{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:74RAPACKUKHZTAPRPLGY4B2MT7","short_pith_number":"pith:74RAPACK","canonical_record":{"source":{"id":"1601.02024","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-08T21:01:19Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"98d650a250d740f2eedb65579296c5554e363b499f6e7788430059a769939a9d","abstract_canon_sha256":"c7f1efc4d8f44ab56d147a39dbb2c8420a18f3f19bfbcf54b8bf2647f94d8a2d"},"schema_version":"1.0"},"canonical_sha256":"ff2207804aa28f9981f17acd8e074c9ff577f99664b56d88eb85851a56164439","source":{"kind":"arxiv","id":"1601.02024","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.02024","created_at":"2026-05-18T01:21:25Z"},{"alias_kind":"arxiv_version","alias_value":"1601.02024v1","created_at":"2026-05-18T01:21:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.02024","created_at":"2026-05-18T01:21:25Z"},{"alias_kind":"pith_short_12","alias_value":"74RAPACKUKHZ","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_16","alias_value":"74RAPACKUKHZTAPR","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_8","alias_value":"74RAPACK","created_at":"2026-05-18T12:30:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:74RAPACKUKHZTAPRPLGY4B2MT7","target":"record","payload":{"canonical_record":{"source":{"id":"1601.02024","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-08T21:01:19Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"98d650a250d740f2eedb65579296c5554e363b499f6e7788430059a769939a9d","abstract_canon_sha256":"c7f1efc4d8f44ab56d147a39dbb2c8420a18f3f19bfbcf54b8bf2647f94d8a2d"},"schema_version":"1.0"},"canonical_sha256":"ff2207804aa28f9981f17acd8e074c9ff577f99664b56d88eb85851a56164439","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:21:25.393098Z","signature_b64":"oOVRA6te744yxx2uacABIS7nLQOT9OLK/2OaydAnSS9YT9EAHUVrL+gk13R0yLqaVQwiQS3cJgQYxvqP2deRAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ff2207804aa28f9981f17acd8e074c9ff577f99664b56d88eb85851a56164439","last_reissued_at":"2026-05-18T01:21:25.392441Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:21:25.392441Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1601.02024","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":"2026-05-18T01:21:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"glBYUt+QB38sVLyEafNJIrvGXsCJCz9RPg28MoYeTSoH+pVkCAtw6vYRRTX1d3Twt5db1f2wbB1sFbGcxwgXDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T15:46:03.558597Z"},"content_sha256":"1c5af41b7eeadcade51232dd33ba0e6a17efc15439e6187f831d56fb5718c3a2","schema_version":"1.0","event_id":"sha256:1c5af41b7eeadcade51232dd33ba0e6a17efc15439e6187f831d56fb5718c3a2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:74RAPACKUKHZTAPRPLGY4B2MT7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Is the Escape Velocity in Star Clusters Linked to Extended Star Formation Histories? Using NGC 7252: W3 as a Test Case","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"A. Mej\\'ia-Narv\\'aez, B. Davies, F. Niederhofer, F. Schweizer, G. Bruzual, G. Magris, I. Cabrera-Ziri, J. M. D. Kruijssen, M. Hilker, M. Rejkuba, N. Bastian, T. D. Brandt","submitted_at":"2016-01-08T21:01:19Z","abstract_excerpt":"The colour-magnitude diagrams of some intermediate-age clusters (1-2 Gyr) star clusters show unexpectedly broad main-sequence turnoffs, raising the possibility that these clusters have experienced more than one episode of star formation. Such a scenario predicts the existence of an extended main sequence turn off (eMSTO) only in clusters with escape velocities above a certain threshold ($>15$ km s$^{-1}$), which would allow them to retain or accrete gas that eventually would fuel a secondary extended star-formation episode. This paper presents a test of this scenario based on the study of the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.02024","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":"2026-05-18T01:21:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RfvKQ8zk/9zxPSLyyRyHCxVAKo39GtBk1fEqCmJDKQRhRatwKnFJZM1i7CMd+FFQRzxMXRDYcRbpn7zCQye7DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T15:46:03.559248Z"},"content_sha256":"71541c18b0edfb6e93ffc0de58f7211e0a8791e40e19e63cb779c707c8df9e29","schema_version":"1.0","event_id":"sha256:71541c18b0edfb6e93ffc0de58f7211e0a8791e40e19e63cb779c707c8df9e29"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/74RAPACKUKHZTAPRPLGY4B2MT7/bundle.json","state_url":"https://pith.science/pith/74RAPACKUKHZTAPRPLGY4B2MT7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/74RAPACKUKHZTAPRPLGY4B2MT7/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":"2026-05-28T15:46:03Z","links":{"resolver":"https://pith.science/pith/74RAPACKUKHZTAPRPLGY4B2MT7","bundle":"https://pith.science/pith/74RAPACKUKHZTAPRPLGY4B2MT7/bundle.json","state":"https://pith.science/pith/74RAPACKUKHZTAPRPLGY4B2MT7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/74RAPACKUKHZTAPRPLGY4B2MT7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:74RAPACKUKHZTAPRPLGY4B2MT7","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":"c7f1efc4d8f44ab56d147a39dbb2c8420a18f3f19bfbcf54b8bf2647f94d8a2d","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-08T21:01:19Z","title_canon_sha256":"98d650a250d740f2eedb65579296c5554e363b499f6e7788430059a769939a9d"},"schema_version":"1.0","source":{"id":"1601.02024","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.02024","created_at":"2026-05-18T01:21:25Z"},{"alias_kind":"arxiv_version","alias_value":"1601.02024v1","created_at":"2026-05-18T01:21:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.02024","created_at":"2026-05-18T01:21:25Z"},{"alias_kind":"pith_short_12","alias_value":"74RAPACKUKHZ","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_16","alias_value":"74RAPACKUKHZTAPR","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_8","alias_value":"74RAPACK","created_at":"2026-05-18T12:30:04Z"}],"graph_snapshots":[{"event_id":"sha256:71541c18b0edfb6e93ffc0de58f7211e0a8791e40e19e63cb779c707c8df9e29","target":"graph","created_at":"2026-05-18T01:21:25Z","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":"The colour-magnitude diagrams of some intermediate-age clusters (1-2 Gyr) star clusters show unexpectedly broad main-sequence turnoffs, raising the possibility that these clusters have experienced more than one episode of star formation. Such a scenario predicts the existence of an extended main sequence turn off (eMSTO) only in clusters with escape velocities above a certain threshold ($>15$ km s$^{-1}$), which would allow them to retain or accrete gas that eventually would fuel a secondary extended star-formation episode. This paper presents a test of this scenario based on the study of the ","authors_text":"A. Mej\\'ia-Narv\\'aez, B. Davies, F. Niederhofer, F. Schweizer, G. Bruzual, G. Magris, I. Cabrera-Ziri, J. M. D. Kruijssen, M. Hilker, M. Rejkuba, N. Bastian, T. D. Brandt","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-08T21:01:19Z","title":"Is the Escape Velocity in Star Clusters Linked to Extended Star Formation Histories? Using NGC 7252: W3 as a Test Case"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.02024","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":"sha256:1c5af41b7eeadcade51232dd33ba0e6a17efc15439e6187f831d56fb5718c3a2","target":"record","created_at":"2026-05-18T01:21:25Z","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":"c7f1efc4d8f44ab56d147a39dbb2c8420a18f3f19bfbcf54b8bf2647f94d8a2d","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-01-08T21:01:19Z","title_canon_sha256":"98d650a250d740f2eedb65579296c5554e363b499f6e7788430059a769939a9d"},"schema_version":"1.0","source":{"id":"1601.02024","kind":"arxiv","version":1}},"canonical_sha256":"ff2207804aa28f9981f17acd8e074c9ff577f99664b56d88eb85851a56164439","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ff2207804aa28f9981f17acd8e074c9ff577f99664b56d88eb85851a56164439","first_computed_at":"2026-05-18T01:21:25.392441Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:21:25.392441Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oOVRA6te744yxx2uacABIS7nLQOT9OLK/2OaydAnSS9YT9EAHUVrL+gk13R0yLqaVQwiQS3cJgQYxvqP2deRAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:21:25.393098Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.02024","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1c5af41b7eeadcade51232dd33ba0e6a17efc15439e6187f831d56fb5718c3a2","sha256:71541c18b0edfb6e93ffc0de58f7211e0a8791e40e19e63cb779c707c8df9e29"],"state_sha256":"805527969c32fef0926bac96bfcc689ee0c2e37882f28582c1d9cb4500bbc94c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nZuhRXgAGgwle+5gSa4RL4rPYY6IxP+LSCrG2933WVGdjKHz4y7reDefKuzD/4o0Po9JF+6kQeUyvVtnM38aDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T15:46:03.562706Z","bundle_sha256":"b73a5a959d91d3f46e17cef2ccfb62269ab49b707b826ce5a91506b1c7b09bd0"}}