{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:JL62BHENR2UOORSNB5EXG3LKTA","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":"cc2149d0772fa84849b9597773c65b2ed414dfeeb4b01a6279d098cb88091b15","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-07T20:12:04Z","title_canon_sha256":"9ea335b752a85a0b275fc8fbd35aebc8a027f3caea8753c3f98a92ddd7e1e970"},"schema_version":"1.0","source":{"id":"1705.02692","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.02692","created_at":"2026-05-18T00:42:28Z"},{"alias_kind":"arxiv_version","alias_value":"1705.02692v1","created_at":"2026-05-18T00:42:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.02692","created_at":"2026-05-18T00:42:28Z"},{"alias_kind":"pith_short_12","alias_value":"JL62BHENR2UO","created_at":"2026-05-18T12:31:24Z"},{"alias_kind":"pith_short_16","alias_value":"JL62BHENR2UOORSN","created_at":"2026-05-18T12:31:24Z"},{"alias_kind":"pith_short_8","alias_value":"JL62BHEN","created_at":"2026-05-18T12:31:24Z"}],"graph_snapshots":[{"event_id":"sha256:236c3d5f292664a25c4db2ccb061caf9c9ed056819f5df7b8648c3c2e09a5d98","target":"graph","created_at":"2026-05-18T00:42:28Z","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 a study of the effective (half-light) radii and other structural properties of a systematically selected sample of young, massive star clusters (YMCs, $\\geq$$5\\times10^3$ M$_{\\odot}$ and $\\leq$200 Myr) in two nearby spiral galaxies, NGC 628 and NGC 1313. We use Hubble Space Telescope WFC3/UVIS and archival ACS/WFC data obtained by the Legacy Extragalactic UV Survey (LEGUS), an HST Treasury Program. We measure effective radii with GALFIT, a two-dimensional image-fitting package, and with a new technique to estimate effective radii from the concentration index (CI) of observed cluster","authors_text":"A. Adamo, B. E. Elmegreen, D. A. Dale, D. A. Gouliermis, D. Calzetti, D. O. Cook, D. Thilker, E. K. Grebel, H. Kim, J. E. Ryon, J. S. Gallagher, K. Grasha, L. J. Smith, L. Ubeda, M. Cignoni, M. Fumagalli, M. Messa, S. N. Bright","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-07T20:12:04Z","title":"Effective Radii of Young, Massive Star Clusters in Two LEGUS Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.02692","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":"sha256:1909a162d27bcd43ba41bbf5e059b89b2a07dda6ecbbc65f54274f7d4599ae7f","target":"record","created_at":"2026-05-18T00:42:28Z","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":"cc2149d0772fa84849b9597773c65b2ed414dfeeb4b01a6279d098cb88091b15","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-05-07T20:12:04Z","title_canon_sha256":"9ea335b752a85a0b275fc8fbd35aebc8a027f3caea8753c3f98a92ddd7e1e970"},"schema_version":"1.0","source":{"id":"1705.02692","kind":"arxiv","version":1}},"canonical_sha256":"4afda09c8d8ea8e7464d0f49736d6a983f879b73f02b6abe3c7ae904f01253cf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4afda09c8d8ea8e7464d0f49736d6a983f879b73f02b6abe3c7ae904f01253cf","first_computed_at":"2026-05-18T00:42:28.666272Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:42:28.666272Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kqG+xHidAW/sF0MW/t4A6V45ozpLVeU2TywniJgbOFZZg/dnotbjnBr3ITrqAQLFFZSrNsQnMEe/ovclGWfNCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:42:28.666913Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.02692","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1909a162d27bcd43ba41bbf5e059b89b2a07dda6ecbbc65f54274f7d4599ae7f","sha256:236c3d5f292664a25c4db2ccb061caf9c9ed056819f5df7b8648c3c2e09a5d98"],"state_sha256":"d182de4300550af2e9b07a56c677dff7d9d3e029c80ad92b5cc58ae2e61fddf2"}