{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:HDBJKEAMT56PNQL2675U4GSR7M","short_pith_number":"pith:HDBJKEAM","canonical_record":{"source":{"id":"1907.02934","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-05T17:02:08Z","cross_cats_sorted":[],"title_canon_sha256":"c5600698c18a08be6bc3141bc35e9628cd1e23fac3f269fc5c35b50a8268d0b2","abstract_canon_sha256":"02f72be528c7683b1b13246f6e03de07556e57a4d46b0011a180df72ac5978b5"},"schema_version":"1.0"},"canonical_sha256":"38c295100c9f7cf6c17af7fb4e1a51fb2080010fa7137aad4807a5ca27028f16","source":{"kind":"arxiv","id":"1907.02934","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.02934","created_at":"2026-05-17T23:41:16Z"},{"alias_kind":"arxiv_version","alias_value":"1907.02934v1","created_at":"2026-05-17T23:41:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.02934","created_at":"2026-05-17T23:41:16Z"},{"alias_kind":"pith_short_12","alias_value":"HDBJKEAMT56P","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"HDBJKEAMT56PNQL2","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"HDBJKEAM","created_at":"2026-05-18T12:33:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:HDBJKEAMT56PNQL2675U4GSR7M","target":"record","payload":{"canonical_record":{"source":{"id":"1907.02934","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-05T17:02:08Z","cross_cats_sorted":[],"title_canon_sha256":"c5600698c18a08be6bc3141bc35e9628cd1e23fac3f269fc5c35b50a8268d0b2","abstract_canon_sha256":"02f72be528c7683b1b13246f6e03de07556e57a4d46b0011a180df72ac5978b5"},"schema_version":"1.0"},"canonical_sha256":"38c295100c9f7cf6c17af7fb4e1a51fb2080010fa7137aad4807a5ca27028f16","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:41:16.908400Z","signature_b64":"VQnvwzfQGRlZuJssVfmIFy2DBgkKzbb2WH1YwTxoad/cFnjYnfk7yOLnkSjMB6sB6q03latultMBErG2vfGtAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"38c295100c9f7cf6c17af7fb4e1a51fb2080010fa7137aad4807a5ca27028f16","last_reissued_at":"2026-05-17T23:41:16.907959Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:41:16.907959Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.02934","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":"2026-05-17T23:41:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ID9zxRAs2nxpwgVW0Eb67CUM4CRGwU2zt6r7jEyHifOUXpXBR+Jr6ExMk0tInP3cLsPao4NVmcfRYHSa2lawBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T15:00:53.914789Z"},"content_sha256":"be7ff58095d94ce68d3eb11faa1bdccbe2fd8373b4d3da5c4d3baac0839e3060","schema_version":"1.0","event_id":"sha256:be7ff58095d94ce68d3eb11faa1bdccbe2fd8373b4d3da5c4d3baac0839e3060"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:HDBJKEAMT56PNQL2675U4GSR7M","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Propagation of star formation at sub-kiloparsec scales","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alexander S. Gusev, Elena V. Shimanovskaya","submitted_at":"2019-07-05T17:02:08Z","abstract_excerpt":"We study the propagation of star formation based on the investigation of the separation of young star clusters from HII regions nearest to them. The relation between the separation and U-B colour index (or age) of a star cluster was found. The average age of star clusters increases with the separation as the 1.0-1.2 power in the separation range from 40 to 200 pc and as the 0.4-0.9 power in the range of 100-500 pc in the galaxies with symmetric morphology. The galaxies with distorted asymmetric disc structure show more complex and steeper (power >1.2 at separations from 40 to 500 pc) dependenc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.02934","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":"2026-05-17T23:41:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ki8DDYNA9QqjNGi7bAA8TkAq/EvKciXIcHq9pgxb25Zec5vtVsPYX+LCZsDKJ17GLcEwPC2BinDjLpwe0MTWDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T15:00:53.915452Z"},"content_sha256":"9d920fa3fdf515b9f6672ce5b77b8ff9ca38609d06207f398333911a286fd617","schema_version":"1.0","event_id":"sha256:9d920fa3fdf515b9f6672ce5b77b8ff9ca38609d06207f398333911a286fd617"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HDBJKEAMT56PNQL2675U4GSR7M/bundle.json","state_url":"https://pith.science/pith/HDBJKEAMT56PNQL2675U4GSR7M/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HDBJKEAMT56PNQL2675U4GSR7M/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":"2026-05-25T15:00:53Z","links":{"resolver":"https://pith.science/pith/HDBJKEAMT56PNQL2675U4GSR7M","bundle":"https://pith.science/pith/HDBJKEAMT56PNQL2675U4GSR7M/bundle.json","state":"https://pith.science/pith/HDBJKEAMT56PNQL2675U4GSR7M/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HDBJKEAMT56PNQL2675U4GSR7M/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:HDBJKEAMT56PNQL2675U4GSR7M","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":"02f72be528c7683b1b13246f6e03de07556e57a4d46b0011a180df72ac5978b5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-05T17:02:08Z","title_canon_sha256":"c5600698c18a08be6bc3141bc35e9628cd1e23fac3f269fc5c35b50a8268d0b2"},"schema_version":"1.0","source":{"id":"1907.02934","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.02934","created_at":"2026-05-17T23:41:16Z"},{"alias_kind":"arxiv_version","alias_value":"1907.02934v1","created_at":"2026-05-17T23:41:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.02934","created_at":"2026-05-17T23:41:16Z"},{"alias_kind":"pith_short_12","alias_value":"HDBJKEAMT56P","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"HDBJKEAMT56PNQL2","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"HDBJKEAM","created_at":"2026-05-18T12:33:18Z"}],"graph_snapshots":[{"event_id":"sha256:9d920fa3fdf515b9f6672ce5b77b8ff9ca38609d06207f398333911a286fd617","target":"graph","created_at":"2026-05-17T23:41:16Z","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 study the propagation of star formation based on the investigation of the separation of young star clusters from HII regions nearest to them. The relation between the separation and U-B colour index (or age) of a star cluster was found. The average age of star clusters increases with the separation as the 1.0-1.2 power in the separation range from 40 to 200 pc and as the 0.4-0.9 power in the range of 100-500 pc in the galaxies with symmetric morphology. The galaxies with distorted asymmetric disc structure show more complex and steeper (power >1.2 at separations from 40 to 500 pc) dependenc","authors_text":"Alexander S. Gusev, Elena V. Shimanovskaya","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-05T17:02:08Z","title":"Propagation of star formation at sub-kiloparsec scales"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.02934","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:be7ff58095d94ce68d3eb11faa1bdccbe2fd8373b4d3da5c4d3baac0839e3060","target":"record","created_at":"2026-05-17T23:41:16Z","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":"02f72be528c7683b1b13246f6e03de07556e57a4d46b0011a180df72ac5978b5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-05T17:02:08Z","title_canon_sha256":"c5600698c18a08be6bc3141bc35e9628cd1e23fac3f269fc5c35b50a8268d0b2"},"schema_version":"1.0","source":{"id":"1907.02934","kind":"arxiv","version":1}},"canonical_sha256":"38c295100c9f7cf6c17af7fb4e1a51fb2080010fa7137aad4807a5ca27028f16","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"38c295100c9f7cf6c17af7fb4e1a51fb2080010fa7137aad4807a5ca27028f16","first_computed_at":"2026-05-17T23:41:16.907959Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:41:16.907959Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VQnvwzfQGRlZuJssVfmIFy2DBgkKzbb2WH1YwTxoad/cFnjYnfk7yOLnkSjMB6sB6q03latultMBErG2vfGtAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:41:16.908400Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.02934","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:be7ff58095d94ce68d3eb11faa1bdccbe2fd8373b4d3da5c4d3baac0839e3060","sha256:9d920fa3fdf515b9f6672ce5b77b8ff9ca38609d06207f398333911a286fd617"],"state_sha256":"6de4c026389764977006788015f54975bc9117ed827cb00d7f80dfb506730d2f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"G93BRDBVD4DVO3s3wHrPSHH7eg66p0VqJyM7WXX8Z5B7UE7IB6fkrxKIfrXloAcjK5mvvd9+V3OwXAzNHJXRAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T15:00:53.917916Z","bundle_sha256":"4cba458e9436a1ec0f1f7e9ba0964023794c89b5b39473c1540c268d8e458fbc"}}