{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2000:CDZBPA2YC56QMENME73CKE3VMK","short_pith_number":"pith:CDZBPA2Y","canonical_record":{"source":{"id":"astro-ph/0007351","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2000-07-24T16:18:24Z","cross_cats_sorted":[],"title_canon_sha256":"9de2c8bda3632e9794a68d881f6552d6d50ed1690ba37e36ba66ec53772181ca","abstract_canon_sha256":"13526a4f6e077fd34abf0508160324f634fad13c741f63c97c1cc035bc0ef45b"},"schema_version":"1.0"},"canonical_sha256":"10f2178358177d0611ac27f625137562a3f9f2adfc2b51a14c537be037ddecf3","source":{"kind":"arxiv","id":"astro-ph/0007351","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0007351","created_at":"2026-07-04T16:16:56Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0007351v3","created_at":"2026-07-04T16:16:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0007351","created_at":"2026-07-04T16:16:56Z"},{"alias_kind":"pith_short_12","alias_value":"CDZBPA2YC56Q","created_at":"2026-07-04T16:16:56Z"},{"alias_kind":"pith_short_16","alias_value":"CDZBPA2YC56QMENM","created_at":"2026-07-04T16:16:56Z"},{"alias_kind":"pith_short_8","alias_value":"CDZBPA2Y","created_at":"2026-07-04T16:16:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2000:CDZBPA2YC56QMENME73CKE3VMK","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0007351","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2000-07-24T16:18:24Z","cross_cats_sorted":[],"title_canon_sha256":"9de2c8bda3632e9794a68d881f6552d6d50ed1690ba37e36ba66ec53772181ca","abstract_canon_sha256":"13526a4f6e077fd34abf0508160324f634fad13c741f63c97c1cc035bc0ef45b"},"schema_version":"1.0"},"canonical_sha256":"10f2178358177d0611ac27f625137562a3f9f2adfc2b51a14c537be037ddecf3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:16:56.557231Z","signature_b64":"WfDH6IZFrYT9pOaM/n/do7NjT0p3Xy2TPl6nankekEcYte9gRa2iRKtUGOlk9B7O81EtE+2KWqfP79g38oe8Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"10f2178358177d0611ac27f625137562a3f9f2adfc2b51a14c537be037ddecf3","last_reissued_at":"2026-07-04T16:16:56.556750Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:16:56.556750Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0007351","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:16:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XTNh6t3Ng3j5RQpJ62fCCrpARXmujhyLrbi0f0pOuy+ybpJSdwx4fg3Q70+QeXNkTgNxjza/bS5MlAGMJnMJAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T04:48:14.116408Z"},"content_sha256":"6e99153bfcc1dace46a060730cc9e3554bbc5a11aed924de7d0383d7034084b5","schema_version":"1.0","event_id":"sha256:6e99153bfcc1dace46a060730cc9e3554bbc5a11aed924de7d0383d7034084b5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2000:CDZBPA2YC56QMENME73CKE3VMK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"HeII Recombination Lines From the First Luminous Objects","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Martin J. Rees (Cambridge Univ), S. Peng Oh, Zoltan Haiman (Princeton Univ)","submitted_at":"2000-07-24T16:18:24Z","abstract_excerpt":"The hardness of the ionizing continuum from the first sources of UV radiation plays a crucial role in the reionization of the intergalactic medium (IGM). While usual stellar populations have soft spectra, mini-quasars or metal-free stars with high effective temperatures may emit hard photons, capable of doubly ionizing helium and increasing the IGM temperature. Absorption within the source and in the intervening IGM will render the ionizing continuum of high-redshift sources inaccessible to direct observation. Here we show that HeII recombination lines from the first luminous objects are poten"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0007351","kind":"arxiv","version":3},"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/astro-ph/0007351/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":"2026-07-04T16:16:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zNCgHmEXwCyDBuPfYfXdRG+etX4pTof8Ln/IV9v7JJp/8BlecF68WDag7GRxflLv2a/CpMothouUq3OUzzMeCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T04:48:14.116936Z"},"content_sha256":"01cf6ca1744d9c2c3f0c85c49bc45205b5efc70417cdf3c3016fa388d83b5693","schema_version":"1.0","event_id":"sha256:01cf6ca1744d9c2c3f0c85c49bc45205b5efc70417cdf3c3016fa388d83b5693"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CDZBPA2YC56QMENME73CKE3VMK/bundle.json","state_url":"https://pith.science/pith/CDZBPA2YC56QMENME73CKE3VMK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CDZBPA2YC56QMENME73CKE3VMK/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":"2026-08-22T04:48:14Z","links":{"resolver":"https://pith.science/pith/CDZBPA2YC56QMENME73CKE3VMK","bundle":"https://pith.science/pith/CDZBPA2YC56QMENME73CKE3VMK/bundle.json","state":"https://pith.science/pith/CDZBPA2YC56QMENME73CKE3VMK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CDZBPA2YC56QMENME73CKE3VMK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2000:CDZBPA2YC56QMENME73CKE3VMK","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":"13526a4f6e077fd34abf0508160324f634fad13c741f63c97c1cc035bc0ef45b","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2000-07-24T16:18:24Z","title_canon_sha256":"9de2c8bda3632e9794a68d881f6552d6d50ed1690ba37e36ba66ec53772181ca"},"schema_version":"1.0","source":{"id":"astro-ph/0007351","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0007351","created_at":"2026-07-04T16:16:56Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0007351v3","created_at":"2026-07-04T16:16:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0007351","created_at":"2026-07-04T16:16:56Z"},{"alias_kind":"pith_short_12","alias_value":"CDZBPA2YC56Q","created_at":"2026-07-04T16:16:56Z"},{"alias_kind":"pith_short_16","alias_value":"CDZBPA2YC56QMENM","created_at":"2026-07-04T16:16:56Z"},{"alias_kind":"pith_short_8","alias_value":"CDZBPA2Y","created_at":"2026-07-04T16:16:56Z"}],"graph_snapshots":[{"event_id":"sha256:01cf6ca1744d9c2c3f0c85c49bc45205b5efc70417cdf3c3016fa388d83b5693","target":"graph","created_at":"2026-07-04T16:16:56Z","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/astro-ph/0007351/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The hardness of the ionizing continuum from the first sources of UV radiation plays a crucial role in the reionization of the intergalactic medium (IGM). While usual stellar populations have soft spectra, mini-quasars or metal-free stars with high effective temperatures may emit hard photons, capable of doubly ionizing helium and increasing the IGM temperature. Absorption within the source and in the intervening IGM will render the ionizing continuum of high-redshift sources inaccessible to direct observation. Here we show that HeII recombination lines from the first luminous objects are poten","authors_text":"Martin J. Rees (Cambridge Univ), S. Peng Oh, Zoltan Haiman (Princeton Univ)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2000-07-24T16:18:24Z","title":"HeII Recombination Lines From the First Luminous Objects"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0007351","kind":"arxiv","version":3},"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":"sha256:6e99153bfcc1dace46a060730cc9e3554bbc5a11aed924de7d0383d7034084b5","target":"record","created_at":"2026-07-04T16:16:56Z","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":"13526a4f6e077fd34abf0508160324f634fad13c741f63c97c1cc035bc0ef45b","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2000-07-24T16:18:24Z","title_canon_sha256":"9de2c8bda3632e9794a68d881f6552d6d50ed1690ba37e36ba66ec53772181ca"},"schema_version":"1.0","source":{"id":"astro-ph/0007351","kind":"arxiv","version":3}},"canonical_sha256":"10f2178358177d0611ac27f625137562a3f9f2adfc2b51a14c537be037ddecf3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"10f2178358177d0611ac27f625137562a3f9f2adfc2b51a14c537be037ddecf3","first_computed_at":"2026-07-04T16:16:56.556750Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:16:56.556750Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WfDH6IZFrYT9pOaM/n/do7NjT0p3Xy2TPl6nankekEcYte9gRa2iRKtUGOlk9B7O81EtE+2KWqfP79g38oe8Dg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:16:56.557231Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0007351","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6e99153bfcc1dace46a060730cc9e3554bbc5a11aed924de7d0383d7034084b5","sha256:01cf6ca1744d9c2c3f0c85c49bc45205b5efc70417cdf3c3016fa388d83b5693"],"state_sha256":"6ec34c3dbbd0da6ab9421ddfd644026da91fb0e64cc6029ddb7a7519b6d017c2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/2T4oKg/bcMGeORUzIBEFjT3QBSR+t3Fv6L5oeT1XysNvSNdjBnmjWmRewvSO1EEuXBFNlHXFM+Dxghi6o2PBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T04:48:14.122885Z","bundle_sha256":"cb2fdfa6a3ad7d26d86171253e3d274968f95d26fdfc33d56e255832a87f8325"}}