{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1995:UX3ZIPDS4MR5CPU6QJQOS75I5D","short_pith_number":"pith:UX3ZIPDS","canonical_record":{"source":{"id":"astro-ph/9503005","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1995-03-01T14:25:37Z","cross_cats_sorted":[],"title_canon_sha256":"a7306d01c7b1d28213f40597f5ee199eca80c623454d8a3d104389bc9b8e6ca5","abstract_canon_sha256":"115f1c658cae21a4fb86115e94b58a48f81125c88e57ed44eebf78ef129da6c2"},"schema_version":"1.0"},"canonical_sha256":"a5f7943c72e323d13e9e8260e97fa8e8c9e38a13b460f76e179673a268a63485","source":{"kind":"arxiv","id":"astro-ph/9503005","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9503005","created_at":"2026-05-18T01:07:42Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9503005v1","created_at":"2026-05-18T01:07:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9503005","created_at":"2026-05-18T01:07:42Z"},{"alias_kind":"pith_short_12","alias_value":"UX3ZIPDS4MR5","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"UX3ZIPDS4MR5CPU6","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"UX3ZIPDS","created_at":"2026-05-18T12:25:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1995:UX3ZIPDS4MR5CPU6QJQOS75I5D","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9503005","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1995-03-01T14:25:37Z","cross_cats_sorted":[],"title_canon_sha256":"a7306d01c7b1d28213f40597f5ee199eca80c623454d8a3d104389bc9b8e6ca5","abstract_canon_sha256":"115f1c658cae21a4fb86115e94b58a48f81125c88e57ed44eebf78ef129da6c2"},"schema_version":"1.0"},"canonical_sha256":"a5f7943c72e323d13e9e8260e97fa8e8c9e38a13b460f76e179673a268a63485","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:07:42.027873Z","signature_b64":"uESq584//kfOGu2WIXJke6HYjiogZhHSgllCK3/8jQlA0z9aIHWkY1YgkO5+dfraBmFa3uD+Q6xS5oemOZjtBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a5f7943c72e323d13e9e8260e97fa8e8c9e38a13b460f76e179673a268a63485","last_reissued_at":"2026-05-18T01:07:42.027336Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:07:42.027336Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9503005","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":"2026-05-18T01:07:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CDcS0HlpIk8zrnkdUsCuHmQ452donKMDBLy7+yfCVR8jkGe/FwJFLRSIC4j68UOlW3c1y/FSqcusuoRyckVKCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T15:33:58.058444Z"},"content_sha256":"f1b0f2c6ad539ebc93676972486357af335ab947db2c91d795190933553d8f44","schema_version":"1.0","event_id":"sha256:f1b0f2c6ad539ebc93676972486357af335ab947db2c91d795190933553d8f44"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1995:UX3ZIPDS4MR5CPU6QJQOS75I5D","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"New results on the Gunn-Peterson Effect at High Redshift","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Fontana, E. Giallongo, P. Molaro, S. Cristiani, S. D'Odorico, S. Savaglio","submitted_at":"1995-03-01T14:25:37Z","abstract_excerpt":"Attempts to measure the optical depth due to a diffuse intergalactic medium (IGM) in the spectra of high redshift quasars (GP test) within the ESO key program on the intergalactic medium are reviewed. It is shown that there is no evidence for any Gunn-Peterson effect up to the highest redshifts observable in quasar spectra. The Ly$\\alpha$ line statistics consistent with this limit is not able to explain the strong absorption observed at the HeII forest in one QSO, leaving room for a true HeII GP effect. The HI/HeII GP ratio implies a steep ionizing UV background at $z\\sim 5$ and ionizing sourc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9503005","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":"2026-05-18T01:07:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HwrxDOnhPBp9h2BJt5k8wjxGLbyfl4DcXZpfvAA7yRWzSbOeEvklnpTdoUip3VuWoaqleQG8joUhN3Yu5LPtBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T15:33:58.059165Z"},"content_sha256":"890e8ca5e652c1b204cddd9878db9393e4e5013a8b32897b9a6bf830d7ed8a7d","schema_version":"1.0","event_id":"sha256:890e8ca5e652c1b204cddd9878db9393e4e5013a8b32897b9a6bf830d7ed8a7d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UX3ZIPDS4MR5CPU6QJQOS75I5D/bundle.json","state_url":"https://pith.science/pith/UX3ZIPDS4MR5CPU6QJQOS75I5D/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UX3ZIPDS4MR5CPU6QJQOS75I5D/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":"2026-06-08T15:33:58Z","links":{"resolver":"https://pith.science/pith/UX3ZIPDS4MR5CPU6QJQOS75I5D","bundle":"https://pith.science/pith/UX3ZIPDS4MR5CPU6QJQOS75I5D/bundle.json","state":"https://pith.science/pith/UX3ZIPDS4MR5CPU6QJQOS75I5D/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UX3ZIPDS4MR5CPU6QJQOS75I5D/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1995:UX3ZIPDS4MR5CPU6QJQOS75I5D","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":"115f1c658cae21a4fb86115e94b58a48f81125c88e57ed44eebf78ef129da6c2","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1995-03-01T14:25:37Z","title_canon_sha256":"a7306d01c7b1d28213f40597f5ee199eca80c623454d8a3d104389bc9b8e6ca5"},"schema_version":"1.0","source":{"id":"astro-ph/9503005","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9503005","created_at":"2026-05-18T01:07:42Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9503005v1","created_at":"2026-05-18T01:07:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9503005","created_at":"2026-05-18T01:07:42Z"},{"alias_kind":"pith_short_12","alias_value":"UX3ZIPDS4MR5","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"UX3ZIPDS4MR5CPU6","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"UX3ZIPDS","created_at":"2026-05-18T12:25:47Z"}],"graph_snapshots":[{"event_id":"sha256:890e8ca5e652c1b204cddd9878db9393e4e5013a8b32897b9a6bf830d7ed8a7d","target":"graph","created_at":"2026-05-18T01:07:42Z","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":"Attempts to measure the optical depth due to a diffuse intergalactic medium (IGM) in the spectra of high redshift quasars (GP test) within the ESO key program on the intergalactic medium are reviewed. It is shown that there is no evidence for any Gunn-Peterson effect up to the highest redshifts observable in quasar spectra. The Ly$\\alpha$ line statistics consistent with this limit is not able to explain the strong absorption observed at the HeII forest in one QSO, leaving room for a true HeII GP effect. The HI/HeII GP ratio implies a steep ionizing UV background at $z\\sim 5$ and ionizing sourc","authors_text":"A. Fontana, E. Giallongo, P. Molaro, S. Cristiani, S. D'Odorico, S. Savaglio","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1995-03-01T14:25:37Z","title":"New results on the Gunn-Peterson Effect at High Redshift"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9503005","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:f1b0f2c6ad539ebc93676972486357af335ab947db2c91d795190933553d8f44","target":"record","created_at":"2026-05-18T01:07:42Z","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":"115f1c658cae21a4fb86115e94b58a48f81125c88e57ed44eebf78ef129da6c2","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1995-03-01T14:25:37Z","title_canon_sha256":"a7306d01c7b1d28213f40597f5ee199eca80c623454d8a3d104389bc9b8e6ca5"},"schema_version":"1.0","source":{"id":"astro-ph/9503005","kind":"arxiv","version":1}},"canonical_sha256":"a5f7943c72e323d13e9e8260e97fa8e8c9e38a13b460f76e179673a268a63485","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a5f7943c72e323d13e9e8260e97fa8e8c9e38a13b460f76e179673a268a63485","first_computed_at":"2026-05-18T01:07:42.027336Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:07:42.027336Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uESq584//kfOGu2WIXJke6HYjiogZhHSgllCK3/8jQlA0z9aIHWkY1YgkO5+dfraBmFa3uD+Q6xS5oemOZjtBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:07:42.027873Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9503005","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f1b0f2c6ad539ebc93676972486357af335ab947db2c91d795190933553d8f44","sha256:890e8ca5e652c1b204cddd9878db9393e4e5013a8b32897b9a6bf830d7ed8a7d"],"state_sha256":"26695d1565caf79f570a26d221c6be664af516901652f2ae0eb40ec91d6bddec"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aGFBzqDQswtG0wnPLYpCkSoR0VDxN0NBu4TcEDoMVOY8h9Uv1qXajYxzT72x+vQyBeDdS1KVb0fIuimzJvlCAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T15:33:58.063154Z","bundle_sha256":"99470629b0cdd3810dc249099e5482a2d2252baf02ef8841d542ec1740d14f8c"}}