{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:WIOYSMXLLJOJJ4AFYS2EDEVUMN","short_pith_number":"pith:WIOYSMXL","canonical_record":{"source":{"id":"0909.0272","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-01T20:13:04Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"7f891d080517b20c1d4c4369f1e43e025eb0d99d5c87ddd5228579319ff201f6","abstract_canon_sha256":"98702334665e5346bc2e94c372b8675e7c2532603a57e4551b81fa41259f59c3"},"schema_version":"1.0"},"canonical_sha256":"b21d8932eb5a5c94f005c4b44192b4637d7652b31788e231f23dfca84d352f51","source":{"kind":"arxiv","id":"0909.0272","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.0272","created_at":"2026-05-18T02:34:36Z"},{"alias_kind":"arxiv_version","alias_value":"0909.0272v1","created_at":"2026-05-18T02:34:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.0272","created_at":"2026-05-18T02:34:36Z"},{"alias_kind":"pith_short_12","alias_value":"WIOYSMXLLJOJ","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"WIOYSMXLLJOJJ4AF","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"WIOYSMXL","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:WIOYSMXLLJOJJ4AFYS2EDEVUMN","target":"record","payload":{"canonical_record":{"source":{"id":"0909.0272","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-01T20:13:04Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"7f891d080517b20c1d4c4369f1e43e025eb0d99d5c87ddd5228579319ff201f6","abstract_canon_sha256":"98702334665e5346bc2e94c372b8675e7c2532603a57e4551b81fa41259f59c3"},"schema_version":"1.0"},"canonical_sha256":"b21d8932eb5a5c94f005c4b44192b4637d7652b31788e231f23dfca84d352f51","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:36.863933Z","signature_b64":"Tk60LoJnrYeIpCZvrxCR8k8a5AHvSMk+zE9EzrSqBBY0tD6EkLcTFejtGLr8durYY8cfCFo4xlmD2BAXNc16Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b21d8932eb5a5c94f005c4b44192b4637d7652b31788e231f23dfca84d352f51","last_reissued_at":"2026-05-18T02:34:36.863496Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:36.863496Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0909.0272","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":"2026-05-18T02:34:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6q/dJy/9u/8Ghn3zFro4IRcQqT6FZDjKXxeGLFJuRGyTY/+6wsWo5YTF2gTbzKIgHUVCC0Ga4S1sHzJ7FpnKDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T04:51:49.295575Z"},"content_sha256":"fa56d383f0d9aaf01137e4c6a110b3d89ae8cd0c6c0330529e6bfc76588bd489","schema_version":"1.0","event_id":"sha256:fa56d383f0d9aaf01137e4c6a110b3d89ae8cd0c6c0330529e6bfc76588bd489"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:WIOYSMXLLJOJJ4AFYS2EDEVUMN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Structural Parameters of the M87 Globular Clusters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Canada), Chile), John P. Blakeslee (Herzberg Institute of Astrophysics, Juan P. Madrid, Matias Gomez (Universidad Andres Bello, William E. Harris (McMaster University","submitted_at":"2009-09-01T20:13:04Z","abstract_excerpt":"We derive structural parameters for ~2000 globular clusters in the giant Virgo elliptical M87 using extremely deep Hubble Space Telescope images in F606W (V) and F814W (I) taken with the ACS/WFC. The cluster scale sizes (half-light radii r_h) and ellipticities are determined from PSF-convolved King-model profile fitting. We find that the r_h distribution closely resembles the inner Milky Way clusters, peaking at r_h~2.5 pc and with virtually no clusters more compact than r_h ~ 1 pc. The metal-poor clusters have on average an r_h 24% larger than the metal-rich ones. The cluster scale size shows"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.0272","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":"2026-05-18T02:34:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/QbLzgAv4h5/gNqNlyKIIbd9sw12o6SfCLWYs9X6WEeNWTcrU9ssmW1Dc0jvpUTqYM4uqquNsiDjhdD+BVSNDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T04:51:49.296232Z"},"content_sha256":"b223a7fa2361301a31c33000a4abceb21e19e3c6bdd2aabb17d235c3f8fb207d","schema_version":"1.0","event_id":"sha256:b223a7fa2361301a31c33000a4abceb21e19e3c6bdd2aabb17d235c3f8fb207d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WIOYSMXLLJOJJ4AFYS2EDEVUMN/bundle.json","state_url":"https://pith.science/pith/WIOYSMXLLJOJJ4AFYS2EDEVUMN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WIOYSMXLLJOJJ4AFYS2EDEVUMN/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":"2026-06-05T04:51:49Z","links":{"resolver":"https://pith.science/pith/WIOYSMXLLJOJJ4AFYS2EDEVUMN","bundle":"https://pith.science/pith/WIOYSMXLLJOJJ4AFYS2EDEVUMN/bundle.json","state":"https://pith.science/pith/WIOYSMXLLJOJJ4AFYS2EDEVUMN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WIOYSMXLLJOJJ4AFYS2EDEVUMN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:WIOYSMXLLJOJJ4AFYS2EDEVUMN","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":"98702334665e5346bc2e94c372b8675e7c2532603a57e4551b81fa41259f59c3","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-01T20:13:04Z","title_canon_sha256":"7f891d080517b20c1d4c4369f1e43e025eb0d99d5c87ddd5228579319ff201f6"},"schema_version":"1.0","source":{"id":"0909.0272","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.0272","created_at":"2026-05-18T02:34:36Z"},{"alias_kind":"arxiv_version","alias_value":"0909.0272v1","created_at":"2026-05-18T02:34:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.0272","created_at":"2026-05-18T02:34:36Z"},{"alias_kind":"pith_short_12","alias_value":"WIOYSMXLLJOJ","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"WIOYSMXLLJOJJ4AF","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"WIOYSMXL","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:b223a7fa2361301a31c33000a4abceb21e19e3c6bdd2aabb17d235c3f8fb207d","target":"graph","created_at":"2026-05-18T02:34:36Z","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 derive structural parameters for ~2000 globular clusters in the giant Virgo elliptical M87 using extremely deep Hubble Space Telescope images in F606W (V) and F814W (I) taken with the ACS/WFC. The cluster scale sizes (half-light radii r_h) and ellipticities are determined from PSF-convolved King-model profile fitting. We find that the r_h distribution closely resembles the inner Milky Way clusters, peaking at r_h~2.5 pc and with virtually no clusters more compact than r_h ~ 1 pc. The metal-poor clusters have on average an r_h 24% larger than the metal-rich ones. The cluster scale size shows","authors_text":"Canada), Chile), John P. Blakeslee (Herzberg Institute of Astrophysics, Juan P. Madrid, Matias Gomez (Universidad Andres Bello, William E. Harris (McMaster University","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-01T20:13:04Z","title":"Structural Parameters of the M87 Globular Clusters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.0272","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:fa56d383f0d9aaf01137e4c6a110b3d89ae8cd0c6c0330529e6bfc76588bd489","target":"record","created_at":"2026-05-18T02:34:36Z","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":"98702334665e5346bc2e94c372b8675e7c2532603a57e4551b81fa41259f59c3","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-01T20:13:04Z","title_canon_sha256":"7f891d080517b20c1d4c4369f1e43e025eb0d99d5c87ddd5228579319ff201f6"},"schema_version":"1.0","source":{"id":"0909.0272","kind":"arxiv","version":1}},"canonical_sha256":"b21d8932eb5a5c94f005c4b44192b4637d7652b31788e231f23dfca84d352f51","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b21d8932eb5a5c94f005c4b44192b4637d7652b31788e231f23dfca84d352f51","first_computed_at":"2026-05-18T02:34:36.863496Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:34:36.863496Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Tk60LoJnrYeIpCZvrxCR8k8a5AHvSMk+zE9EzrSqBBY0tD6EkLcTFejtGLr8durYY8cfCFo4xlmD2BAXNc16Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T02:34:36.863933Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.0272","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fa56d383f0d9aaf01137e4c6a110b3d89ae8cd0c6c0330529e6bfc76588bd489","sha256:b223a7fa2361301a31c33000a4abceb21e19e3c6bdd2aabb17d235c3f8fb207d"],"state_sha256":"6d499584a503d35c9bec3561dd707c5a1e5e8cc0d07b656927a6ebf53f3b96f1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bzrAEzeNjXcmowPIPa3mRFIknn65Caf0NDB8Hz01n0oXpRGd5XW9u8u27iOSMVzwMZ+JHetjmgMOO25340lVDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T04:51:49.299802Z","bundle_sha256":"bdbb56abe2595f655da87a017b397f4e7d3ba2882b21a64070c8efb171e9a700"}}