{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2001:EFYCA3SSZTCUZYI62XCEGKMA54","short_pith_number":"pith:EFYCA3SS","schema_version":"1.0","canonical_sha256":"2170206e52ccc54ce11ed5c4432980ef12aeb0c7af7355b15b276feb8be14372","source":{"kind":"arxiv","id":"astro-ph/0108298","version":1},"attestation_state":"computed","paper":{"title":"How Did Globular Clusters Form?","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Sidney van den Bergh","submitted_at":"2001-08-17T19:09:53Z","abstract_excerpt":"It is suggested that there have been at least two physically distinct epochs of massive cluster formation. The first generation of globular clusters may have formed as halo gas was compressed by shocks driven inward by ionization fronts generated during cosmic reionization at z ~ 6. On the other hand a second generation of massive clusters might have been formed at later times by compression, and subsequent collapse, of giant molecular clouds. In some cases this compression may have been triggered by heating of the interstellar medium via collisions between gas-rich disk galaxies. It is also s"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"astro-ph/0108298","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2001-08-17T19:09:53Z","cross_cats_sorted":[],"title_canon_sha256":"228b53e7a4fb6aae5ddd9baf165ec57668e61a77ec0d07475ab29c136214d542","abstract_canon_sha256":"b616ff348a54c65ee87358a5c01ad08ed08baae307d5b299c4f6d91ff8b709db"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:05.226811Z","signature_b64":"TR5t16Be64GFDzWD7yiyjPLbaaq/5wXIuYavRZwxwWprBFQw9rPQneBPXNonxZyC0wPx4UGw5s/G6jBvpFXwDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2170206e52ccc54ce11ed5c4432980ef12aeb0c7af7355b15b276feb8be14372","last_reissued_at":"2026-05-18T04:29:05.226118Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:05.226118Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"How Did Globular Clusters Form?","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Sidney van den Bergh","submitted_at":"2001-08-17T19:09:53Z","abstract_excerpt":"It is suggested that there have been at least two physically distinct epochs of massive cluster formation. The first generation of globular clusters may have formed as halo gas was compressed by shocks driven inward by ionization fronts generated during cosmic reionization at z ~ 6. On the other hand a second generation of massive clusters might have been formed at later times by compression, and subsequent collapse, of giant molecular clouds. In some cases this compression may have been triggered by heating of the interstellar medium via collisions between gas-rich disk galaxies. It is also s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0108298","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0108298","created_at":"2026-05-18T04:29:05.226218+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0108298v1","created_at":"2026-05-18T04:29:05.226218+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0108298","created_at":"2026-05-18T04:29:05.226218+00:00"},{"alias_kind":"pith_short_12","alias_value":"EFYCA3SSZTCU","created_at":"2026-05-18T12:25:50.254431+00:00"},{"alias_kind":"pith_short_16","alias_value":"EFYCA3SSZTCUZYI6","created_at":"2026-05-18T12:25:50.254431+00:00"},{"alias_kind":"pith_short_8","alias_value":"EFYCA3SS","created_at":"2026-05-18T12:25:50.254431+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/EFYCA3SSZTCUZYI62XCEGKMA54","json":"https://pith.science/pith/EFYCA3SSZTCUZYI62XCEGKMA54.json","graph_json":"https://pith.science/api/pith-number/EFYCA3SSZTCUZYI62XCEGKMA54/graph.json","events_json":"https://pith.science/api/pith-number/EFYCA3SSZTCUZYI62XCEGKMA54/events.json","paper":"https://pith.science/paper/EFYCA3SS"},"agent_actions":{"view_html":"https://pith.science/pith/EFYCA3SSZTCUZYI62XCEGKMA54","download_json":"https://pith.science/pith/EFYCA3SSZTCUZYI62XCEGKMA54.json","view_paper":"https://pith.science/paper/EFYCA3SS","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0108298&json=true","fetch_graph":"https://pith.science/api/pith-number/EFYCA3SSZTCUZYI62XCEGKMA54/graph.json","fetch_events":"https://pith.science/api/pith-number/EFYCA3SSZTCUZYI62XCEGKMA54/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/EFYCA3SSZTCUZYI62XCEGKMA54/action/timestamp_anchor","attest_storage":"https://pith.science/pith/EFYCA3SSZTCUZYI62XCEGKMA54/action/storage_attestation","attest_author":"https://pith.science/pith/EFYCA3SSZTCUZYI62XCEGKMA54/action/author_attestation","sign_citation":"https://pith.science/pith/EFYCA3SSZTCUZYI62XCEGKMA54/action/citation_signature","submit_replication":"https://pith.science/pith/EFYCA3SSZTCUZYI62XCEGKMA54/action/replication_record"}},"created_at":"2026-05-18T04:29:05.226218+00:00","updated_at":"2026-05-18T04:29:05.226218+00:00"}