{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:PBIRUX4YMZITGDHXO3BXTECQ4A","short_pith_number":"pith:PBIRUX4Y","canonical_record":{"source":{"id":"1008.2957","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-17T20:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"f6d2ecc9cbb3c2bf598f650e01294834dd041853c97f5876d57e2e0cf743b0bc","abstract_canon_sha256":"9b2c29155d0ec5fbbc72711b800454cf55e44e45bbad0618b492774de95e6e19"},"schema_version":"1.0"},"canonical_sha256":"78511a5f986651330cf776c3799050e01a664f3b4f123d2bec3cef7022977b9e","source":{"kind":"arxiv","id":"1008.2957","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.2957","created_at":"2026-05-18T04:42:03Z"},{"alias_kind":"arxiv_version","alias_value":"1008.2957v1","created_at":"2026-05-18T04:42:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.2957","created_at":"2026-05-18T04:42:03Z"},{"alias_kind":"pith_short_12","alias_value":"PBIRUX4YMZIT","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"PBIRUX4YMZITGDHX","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"PBIRUX4Y","created_at":"2026-05-18T12:26:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:PBIRUX4YMZITGDHXO3BXTECQ4A","target":"record","payload":{"canonical_record":{"source":{"id":"1008.2957","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-17T20:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"f6d2ecc9cbb3c2bf598f650e01294834dd041853c97f5876d57e2e0cf743b0bc","abstract_canon_sha256":"9b2c29155d0ec5fbbc72711b800454cf55e44e45bbad0618b492774de95e6e19"},"schema_version":"1.0"},"canonical_sha256":"78511a5f986651330cf776c3799050e01a664f3b4f123d2bec3cef7022977b9e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:42:03.794529Z","signature_b64":"hAL66Z7CEZQQc1xWq245o4s6LkBVoypGL0YhRYpzd7gfGuDVAImb4mPcVrfLXeHjvBewKqYnivo/ZhhgRL7cAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"78511a5f986651330cf776c3799050e01a664f3b4f123d2bec3cef7022977b9e","last_reissued_at":"2026-05-18T04:42:03.794099Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:42:03.794099Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1008.2957","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":"2026-05-18T04:42:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gmf0Uc29wncprDdSRpf5SlPkNLo0DI6vh8yyVZi/6SrAhdfHtASNQyf2KcT/WtZOfbht5nGrSp3AH6hZB3RHAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T15:26:27.154326Z"},"content_sha256":"e8b9831fe655059fe46f0193742bea00922c494c30c457a463e0d68b4eb32529","schema_version":"1.0","event_id":"sha256:e8b9831fe655059fe46f0193742bea00922c494c30c457a463e0d68b4eb32529"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:PBIRUX4YMZITGDHXO3BXTECQ4A","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hubble/COS Observations of the Quasar HE 2347-4342: Probing the Epoch of He II Patchy Reionization at Redshifts z = 2.4-2.9","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Britton Smith, Charles Danforth, Jason Tumlinson, Kevin France, Michael Shull","submitted_at":"2010-08-17T20:00:01Z","abstract_excerpt":"We report ultraviolet spectra of the high-redshift (z_em = 2.9) quasar, HE 2347-4342, taken by the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST). Spectra in the G130M (medium-resolution, 1135-1440 A) and G140L (low-resolution, 1030-2000 A) gratings exhibit patchy Gunn-Peterson absorption in the 303.78 A (Ly-alpha) line of He II between z = 2.39-2.87 (G140L) and z = 2.74-2.90 (G130M). With COS, we obtain better spectral resolution, higher-S/N, and better determined backgrounds than previous studies, with sensitivity to abundance fractions x_HeII = 0.01 in filaments of th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.2957","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":"2026-05-18T04:42:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rCwS0Pzj2nAiRjRyB1pKrhcHkPg6CZiRY02VdtlqIwyOPxtJxq2Bn65y+KkLsxPjTUIeITmwa7qTe2zhVhrFAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T15:26:27.154947Z"},"content_sha256":"8a6260cfcb8032b9085205a5c15e3037bc8dd2e538d11e26fe3e66bccfbb14e1","schema_version":"1.0","event_id":"sha256:8a6260cfcb8032b9085205a5c15e3037bc8dd2e538d11e26fe3e66bccfbb14e1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PBIRUX4YMZITGDHXO3BXTECQ4A/bundle.json","state_url":"https://pith.science/pith/PBIRUX4YMZITGDHXO3BXTECQ4A/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PBIRUX4YMZITGDHXO3BXTECQ4A/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":"2026-06-06T15:26:27Z","links":{"resolver":"https://pith.science/pith/PBIRUX4YMZITGDHXO3BXTECQ4A","bundle":"https://pith.science/pith/PBIRUX4YMZITGDHXO3BXTECQ4A/bundle.json","state":"https://pith.science/pith/PBIRUX4YMZITGDHXO3BXTECQ4A/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PBIRUX4YMZITGDHXO3BXTECQ4A/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:PBIRUX4YMZITGDHXO3BXTECQ4A","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":"9b2c29155d0ec5fbbc72711b800454cf55e44e45bbad0618b492774de95e6e19","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-17T20:00:01Z","title_canon_sha256":"f6d2ecc9cbb3c2bf598f650e01294834dd041853c97f5876d57e2e0cf743b0bc"},"schema_version":"1.0","source":{"id":"1008.2957","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.2957","created_at":"2026-05-18T04:42:03Z"},{"alias_kind":"arxiv_version","alias_value":"1008.2957v1","created_at":"2026-05-18T04:42:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.2957","created_at":"2026-05-18T04:42:03Z"},{"alias_kind":"pith_short_12","alias_value":"PBIRUX4YMZIT","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"PBIRUX4YMZITGDHX","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"PBIRUX4Y","created_at":"2026-05-18T12:26:12Z"}],"graph_snapshots":[{"event_id":"sha256:8a6260cfcb8032b9085205a5c15e3037bc8dd2e538d11e26fe3e66bccfbb14e1","target":"graph","created_at":"2026-05-18T04:42:03Z","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 report ultraviolet spectra of the high-redshift (z_em = 2.9) quasar, HE 2347-4342, taken by the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST). Spectra in the G130M (medium-resolution, 1135-1440 A) and G140L (low-resolution, 1030-2000 A) gratings exhibit patchy Gunn-Peterson absorption in the 303.78 A (Ly-alpha) line of He II between z = 2.39-2.87 (G140L) and z = 2.74-2.90 (G130M). With COS, we obtain better spectral resolution, higher-S/N, and better determined backgrounds than previous studies, with sensitivity to abundance fractions x_HeII = 0.01 in filaments of th","authors_text":"Britton Smith, Charles Danforth, Jason Tumlinson, Kevin France, Michael Shull","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-17T20:00:01Z","title":"Hubble/COS Observations of the Quasar HE 2347-4342: Probing the Epoch of He II Patchy Reionization at Redshifts z = 2.4-2.9"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.2957","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:e8b9831fe655059fe46f0193742bea00922c494c30c457a463e0d68b4eb32529","target":"record","created_at":"2026-05-18T04:42:03Z","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":"9b2c29155d0ec5fbbc72711b800454cf55e44e45bbad0618b492774de95e6e19","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-17T20:00:01Z","title_canon_sha256":"f6d2ecc9cbb3c2bf598f650e01294834dd041853c97f5876d57e2e0cf743b0bc"},"schema_version":"1.0","source":{"id":"1008.2957","kind":"arxiv","version":1}},"canonical_sha256":"78511a5f986651330cf776c3799050e01a664f3b4f123d2bec3cef7022977b9e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"78511a5f986651330cf776c3799050e01a664f3b4f123d2bec3cef7022977b9e","first_computed_at":"2026-05-18T04:42:03.794099Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:42:03.794099Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hAL66Z7CEZQQc1xWq245o4s6LkBVoypGL0YhRYpzd7gfGuDVAImb4mPcVrfLXeHjvBewKqYnivo/ZhhgRL7cAw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:42:03.794529Z","signed_message":"canonical_sha256_bytes"},"source_id":"1008.2957","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e8b9831fe655059fe46f0193742bea00922c494c30c457a463e0d68b4eb32529","sha256:8a6260cfcb8032b9085205a5c15e3037bc8dd2e538d11e26fe3e66bccfbb14e1"],"state_sha256":"3223deedbc35e8a00c05cf2b4ef33362bd99140f5bc4dd5e121825dc9deab1f9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GcDr+7i7SIDB+NIVC0M5iAa7jYTC/244uCfmu5hB30rBlz231245p2iKrikAFL0nX+bJykhbjnaLzhKobI5bBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T15:26:27.158076Z","bundle_sha256":"5ebbedd77ed57f5988e312bb59b602fb3e3be6e85f1037af6d3e8741c9e46ccd"}}