{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:L7QHDNEYUU5X54IEAKUHFNKQ52","short_pith_number":"pith:L7QHDNEY","canonical_record":{"source":{"id":"2502.20398","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-02-27T18:59:59Z","cross_cats_sorted":[],"title_canon_sha256":"7ceda66e069907af7a4b87a4388ccc6fa5ff49095de919cc3ce941185676e61e","abstract_canon_sha256":"bcad2b69e649d0b22e253954a141c1a44f3e971f7ae5bf8e24f8f4a04f12d1d0"},"schema_version":"1.0"},"canonical_sha256":"5fe071b498a53b7ef10402a872b550ee8f64d5ab3dc4f1cc4842ea7f67768bcf","source":{"kind":"arxiv","id":"2502.20398","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.20398","created_at":"2026-07-05T11:37:16Z"},{"alias_kind":"arxiv_version","alias_value":"2502.20398v1","created_at":"2026-07-05T11:37:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.20398","created_at":"2026-07-05T11:37:16Z"},{"alias_kind":"pith_short_12","alias_value":"L7QHDNEYUU5X","created_at":"2026-07-05T11:37:16Z"},{"alias_kind":"pith_short_16","alias_value":"L7QHDNEYUU5X54IE","created_at":"2026-07-05T11:37:16Z"},{"alias_kind":"pith_short_8","alias_value":"L7QHDNEY","created_at":"2026-07-05T11:37:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:L7QHDNEYUU5X54IEAKUHFNKQ52","target":"record","payload":{"canonical_record":{"source":{"id":"2502.20398","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-02-27T18:59:59Z","cross_cats_sorted":[],"title_canon_sha256":"7ceda66e069907af7a4b87a4388ccc6fa5ff49095de919cc3ce941185676e61e","abstract_canon_sha256":"bcad2b69e649d0b22e253954a141c1a44f3e971f7ae5bf8e24f8f4a04f12d1d0"},"schema_version":"1.0"},"canonical_sha256":"5fe071b498a53b7ef10402a872b550ee8f64d5ab3dc4f1cc4842ea7f67768bcf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:37:16.434710Z","signature_b64":"nSr3Qt5oK4ibMZAaeHrE3qKJoJ26yCEQEKlibPICGAgxKQtL3dJELat2R9zlGXdMXhdvFbOHty6ZtzJ99EpLCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5fe071b498a53b7ef10402a872b550ee8f64d5ab3dc4f1cc4842ea7f67768bcf","last_reissued_at":"2026-07-05T11:37:16.434208Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:37:16.434208Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2502.20398","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":"2026-07-05T11:37:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2if5JzRf6drVxbR28j4u/cxMIyI9KhWaYB9pPRALoisfggWqgnTBUhhveMDcO7S1lS4QwHtsLr6lI849ouIqDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T03:24:52.259932Z"},"content_sha256":"e4d24377ec5b3618a36908a416fee70b59cec5bc3fce6dab111cd246eed94163","schema_version":"1.0","event_id":"sha256:e4d24377ec5b3618a36908a416fee70b59cec5bc3fce6dab111cd246eed94163"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:L7QHDNEYUU5X54IEAKUHFNKQ52","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A physically motivated galaxy size definition across different state-of-the-art hydrodynamical simulations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alexander Knebe, Andrea V. Maccio, Arianna Di Cintio, Claudio Dalla Vecchia, Elena Arjona-Galvez, Jose A. Benavides, Noam Libeskind, Robert J. J. Grand, Salvador Cardona-Barrero","submitted_at":"2025-02-27T18:59:59Z","abstract_excerpt":"Galaxy sizes are a key parameter to distinguishing between different galaxy types and morphologies, reflecting their formation and assembly histories. Several methods define galaxy boundaries, often relying on light concentration or isophotal densities. However, these approaches were often constrained by observational limitations and did not necessarily provide a clear physical boundary for galaxy outskirts. With modern deep imaging surveys, a new physically motivated definition has emerged using the radial position of the star formation threshold as the galaxy size, approximated by the stella"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.20398","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2502.20398/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":"2026-07-05T11:37:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IaWFlbiyrZWBw/7waEHisFtFsrfQsNQqe+1t324aKF6zapehIcaXQuex0M6+wcLLqg/pKgOFh0mDM4h6Uh3/Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T03:24:52.260319Z"},"content_sha256":"e682e8e9ba58129e0bd3c4588158e7557a652f4a1529012142a588bf264ff1d0","schema_version":"1.0","event_id":"sha256:e682e8e9ba58129e0bd3c4588158e7557a652f4a1529012142a588bf264ff1d0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/L7QHDNEYUU5X54IEAKUHFNKQ52/bundle.json","state_url":"https://pith.science/pith/L7QHDNEYUU5X54IEAKUHFNKQ52/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/L7QHDNEYUU5X54IEAKUHFNKQ52/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":"2026-08-17T03:24:52Z","links":{"resolver":"https://pith.science/pith/L7QHDNEYUU5X54IEAKUHFNKQ52","bundle":"https://pith.science/pith/L7QHDNEYUU5X54IEAKUHFNKQ52/bundle.json","state":"https://pith.science/pith/L7QHDNEYUU5X54IEAKUHFNKQ52/state.json","well_known_bundle":"https://pith.science/.well-known/pith/L7QHDNEYUU5X54IEAKUHFNKQ52/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:L7QHDNEYUU5X54IEAKUHFNKQ52","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":"bcad2b69e649d0b22e253954a141c1a44f3e971f7ae5bf8e24f8f4a04f12d1d0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-02-27T18:59:59Z","title_canon_sha256":"7ceda66e069907af7a4b87a4388ccc6fa5ff49095de919cc3ce941185676e61e"},"schema_version":"1.0","source":{"id":"2502.20398","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.20398","created_at":"2026-07-05T11:37:16Z"},{"alias_kind":"arxiv_version","alias_value":"2502.20398v1","created_at":"2026-07-05T11:37:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.20398","created_at":"2026-07-05T11:37:16Z"},{"alias_kind":"pith_short_12","alias_value":"L7QHDNEYUU5X","created_at":"2026-07-05T11:37:16Z"},{"alias_kind":"pith_short_16","alias_value":"L7QHDNEYUU5X54IE","created_at":"2026-07-05T11:37:16Z"},{"alias_kind":"pith_short_8","alias_value":"L7QHDNEY","created_at":"2026-07-05T11:37:16Z"}],"graph_snapshots":[{"event_id":"sha256:e682e8e9ba58129e0bd3c4588158e7557a652f4a1529012142a588bf264ff1d0","target":"graph","created_at":"2026-07-05T11:37:16Z","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/2502.20398/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Galaxy sizes are a key parameter to distinguishing between different galaxy types and morphologies, reflecting their formation and assembly histories. Several methods define galaxy boundaries, often relying on light concentration or isophotal densities. However, these approaches were often constrained by observational limitations and did not necessarily provide a clear physical boundary for galaxy outskirts. With modern deep imaging surveys, a new physically motivated definition has emerged using the radial position of the star formation threshold as the galaxy size, approximated by the stella","authors_text":"Alexander Knebe, Andrea V. Maccio, Arianna Di Cintio, Claudio Dalla Vecchia, Elena Arjona-Galvez, Jose A. Benavides, Noam Libeskind, Robert J. J. Grand, Salvador Cardona-Barrero","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-02-27T18:59:59Z","title":"A physically motivated galaxy size definition across different state-of-the-art hydrodynamical simulations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.20398","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:e4d24377ec5b3618a36908a416fee70b59cec5bc3fce6dab111cd246eed94163","target":"record","created_at":"2026-07-05T11:37:16Z","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":"bcad2b69e649d0b22e253954a141c1a44f3e971f7ae5bf8e24f8f4a04f12d1d0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-02-27T18:59:59Z","title_canon_sha256":"7ceda66e069907af7a4b87a4388ccc6fa5ff49095de919cc3ce941185676e61e"},"schema_version":"1.0","source":{"id":"2502.20398","kind":"arxiv","version":1}},"canonical_sha256":"5fe071b498a53b7ef10402a872b550ee8f64d5ab3dc4f1cc4842ea7f67768bcf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5fe071b498a53b7ef10402a872b550ee8f64d5ab3dc4f1cc4842ea7f67768bcf","first_computed_at":"2026-07-05T11:37:16.434208Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:37:16.434208Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nSr3Qt5oK4ibMZAaeHrE3qKJoJ26yCEQEKlibPICGAgxKQtL3dJELat2R9zlGXdMXhdvFbOHty6ZtzJ99EpLCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:37:16.434710Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.20398","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e4d24377ec5b3618a36908a416fee70b59cec5bc3fce6dab111cd246eed94163","sha256:e682e8e9ba58129e0bd3c4588158e7557a652f4a1529012142a588bf264ff1d0"],"state_sha256":"f3cb46285fe847c092556cb1144eb91b5e3fc03724aecca157d6912d2c238a16"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R/qAYyJxIoEYKCnVQ2BV2OCMt7TwKtvY7eE5S8Fz8pathUquDslgb83AS0t1/gStvT/UNUrWXdDx6LkHscD9AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-17T03:24:52.262789Z","bundle_sha256":"147114da79b30f6437e19a93736afbfae1dd76f75965bbabf49a07762552af67"}}