{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:66VWOQ3FHKO7DLHIAWWHSNUDNN","short_pith_number":"pith:66VWOQ3F","canonical_record":{"source":{"id":"1908.08549","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-22T18:01:14Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"23b910c1d49a8a98aec6b3398539cf5fff9a0b222b312555b45054e4a7812e7b","abstract_canon_sha256":"a2b071b50bb0580fb3e1a1084750c27cbf7483d56dac7f8fa114f41af376d45b"},"schema_version":"1.0"},"canonical_sha256":"f7ab6743653a9df1ace805ac7936836b6189c6fdad69808e9b981debf6a27886","source":{"kind":"arxiv","id":"1908.08549","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.08549","created_at":"2026-07-04T23:59:15Z"},{"alias_kind":"arxiv_version","alias_value":"1908.08549v1","created_at":"2026-07-04T23:59:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.08549","created_at":"2026-07-04T23:59:15Z"},{"alias_kind":"pith_short_12","alias_value":"66VWOQ3FHKO7","created_at":"2026-07-04T23:59:15Z"},{"alias_kind":"pith_short_16","alias_value":"66VWOQ3FHKO7DLHI","created_at":"2026-07-04T23:59:15Z"},{"alias_kind":"pith_short_8","alias_value":"66VWOQ3F","created_at":"2026-07-04T23:59:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:66VWOQ3FHKO7DLHIAWWHSNUDNN","target":"record","payload":{"canonical_record":{"source":{"id":"1908.08549","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-22T18:01:14Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"23b910c1d49a8a98aec6b3398539cf5fff9a0b222b312555b45054e4a7812e7b","abstract_canon_sha256":"a2b071b50bb0580fb3e1a1084750c27cbf7483d56dac7f8fa114f41af376d45b"},"schema_version":"1.0"},"canonical_sha256":"f7ab6743653a9df1ace805ac7936836b6189c6fdad69808e9b981debf6a27886","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:59:15.373371Z","signature_b64":"0nwSIxxPXBnWbq0WVlUp9C6YRWUe3iJJDAuiShWYUpfe6ACz4mtrJD91IGQyIDOKgPa4z8XGvcqnaPHUuAXUAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f7ab6743653a9df1ace805ac7936836b6189c6fdad69808e9b981debf6a27886","last_reissued_at":"2026-07-04T23:59:15.372928Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:59:15.372928Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.08549","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":"2026-07-04T23:59:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Agi4GtXLyeJXiTmAIT2UG4MIICUPpPt1V7MX3Q860pkrB+Im2biaI9IEYCr3y6JlkIjb4SvHv3YW5PoM1XHYBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T06:33:21.229211Z"},"content_sha256":"d3efb2f12cf808fd905336ac0f855e490604d4bb88088f7c96698b1166464dca","schema_version":"1.0","event_id":"sha256:d3efb2f12cf808fd905336ac0f855e490604d4bb88088f7c96698b1166464dca"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:66VWOQ3FHKO7DLHIAWWHSNUDNN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Evolution of Neutral Oxygen During the Epoch of Reionization and its Use in Estimating the Neutral Hydrogen Fraction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Caitlin Doughty, Kristian Finlator","submitted_at":"2019-08-22T18:01:14Z","abstract_excerpt":"We use synthetic sightlines drawn through snapshots of the Technicolor Dawn simulations to explore how the statistics of neutral oxygen OI absorbers respond to hydrogen reionization. The ionization state of the circumgalactic medium (CGM) initially roughly tracks that of the intergalactic medium, but beginning at $z=8$ the CGM grows systematically more neutral owing to self-shielding. Weak absorbers trace diffuse gas that lies farther from halos, hence they are ionized first, whereas stronger systems are less sensitive to reionization. The overall OI covering fraction decreases slowly with tim"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.08549","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/1908.08549/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":"2026-07-04T23:59:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V+uMXieNiZ0YDDIbHG66Ec5bGA/VHphgTSTwmTPiHd4BSb6gCueCZx/ZqZVKU3wvb9k5DYfWikSFb1bVaHkgCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T06:33:21.230106Z"},"content_sha256":"9efbf5a8d47830429c98963c35872fe7502b785341ce7cc39769411680105d4d","schema_version":"1.0","event_id":"sha256:9efbf5a8d47830429c98963c35872fe7502b785341ce7cc39769411680105d4d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/66VWOQ3FHKO7DLHIAWWHSNUDNN/bundle.json","state_url":"https://pith.science/pith/66VWOQ3FHKO7DLHIAWWHSNUDNN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/66VWOQ3FHKO7DLHIAWWHSNUDNN/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":"2026-08-16T06:33:21Z","links":{"resolver":"https://pith.science/pith/66VWOQ3FHKO7DLHIAWWHSNUDNN","bundle":"https://pith.science/pith/66VWOQ3FHKO7DLHIAWWHSNUDNN/bundle.json","state":"https://pith.science/pith/66VWOQ3FHKO7DLHIAWWHSNUDNN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/66VWOQ3FHKO7DLHIAWWHSNUDNN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:66VWOQ3FHKO7DLHIAWWHSNUDNN","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":"a2b071b50bb0580fb3e1a1084750c27cbf7483d56dac7f8fa114f41af376d45b","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-22T18:01:14Z","title_canon_sha256":"23b910c1d49a8a98aec6b3398539cf5fff9a0b222b312555b45054e4a7812e7b"},"schema_version":"1.0","source":{"id":"1908.08549","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.08549","created_at":"2026-07-04T23:59:15Z"},{"alias_kind":"arxiv_version","alias_value":"1908.08549v1","created_at":"2026-07-04T23:59:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.08549","created_at":"2026-07-04T23:59:15Z"},{"alias_kind":"pith_short_12","alias_value":"66VWOQ3FHKO7","created_at":"2026-07-04T23:59:15Z"},{"alias_kind":"pith_short_16","alias_value":"66VWOQ3FHKO7DLHI","created_at":"2026-07-04T23:59:15Z"},{"alias_kind":"pith_short_8","alias_value":"66VWOQ3F","created_at":"2026-07-04T23:59:15Z"}],"graph_snapshots":[{"event_id":"sha256:9efbf5a8d47830429c98963c35872fe7502b785341ce7cc39769411680105d4d","target":"graph","created_at":"2026-07-04T23:59:15Z","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/1908.08549/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We use synthetic sightlines drawn through snapshots of the Technicolor Dawn simulations to explore how the statistics of neutral oxygen OI absorbers respond to hydrogen reionization. The ionization state of the circumgalactic medium (CGM) initially roughly tracks that of the intergalactic medium, but beginning at $z=8$ the CGM grows systematically more neutral owing to self-shielding. Weak absorbers trace diffuse gas that lies farther from halos, hence they are ionized first, whereas stronger systems are less sensitive to reionization. The overall OI covering fraction decreases slowly with tim","authors_text":"Caitlin Doughty, Kristian Finlator","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-22T18:01:14Z","title":"Evolution of Neutral Oxygen During the Epoch of Reionization and its Use in Estimating the Neutral Hydrogen Fraction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.08549","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:d3efb2f12cf808fd905336ac0f855e490604d4bb88088f7c96698b1166464dca","target":"record","created_at":"2026-07-04T23:59:15Z","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":"a2b071b50bb0580fb3e1a1084750c27cbf7483d56dac7f8fa114f41af376d45b","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-22T18:01:14Z","title_canon_sha256":"23b910c1d49a8a98aec6b3398539cf5fff9a0b222b312555b45054e4a7812e7b"},"schema_version":"1.0","source":{"id":"1908.08549","kind":"arxiv","version":1}},"canonical_sha256":"f7ab6743653a9df1ace805ac7936836b6189c6fdad69808e9b981debf6a27886","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f7ab6743653a9df1ace805ac7936836b6189c6fdad69808e9b981debf6a27886","first_computed_at":"2026-07-04T23:59:15.372928Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:59:15.372928Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0nwSIxxPXBnWbq0WVlUp9C6YRWUe3iJJDAuiShWYUpfe6ACz4mtrJD91IGQyIDOKgPa4z8XGvcqnaPHUuAXUAA==","signature_status":"signed_v1","signed_at":"2026-07-04T23:59:15.373371Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.08549","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d3efb2f12cf808fd905336ac0f855e490604d4bb88088f7c96698b1166464dca","sha256:9efbf5a8d47830429c98963c35872fe7502b785341ce7cc39769411680105d4d"],"state_sha256":"497210e8c25a2117b55d326632d3647bc9c9cc06e456ff2c0fbb3cd76ea0cbd1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7bsFpdQvz0BWviSTMUjeLMCwvBPhrgRVNZh6KstnL8/Ye3RmZAwKf+LUyEJZFoZtvs2FYOsKHr8/xvvfqdPIBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T06:33:21.235562Z","bundle_sha256":"a2871a033f924565c3bce8f03a53ba22b7c58765c862f45e71c0c9a9fc5e5a08"}}