{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:VDTXF3DFFPAY6LF6UNKT47KQCC","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":"f229e72c6eeff9148e577989ba992fa9fd3d955a20697517bba738ff4d7f5947","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-05-01T09:48:35Z","title_canon_sha256":"4e3ca41a4c27dff40676810adea4811cd3431495efdb88e5bed3340764110ee7"},"schema_version":"1.0","source":{"id":"astro-ph/0605022","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0605022","created_at":"2026-05-18T01:40:32Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0605022v1","created_at":"2026-05-18T01:40:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0605022","created_at":"2026-05-18T01:40:32Z"},{"alias_kind":"pith_short_12","alias_value":"VDTXF3DFFPAY","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_16","alias_value":"VDTXF3DFFPAY6LF6","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_8","alias_value":"VDTXF3DF","created_at":"2026-05-18T12:25:54Z"}],"graph_snapshots":[{"event_id":"sha256:bfc1f2904598aeaddbeb260d3685c49af13047db61fed364b55e88e790e3e9ce","target":"graph","created_at":"2026-05-18T01:40:32Z","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 exploit the superb resolution of the new HST/ACS mosaic image of M51 to select a large sample of young (< 1 Gyr) star clusters in the spiral disk, based on their sizes. The image covers the entire spiral disk in B, V, I and H_alpha, at a resolution of 2 pc per pixel. The surface density distribution of 4357 resolved clusters shows that the clusters are more correlated with clouds than with stars, and we find a hint of enhanced cluster formation at the corotation radius. The radius distribution of a sample of 769 clusters with more accurate radii suggests that young star clusters have a pref","authors_text":"H. J. G. L. M. Lamers, M. Gieles, M. R. Haas, N. Bastian, R. A. Scheepmaker, S. S. Larsen","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2006-05-01T09:48:35Z","title":"The radii of thousands of star clusters in M51 with HST/ACS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0605022","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":"sha256:47362773388a70ece245342f49743f5f239c220f2e265a8f89aa9596702df869","target":"record","created_at":"2026-05-18T01:40:32Z","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":"f229e72c6eeff9148e577989ba992fa9fd3d955a20697517bba738ff4d7f5947","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-05-01T09:48:35Z","title_canon_sha256":"4e3ca41a4c27dff40676810adea4811cd3431495efdb88e5bed3340764110ee7"},"schema_version":"1.0","source":{"id":"astro-ph/0605022","kind":"arxiv","version":1}},"canonical_sha256":"a8e772ec652bc18f2cbea3553e7d5010b247977eca431511a45c9f3bf825a2c3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a8e772ec652bc18f2cbea3553e7d5010b247977eca431511a45c9f3bf825a2c3","first_computed_at":"2026-05-18T01:40:32.015214Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:40:32.015214Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Zihtyedj6gUdLx25xnWG5/WZcgUKy9lsjjf1DgQ78MhzOC3Np+3GNoA/mYs3IMWRyjmLqy1sToRCgJErNgN4DA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:40:32.015807Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0605022","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:47362773388a70ece245342f49743f5f239c220f2e265a8f89aa9596702df869","sha256:bfc1f2904598aeaddbeb260d3685c49af13047db61fed364b55e88e790e3e9ce"],"state_sha256":"7cb91fd81f2f14a8cde223f0889c3ddb513d8313ca26e589e01fcb5709fc83d4"}