{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:G5AITWZ4TYHELKHPIB2R77OHXX","short_pith_number":"pith:G5AITWZ4","canonical_record":{"source":{"id":"1910.02983","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-10-07T18:07:44Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"01e36f54a1a2f23676b00524998d49aae1243c7c333ec823678b145f41482a24","abstract_canon_sha256":"b733771af0bd150c4ff8ce2cc45fd11c0c7a33b26f1debcde5461bb49a57ac17"},"schema_version":"1.0"},"canonical_sha256":"374089db3c9e0e45a8ef40751ffdc7bdd0e3487c8353de4182c9c3b25d24eeda","source":{"kind":"arxiv","id":"1910.02983","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1910.02983","created_at":"2026-07-05T00:13:58Z"},{"alias_kind":"arxiv_version","alias_value":"1910.02983v2","created_at":"2026-07-05T00:13:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1910.02983","created_at":"2026-07-05T00:13:58Z"},{"alias_kind":"pith_short_12","alias_value":"G5AITWZ4TYHE","created_at":"2026-07-05T00:13:58Z"},{"alias_kind":"pith_short_16","alias_value":"G5AITWZ4TYHELKHP","created_at":"2026-07-05T00:13:58Z"},{"alias_kind":"pith_short_8","alias_value":"G5AITWZ4","created_at":"2026-07-05T00:13:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:G5AITWZ4TYHELKHPIB2R77OHXX","target":"record","payload":{"canonical_record":{"source":{"id":"1910.02983","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-10-07T18:07:44Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"01e36f54a1a2f23676b00524998d49aae1243c7c333ec823678b145f41482a24","abstract_canon_sha256":"b733771af0bd150c4ff8ce2cc45fd11c0c7a33b26f1debcde5461bb49a57ac17"},"schema_version":"1.0"},"canonical_sha256":"374089db3c9e0e45a8ef40751ffdc7bdd0e3487c8353de4182c9c3b25d24eeda","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:13:58.750182Z","signature_b64":"qkKSxma8cRCsDLJrhKuW88bFpa5lxNRtm5xfu1oSsWeE/7zge96sfC0yXgzc/mKeP/9Aw/mFsMbMqIrL4/X9Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"374089db3c9e0e45a8ef40751ffdc7bdd0e3487c8353de4182c9c3b25d24eeda","last_reissued_at":"2026-07-05T00:13:58.749687Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:13:58.749687Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1910.02983","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:13:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0NYlfJo+0CsrsR2JzGE4BQ3f2AKpb52uP7x1GkL12wWH8dj2ZmFknluGOLs6g/xNEZHofnPHF7lkGTz6i/TfAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T17:45:24.318962Z"},"content_sha256":"03b06cfb408f1a7506c96f39253ca49d952236a2a828a44ded0b0775bd641326","schema_version":"1.0","event_id":"sha256:03b06cfb408f1a7506c96f39253ca49d952236a2a828a44ded0b0775bd641326"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:G5AITWZ4TYHELKHPIB2R77OHXX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"H$\\alpha$ Morphologies of Star Clusters: A LEGUS study of HII region evolution timescales and stochasticity in low mass clusters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"A. Adamo, A. Aloisi, A. Herrero, A. Wofford, B.C. Whitmore, B. Mobasher, D.A. Gouliermis, D.A. Hunter, D. Calzetti, D. Dale, D.M. Elmegreen, D.O. Cook, D. Thilker, E.K. Grebel, E. Sacchi, H. Kim, Janice C. Lee, J. Turner, K.E. Johnson, K. Grasha, L. Della Bruna, L. Smith, M. Cignoni, R.A.M. Walterbos, R. Chandar, R. Kennicutt, S. Deger, Stephen Hannon","submitted_at":"2019-10-07T18:07:44Z","abstract_excerpt":"The morphology of HII regions around young star clusters provides insight into the timescales and physical processes that clear a cluster's natal gas. We study ~700 young clusters (<10Myr) in three nearby spiral galaxies (NGC 7793, NGC 4395, and NGC 1313) using Hubble Space Telescope (HST) imaging from LEGUS (Legacy ExtraGalactic Ultraviolet Survey). Clusters are classified by their H$\\alpha$ morphology (concentrated, partially exposed, no-emission) and whether they have neighboring clusters (which could affect the clearing timescales). Through visual inspection of the HST images, and analysis"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1910.02983","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1910.02983/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:13:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dOVqARx972ET+g1UXpADEi/vZECgXF0eSFDq/dSy+UIuMJhHgDw+5a04wU8B+R0Ok6scwwpHX1mYhRFbsWpzCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T17:45:24.319916Z"},"content_sha256":"afe69db7bd944aa73cbff2bf38e06254c14244ff323a116631413c4f88c868a1","schema_version":"1.0","event_id":"sha256:afe69db7bd944aa73cbff2bf38e06254c14244ff323a116631413c4f88c868a1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G5AITWZ4TYHELKHPIB2R77OHXX/bundle.json","state_url":"https://pith.science/pith/G5AITWZ4TYHELKHPIB2R77OHXX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G5AITWZ4TYHELKHPIB2R77OHXX/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":"2026-08-06T17:45:24Z","links":{"resolver":"https://pith.science/pith/G5AITWZ4TYHELKHPIB2R77OHXX","bundle":"https://pith.science/pith/G5AITWZ4TYHELKHPIB2R77OHXX/bundle.json","state":"https://pith.science/pith/G5AITWZ4TYHELKHPIB2R77OHXX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G5AITWZ4TYHELKHPIB2R77OHXX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:G5AITWZ4TYHELKHPIB2R77OHXX","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":"b733771af0bd150c4ff8ce2cc45fd11c0c7a33b26f1debcde5461bb49a57ac17","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-10-07T18:07:44Z","title_canon_sha256":"01e36f54a1a2f23676b00524998d49aae1243c7c333ec823678b145f41482a24"},"schema_version":"1.0","source":{"id":"1910.02983","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1910.02983","created_at":"2026-07-05T00:13:58Z"},{"alias_kind":"arxiv_version","alias_value":"1910.02983v2","created_at":"2026-07-05T00:13:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1910.02983","created_at":"2026-07-05T00:13:58Z"},{"alias_kind":"pith_short_12","alias_value":"G5AITWZ4TYHE","created_at":"2026-07-05T00:13:58Z"},{"alias_kind":"pith_short_16","alias_value":"G5AITWZ4TYHELKHP","created_at":"2026-07-05T00:13:58Z"},{"alias_kind":"pith_short_8","alias_value":"G5AITWZ4","created_at":"2026-07-05T00:13:58Z"}],"graph_snapshots":[{"event_id":"sha256:afe69db7bd944aa73cbff2bf38e06254c14244ff323a116631413c4f88c868a1","target":"graph","created_at":"2026-07-05T00:13:58Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1910.02983/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The morphology of HII regions around young star clusters provides insight into the timescales and physical processes that clear a cluster's natal gas. We study ~700 young clusters (<10Myr) in three nearby spiral galaxies (NGC 7793, NGC 4395, and NGC 1313) using Hubble Space Telescope (HST) imaging from LEGUS (Legacy ExtraGalactic Ultraviolet Survey). Clusters are classified by their H$\\alpha$ morphology (concentrated, partially exposed, no-emission) and whether they have neighboring clusters (which could affect the clearing timescales). Through visual inspection of the HST images, and analysis","authors_text":"A. Adamo, A. Aloisi, A. Herrero, A. Wofford, B.C. Whitmore, B. Mobasher, D.A. Gouliermis, D.A. Hunter, D. Calzetti, D. Dale, D.M. Elmegreen, D.O. Cook, D. Thilker, E.K. Grebel, E. Sacchi, H. Kim, Janice C. Lee, J. Turner, K.E. Johnson, K. Grasha, L. Della Bruna, L. Smith, M. Cignoni, R.A.M. Walterbos, R. Chandar, R. Kennicutt, S. Deger, Stephen Hannon","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-10-07T18:07:44Z","title":"H$\\alpha$ Morphologies of Star Clusters: A LEGUS study of HII region evolution timescales and stochasticity in low mass clusters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1910.02983","kind":"arxiv","version":2},"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":"sha256:03b06cfb408f1a7506c96f39253ca49d952236a2a828a44ded0b0775bd641326","target":"record","created_at":"2026-07-05T00:13:58Z","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":"b733771af0bd150c4ff8ce2cc45fd11c0c7a33b26f1debcde5461bb49a57ac17","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-10-07T18:07:44Z","title_canon_sha256":"01e36f54a1a2f23676b00524998d49aae1243c7c333ec823678b145f41482a24"},"schema_version":"1.0","source":{"id":"1910.02983","kind":"arxiv","version":2}},"canonical_sha256":"374089db3c9e0e45a8ef40751ffdc7bdd0e3487c8353de4182c9c3b25d24eeda","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"374089db3c9e0e45a8ef40751ffdc7bdd0e3487c8353de4182c9c3b25d24eeda","first_computed_at":"2026-07-05T00:13:58.749687Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:13:58.749687Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qkKSxma8cRCsDLJrhKuW88bFpa5lxNRtm5xfu1oSsWeE/7zge96sfC0yXgzc/mKeP/9Aw/mFsMbMqIrL4/X9Cw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:13:58.750182Z","signed_message":"canonical_sha256_bytes"},"source_id":"1910.02983","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:03b06cfb408f1a7506c96f39253ca49d952236a2a828a44ded0b0775bd641326","sha256:afe69db7bd944aa73cbff2bf38e06254c14244ff323a116631413c4f88c868a1"],"state_sha256":"cd27f4b07ad81e64eea03452d42aed86546035fb6499de3b5c53213579c95d13"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+z/idEfZ2mbt7bablvgUsMDSOVypmPptH8/LBRHKpJa4JBLWpmJINbFyFaU4EjtQ0nPZtevmgJDuxf+idOzFCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T17:45:24.328223Z","bundle_sha256":"ff79e887b87f910114d43b4027005568a660301a7ce2ea92483a0c3fdc5042c7"}}