt":"We present further observations of molecular gas in head-on collisions of spiral galaxies, this time of the CO(J=1-0) and CO(J=2-1) lines in the UGC 813 -- UGC 816 system. UGC 813/6 are only the second known example of head-on spiral-spiral collisions, the first example being the UGC 12914/5 pair. Strong CO emission is present in the bridge between UGC 813 and 816, unassociated with stellar emission, just as in UGC 12914/5. The CO emission from the UGC 813/6 bridge, not counting the emission from the galaxies themselves, is at least that of the entire Milky Way. Collisions of gas-rich spirals "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0402148","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":"2026-05-18T01:07:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4/EsvD8UEv/HirTvyH5x2xvpzBynjTYnrs7+OR1HTCMK5ltQHAJxueOWKNTsP2E8EtpZ81XUHAFiBLI/SorgAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T22:20:00.587959Z"},"content_sha256":"f41f525cb1df4a7b32a0ed75722ab180d1ed112357f1aa423d4f0255879ebb87","schema_version":"1.0","event_id":"sha256:f41f525cb1df4a7b32a0ed75722ab180d1ed112357f1aa423d4f0255879ebb87"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IM7KSVOOJ66ZQYAOKRUN2NW3QB/bundle.json","state_url":"https://pith.science/pith/IM7KSVOOJ66ZQYAOKRUN2NW3QB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IM7KSVOOJ66ZQYAOKRUN2NW3QB/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":"2026-05-25T22:20:00Z","links":{"resolver":"https://pith.science/pith/IM7KSVOOJ66ZQYAOKRUN2NW3QB","bundle":"https://pith.science/pith/IM7KSVOOJ66ZQYAOKRUN2NW3QB/bundle.json","state":"https://pith.science/pith/IM7KSVOOJ66ZQYAOKRUN2NW3QB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IM7KSVOOJ66ZQYAOKRUN2NW3QB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:IM7KSVOOJ66ZQYAOKRUN2NW3QB","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":"62df240e47368a77893a8cfd29ac9e41372386bd55eeeb5a6a2d74a72399ffeb","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2004-02-06T14:48:54Z","title_canon_sha256":"021bac50e45f1e38de51df9ef9017480f1229e1501cf6928fdd6cb8de443dca6"},"schema_version":"1.0","source":{"id":"astro-ph/0402148","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0402148","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0402148v1","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0402148","created_at":"2026-05-18T01:07:32Z"},{"alias_kind":"pith_short_12","alias_value":"IM7KSVOOJ66Z","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"IM7KSVOOJ66ZQYAO","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"IM7KSVOO","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:f41f525cb1df4a7b32a0ed75722ab180d1ed112357f1aa423d4f0255879ebb87","target":"graph","created_at":"2026-05-18T01:07:32Z","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":"We present further observations of molecular gas in head-on collisions of spiral galaxies, this time of the CO(J=1-0) and CO(J=2-1) lines in the UGC 813 -- UGC 816 system. UGC 813/6 are only the second known example of head-on spiral-spiral collisions, the first example being the UGC 12914/5 pair. Strong CO emission is present in the bridge between UGC 813 and 816, unassociated with stellar emission, just as in UGC 12914/5. The CO emission from the UGC 813/6 bridge, not counting the emission from the galaxies themselves, is at least that of the entire Milky Way. Collisions of gas-rich spirals ","authors_text":"E. Brinks, J. Braine, P.-A. Duc, S. Leon, U. Lisenfeld, V. Charmandaris","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2004-02-06T14:48:54Z","title":"Colliding molecular clouds in head-on galaxy collisions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0402148","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:cef95b72b413daefdff751b3bf1eafd8ecb50ed57d2bdc8a06139a429b46d98c","target":"record","created_at":"2026-05-18T01:07:32Z","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":"62df240e47368a77893a8cfd29ac9e41372386bd55eeeb5a6a2d74a72399ffeb","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2004-02-06T14:48:54Z","title_canon_sha256":"021bac50e45f1e38de51df9ef9017480f1229e1501cf6928fdd6cb8de443dca6"},"schema_version":"1.0","source":{"id":"astro-ph/0402148","kind":"arxiv","version":1}},"canonical_sha256":"433ea955ce4fbd98600e5468dd36db804a70d8ad854049503a01b1e08ac0be85","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"433ea955ce4fbd98600e5468dd36db804a70d8ad854049503a01b1e08ac0be85","first_computed_at":"2026-05-18T01:07:32.825040Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:07:32.825040Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AkGXmfF3ugoI3QG4JU6fv88PpW5173hZSrQkzcF+OgfkY9lizQvt8c+gAgv6CrL+A0qoJNLF5COaYI+RwUVoCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:07:32.825809Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0402148","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cef95b72b413daefdff751b3bf1eafd8ecb50ed57d2bdc8a06139a429b46d98c","sha256:f41f525cb1df4a7b32a0ed75722ab180d1ed112357f1aa423d4f0255879ebb87"],"state_sha256":"6ecd6224af88e1bc30821d8632dc0e1fbaec6712bd98f7617618688ad2a57653"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8ReZKIyXXSluPn4efDaV5Dk+5PYF+i2WEKwm9yd5Cti/OwD7KCnJIGtelYvkPQ3qu7Mjo9Yi8Vi+VXwxUhmTCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T22:20:00.590549Z","bundle_sha256":"ed2d7bc2126d230b7eaca6d511f92e003528bcc3cbd28888c8c48b0a381e152a"}}