{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:R7EFESB7WIS5O6DJNZ2LXQM5WQ","short_pith_number":"pith:R7EFESB7","canonical_record":{"source":{"id":"1308.6215","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-28T16:52:33Z","cross_cats_sorted":[],"title_canon_sha256":"8c1199b4c8a9f102682a6a17a06ddfd6f4190269cfd97182e38bd1b5ce3450e9","abstract_canon_sha256":"ce019828a3948cc73f5e94349c09f3508bb57568ff6890dbbb877112eaef2102"},"schema_version":"1.0"},"canonical_sha256":"8fc852483fb225d778696e74bbc19db430df0629d74d87b1cbdae11e86d7cc5f","source":{"kind":"arxiv","id":"1308.6215","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.6215","created_at":"2026-05-18T01:47:57Z"},{"alias_kind":"arxiv_version","alias_value":"1308.6215v1","created_at":"2026-05-18T01:47:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.6215","created_at":"2026-05-18T01:47:57Z"},{"alias_kind":"pith_short_12","alias_value":"R7EFESB7WIS5","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_16","alias_value":"R7EFESB7WIS5O6DJ","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_8","alias_value":"R7EFESB7","created_at":"2026-05-18T12:27:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:R7EFESB7WIS5O6DJNZ2LXQM5WQ","target":"record","payload":{"canonical_record":{"source":{"id":"1308.6215","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-28T16:52:33Z","cross_cats_sorted":[],"title_canon_sha256":"8c1199b4c8a9f102682a6a17a06ddfd6f4190269cfd97182e38bd1b5ce3450e9","abstract_canon_sha256":"ce019828a3948cc73f5e94349c09f3508bb57568ff6890dbbb877112eaef2102"},"schema_version":"1.0"},"canonical_sha256":"8fc852483fb225d778696e74bbc19db430df0629d74d87b1cbdae11e86d7cc5f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:47:57.364649Z","signature_b64":"ojqpvH/I2rW/ri+jLC4KLC01KA5OhVPoL65XInQx/C3XUX7CcxwSFHmyD1zSoxIBPBzTRJP3oGNOTZS+vJdFAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8fc852483fb225d778696e74bbc19db430df0629d74d87b1cbdae11e86d7cc5f","last_reissued_at":"2026-05-18T01:47:57.363929Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:47:57.363929Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1308.6215","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":"2026-05-18T01:47:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0WgkcmKFAfmU5XxXRkyVUZ//lQvI1Ybvb27ANPx5qYNgzrxs7viVIrICn7I5J42o+f8RNOT+VM89tGKzZy0NDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:13:03.312444Z"},"content_sha256":"4fd85d89b8d1c35afdd88d914ec05d7ebfaedea216e6609827f6f1912b760e04","schema_version":"1.0","event_id":"sha256:4fd85d89b8d1c35afdd88d914ec05d7ebfaedea216e6609827f6f1912b760e04"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:R7EFESB7WIS5O6DJNZ2LXQM5WQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"High-n Hydrogen Recombination Lines from the First Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Abraham Loeb, Evan Rule, Vladimir Strelnitski","submitted_at":"2013-08-28T16:52:33Z","abstract_excerpt":"We investigate the prospects of blind and targeted searches in the radio domain (10 MHz to 1 THz) for high-n hydrogen recombination lines from the first generation of galaxies, at z < 10. The expected optically thin spontaneous alpha-line luminosities are calculated as a function of the absolute AB magnitude of a galaxy at 1500 angstrom. For a blind search, semi-empirical luminosity functions are used to calculate the number of galaxies whose expected flux densities exceed an assumed detectability threshold. Plots of the minimum sky area, within which at least one detectable galaxy is expected"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.6215","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":"2026-05-18T01:47:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X0ev53qwcxF4sXgcSFtZhXmWGmOwCyUKWMooGsGRWGBIkWLo4O1Z4eRrtcDe7Y8BYwXOhUtZ91tAKjNfIgFRAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:13:03.312804Z"},"content_sha256":"8ec5cfb72a874101672ace5ea97e60ef09b71c5aab311d82c2bd92ff7b4ea21f","schema_version":"1.0","event_id":"sha256:8ec5cfb72a874101672ace5ea97e60ef09b71c5aab311d82c2bd92ff7b4ea21f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R7EFESB7WIS5O6DJNZ2LXQM5WQ/bundle.json","state_url":"https://pith.science/pith/R7EFESB7WIS5O6DJNZ2LXQM5WQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R7EFESB7WIS5O6DJNZ2LXQM5WQ/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":"2026-05-30T11:13:03Z","links":{"resolver":"https://pith.science/pith/R7EFESB7WIS5O6DJNZ2LXQM5WQ","bundle":"https://pith.science/pith/R7EFESB7WIS5O6DJNZ2LXQM5WQ/bundle.json","state":"https://pith.science/pith/R7EFESB7WIS5O6DJNZ2LXQM5WQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R7EFESB7WIS5O6DJNZ2LXQM5WQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:R7EFESB7WIS5O6DJNZ2LXQM5WQ","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":"ce019828a3948cc73f5e94349c09f3508bb57568ff6890dbbb877112eaef2102","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-28T16:52:33Z","title_canon_sha256":"8c1199b4c8a9f102682a6a17a06ddfd6f4190269cfd97182e38bd1b5ce3450e9"},"schema_version":"1.0","source":{"id":"1308.6215","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.6215","created_at":"2026-05-18T01:47:57Z"},{"alias_kind":"arxiv_version","alias_value":"1308.6215v1","created_at":"2026-05-18T01:47:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.6215","created_at":"2026-05-18T01:47:57Z"},{"alias_kind":"pith_short_12","alias_value":"R7EFESB7WIS5","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_16","alias_value":"R7EFESB7WIS5O6DJ","created_at":"2026-05-18T12:27:57Z"},{"alias_kind":"pith_short_8","alias_value":"R7EFESB7","created_at":"2026-05-18T12:27:57Z"}],"graph_snapshots":[{"event_id":"sha256:8ec5cfb72a874101672ace5ea97e60ef09b71c5aab311d82c2bd92ff7b4ea21f","target":"graph","created_at":"2026-05-18T01:47:57Z","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 investigate the prospects of blind and targeted searches in the radio domain (10 MHz to 1 THz) for high-n hydrogen recombination lines from the first generation of galaxies, at z < 10. The expected optically thin spontaneous alpha-line luminosities are calculated as a function of the absolute AB magnitude of a galaxy at 1500 angstrom. For a blind search, semi-empirical luminosity functions are used to calculate the number of galaxies whose expected flux densities exceed an assumed detectability threshold. Plots of the minimum sky area, within which at least one detectable galaxy is expected","authors_text":"Abraham Loeb, Evan Rule, Vladimir Strelnitski","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-28T16:52:33Z","title":"High-n Hydrogen Recombination Lines from the First Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.6215","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":"sha256:4fd85d89b8d1c35afdd88d914ec05d7ebfaedea216e6609827f6f1912b760e04","target":"record","created_at":"2026-05-18T01:47:57Z","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":"ce019828a3948cc73f5e94349c09f3508bb57568ff6890dbbb877112eaef2102","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-28T16:52:33Z","title_canon_sha256":"8c1199b4c8a9f102682a6a17a06ddfd6f4190269cfd97182e38bd1b5ce3450e9"},"schema_version":"1.0","source":{"id":"1308.6215","kind":"arxiv","version":1}},"canonical_sha256":"8fc852483fb225d778696e74bbc19db430df0629d74d87b1cbdae11e86d7cc5f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8fc852483fb225d778696e74bbc19db430df0629d74d87b1cbdae11e86d7cc5f","first_computed_at":"2026-05-18T01:47:57.363929Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:47:57.363929Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ojqpvH/I2rW/ri+jLC4KLC01KA5OhVPoL65XInQx/C3XUX7CcxwSFHmyD1zSoxIBPBzTRJP3oGNOTZS+vJdFAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:47:57.364649Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.6215","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4fd85d89b8d1c35afdd88d914ec05d7ebfaedea216e6609827f6f1912b760e04","sha256:8ec5cfb72a874101672ace5ea97e60ef09b71c5aab311d82c2bd92ff7b4ea21f"],"state_sha256":"76c39aa1f54d35f4e576b55511b478b511af2bdc01e7a8752f1847b957802b10"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ROpPsBKypN9J/QiJFG8bilAlSSsO7EB/hpTc6oePPmSa0pG4wZ5XCoRW4ijOGtgAWtom3f6JehneAJCq1muyDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T11:13:03.314834Z","bundle_sha256":"b1383eed6ebd57715dfed5139cbd2b610466a1035902dfd4595a53298217db02"}}