{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:2OOD3KLGFLRTNPJ7HPGAK7P5LL","short_pith_number":"pith:2OOD3KLG","canonical_record":{"source":{"id":"0803.2512","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-03-17T20:00:15Z","cross_cats_sorted":[],"title_canon_sha256":"cd433aee9bd807244bb622f33c0cfcb88710ba28ea4c4ab5393cb32172735280","abstract_canon_sha256":"5be0dc1169bdc2eaf8854401470c862b44e137df3f025815d8c18dc88a40e06f"},"schema_version":"1.0"},"canonical_sha256":"d39c3da9662ae336bd3f3bcc057dfd5ac15a5e7969a14d5c5a20201227012aa1","source":{"kind":"arxiv","id":"0803.2512","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0803.2512","created_at":"2026-07-04T17:09:52Z"},{"alias_kind":"arxiv_version","alias_value":"0803.2512v1","created_at":"2026-07-04T17:09:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0803.2512","created_at":"2026-07-04T17:09:52Z"},{"alias_kind":"pith_short_12","alias_value":"2OOD3KLGFLRT","created_at":"2026-07-04T17:09:52Z"},{"alias_kind":"pith_short_16","alias_value":"2OOD3KLGFLRTNPJ7","created_at":"2026-07-04T17:09:52Z"},{"alias_kind":"pith_short_8","alias_value":"2OOD3KLG","created_at":"2026-07-04T17:09:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:2OOD3KLGFLRTNPJ7HPGAK7P5LL","target":"record","payload":{"canonical_record":{"source":{"id":"0803.2512","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-03-17T20:00:15Z","cross_cats_sorted":[],"title_canon_sha256":"cd433aee9bd807244bb622f33c0cfcb88710ba28ea4c4ab5393cb32172735280","abstract_canon_sha256":"5be0dc1169bdc2eaf8854401470c862b44e137df3f025815d8c18dc88a40e06f"},"schema_version":"1.0"},"canonical_sha256":"d39c3da9662ae336bd3f3bcc057dfd5ac15a5e7969a14d5c5a20201227012aa1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:09:52.172383Z","signature_b64":"riPnDW/+sWhzKbmidAIWo5KFAFVVvS0jwGyUYkrRy2Q7Qhv0kgqUPIIYxij4skpFh4aL3njRHD3A8kAhA+18AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d39c3da9662ae336bd3f3bcc057dfd5ac15a5e7969a14d5c5a20201227012aa1","last_reissued_at":"2026-07-04T17:09:52.172047Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:09:52.172047Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0803.2512","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":"2026-07-04T17:09:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IFS+ThoYx4iRGEgcYg3CQQ3AKzFcqG/fnvtVZSDCJyMrlVAHs2kq4yjMN4bjGjRaZGpisPl1riZtnMF89PijDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-13T14:33:30.315913Z"},"content_sha256":"d2d17915d36b2159832644a4f8d18fc5f4f83a09f019714c13815b338d7e2be5","schema_version":"1.0","event_id":"sha256:d2d17915d36b2159832644a4f8d18fc5f4f83a09f019714c13815b338d7e2be5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:2OOD3KLGFLRTNPJ7HPGAK7P5LL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Stellar age versus mass of early-type galaxies in the Virgo Cluster","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences), Thorsten Lisker (1), University of Heidelberg, Zhanwen Han (2) ((1) ARI/Zentrum fuer Astronomie","submitted_at":"2008-03-17T20:00:15Z","abstract_excerpt":"The flux excess of elliptical galaxies in the far-ultraviolet can be reproduced by population synthesis models when accounting for the population of old hot helium-burning subdwarf stars. This has been achieved by Han and coworkers through a quantitative model of binary stellar evolution. Here, we compare the resulting evolutionary population synthesis model to the GALEX far-near ultraviolet colors (FUV-NUV) of Virgo cluster early-type galaxies that were published by Boselli and coworkers. FUV-NUV is reddest at about the dividing luminosity of dwarf and giant galaxies, and becomes increasingly"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0803.2512","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/0803.2512/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":"2026-07-04T17:09:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"f9f9+B9yzK0ifLrsHwgbHVfojTbae+rKfHaH9EBPyTOKGC09thdv4oqNbgSbKUijzVg0Rj8ZAq9ChYzUYImFBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-13T14:33:30.316273Z"},"content_sha256":"774f0298ef44cb39c9ce5feeafc44531f42ae6b3df9beb97498844e7d1fff967","schema_version":"1.0","event_id":"sha256:774f0298ef44cb39c9ce5feeafc44531f42ae6b3df9beb97498844e7d1fff967"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2OOD3KLGFLRTNPJ7HPGAK7P5LL/bundle.json","state_url":"https://pith.science/pith/2OOD3KLGFLRTNPJ7HPGAK7P5LL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2OOD3KLGFLRTNPJ7HPGAK7P5LL/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":"2026-07-13T14:33:30Z","links":{"resolver":"https://pith.science/pith/2OOD3KLGFLRTNPJ7HPGAK7P5LL","bundle":"https://pith.science/pith/2OOD3KLGFLRTNPJ7HPGAK7P5LL/bundle.json","state":"https://pith.science/pith/2OOD3KLGFLRTNPJ7HPGAK7P5LL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2OOD3KLGFLRTNPJ7HPGAK7P5LL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:2OOD3KLGFLRTNPJ7HPGAK7P5LL","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":"5be0dc1169bdc2eaf8854401470c862b44e137df3f025815d8c18dc88a40e06f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-03-17T20:00:15Z","title_canon_sha256":"cd433aee9bd807244bb622f33c0cfcb88710ba28ea4c4ab5393cb32172735280"},"schema_version":"1.0","source":{"id":"0803.2512","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0803.2512","created_at":"2026-07-04T17:09:52Z"},{"alias_kind":"arxiv_version","alias_value":"0803.2512v1","created_at":"2026-07-04T17:09:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0803.2512","created_at":"2026-07-04T17:09:52Z"},{"alias_kind":"pith_short_12","alias_value":"2OOD3KLGFLRT","created_at":"2026-07-04T17:09:52Z"},{"alias_kind":"pith_short_16","alias_value":"2OOD3KLGFLRTNPJ7","created_at":"2026-07-04T17:09:52Z"},{"alias_kind":"pith_short_8","alias_value":"2OOD3KLG","created_at":"2026-07-04T17:09:52Z"}],"graph_snapshots":[{"event_id":"sha256:774f0298ef44cb39c9ce5feeafc44531f42ae6b3df9beb97498844e7d1fff967","target":"graph","created_at":"2026-07-04T17:09:52Z","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/0803.2512/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The flux excess of elliptical galaxies in the far-ultraviolet can be reproduced by population synthesis models when accounting for the population of old hot helium-burning subdwarf stars. This has been achieved by Han and coworkers through a quantitative model of binary stellar evolution. Here, we compare the resulting evolutionary population synthesis model to the GALEX far-near ultraviolet colors (FUV-NUV) of Virgo cluster early-type galaxies that were published by Boselli and coworkers. FUV-NUV is reddest at about the dividing luminosity of dwarf and giant galaxies, and becomes increasingly","authors_text":"(2) National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences), Thorsten Lisker (1), University of Heidelberg, Zhanwen Han (2) ((1) ARI/Zentrum fuer Astronomie","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-03-17T20:00:15Z","title":"Stellar age versus mass of early-type galaxies in the Virgo Cluster"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0803.2512","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:d2d17915d36b2159832644a4f8d18fc5f4f83a09f019714c13815b338d7e2be5","target":"record","created_at":"2026-07-04T17:09:52Z","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":"5be0dc1169bdc2eaf8854401470c862b44e137df3f025815d8c18dc88a40e06f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-03-17T20:00:15Z","title_canon_sha256":"cd433aee9bd807244bb622f33c0cfcb88710ba28ea4c4ab5393cb32172735280"},"schema_version":"1.0","source":{"id":"0803.2512","kind":"arxiv","version":1}},"canonical_sha256":"d39c3da9662ae336bd3f3bcc057dfd5ac15a5e7969a14d5c5a20201227012aa1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d39c3da9662ae336bd3f3bcc057dfd5ac15a5e7969a14d5c5a20201227012aa1","first_computed_at":"2026-07-04T17:09:52.172047Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:09:52.172047Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"riPnDW/+sWhzKbmidAIWo5KFAFVVvS0jwGyUYkrRy2Q7Qhv0kgqUPIIYxij4skpFh4aL3njRHD3A8kAhA+18AA==","signature_status":"signed_v1","signed_at":"2026-07-04T17:09:52.172383Z","signed_message":"canonical_sha256_bytes"},"source_id":"0803.2512","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d2d17915d36b2159832644a4f8d18fc5f4f83a09f019714c13815b338d7e2be5","sha256:774f0298ef44cb39c9ce5feeafc44531f42ae6b3df9beb97498844e7d1fff967"],"state_sha256":"d7e14167b2cdf63da4b9e8da74ce8cedb88669ece393c631b1ba55b4944f8b3a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3B9+xzrYRYoxHRo/QjXlxZ0fPGm7qnZsRbvcgTBtGA47OcjK2FMLbDw8q6crnRmb1L0ptaT9PjYaW5jRzwh4Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-13T14:33:30.318567Z","bundle_sha256":"75904b440ff5619b3027f6815cf8f2e3d83b01f07ad04cbb3d02f9258b7e2af1"}}