{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:OPKASH5PMNTQDCFNQVMJ5TM2VP","short_pith_number":"pith:OPKASH5P","canonical_record":{"source":{"id":"1008.4132","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-24T20:00:05Z","cross_cats_sorted":[],"title_canon_sha256":"37d6de4427f9e2899935881358ffcab8940206521a36c816d806a614c9f62c87","abstract_canon_sha256":"040f86f88916d5589d384338fc15e530c299af8da13d88b4566ea2f66cccd616"},"schema_version":"1.0"},"canonical_sha256":"73d4091faf63670188ad85589ecd9aabc68698c0bb63410273674402d7049806","source":{"kind":"arxiv","id":"1008.4132","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.4132","created_at":"2026-05-18T02:05:43Z"},{"alias_kind":"arxiv_version","alias_value":"1008.4132v1","created_at":"2026-05-18T02:05:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.4132","created_at":"2026-05-18T02:05:43Z"},{"alias_kind":"pith_short_12","alias_value":"OPKASH5PMNTQ","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"OPKASH5PMNTQDCFN","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"OPKASH5P","created_at":"2026-05-18T12:26:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:OPKASH5PMNTQDCFNQVMJ5TM2VP","target":"record","payload":{"canonical_record":{"source":{"id":"1008.4132","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-24T20:00:05Z","cross_cats_sorted":[],"title_canon_sha256":"37d6de4427f9e2899935881358ffcab8940206521a36c816d806a614c9f62c87","abstract_canon_sha256":"040f86f88916d5589d384338fc15e530c299af8da13d88b4566ea2f66cccd616"},"schema_version":"1.0"},"canonical_sha256":"73d4091faf63670188ad85589ecd9aabc68698c0bb63410273674402d7049806","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:43.119854Z","signature_b64":"bBkXzELmLnQMpVQvk7i2X0zW416UfZ85S11H3HSoaTkqllap2/lCJNidEArC0m1wSnV9URIMoKiHaP3LvfleAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"73d4091faf63670188ad85589ecd9aabc68698c0bb63410273674402d7049806","last_reissued_at":"2026-05-18T02:05:43.119225Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:43.119225Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1008.4132","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":"2026-05-18T02:05:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YyhjBTkCcvQny9b1y84gI/Mo+6QpKNFatW3VXZebrt0Pi2uzY1MgpBxQUR3St2rUuN9bgL24AYymk80NFJ/XCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T15:41:59.873101Z"},"content_sha256":"b78ad2bfbff8af9e30e384aa44d00d419391af5e91100494017995d0d352be13","schema_version":"1.0","event_id":"sha256:b78ad2bfbff8af9e30e384aa44d00d419391af5e91100494017995d0d352be13"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:OPKASH5PMNTQDCFNQVMJ5TM2VP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Revisiting the He II to H I ratio in the Intergalactic Medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Paris), Patrick Petitjean (IAP, Pune), Raghunathan Srianand (IUCAA, Sowgat Muzahid (IUCAA","submitted_at":"2010-08-24T20:00:05Z","abstract_excerpt":"We estimate the He II to H I column density ratio, \\eta = N(He II)/N(H I), in the intergalactic medium towards the high redshift (z_{em} = 2.885) bright quasar QSO HE 2347-4342 using Voigt-profile fitting of the H I transitions in the Lyman series and the He II Lyman-$\\alpha$ transition as observed by the FUSE satellite. In agreement with previous studies, we find that $\\eta > 50$ in most of the Lyman-$\\alpha$ forest except in four regions where it is much smaller ($\\eta \\sim 10-20$) and therefore inconsistent with photo-ionization by the UV background flux. We detect O VI and C IV absorption "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.4132","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":"2026-05-18T02:05:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dhDunFyM7oYAPvzJYvLYHuItWt3JfCFXwjwjd22msQNAaarxcYbRTfoPCXYIKsCI58g/+uLU6PtC/6b+tIy3CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T15:41:59.873773Z"},"content_sha256":"6aa878e20374bff1fe6f66c1fc4ee17b16311b36443f1d6422d0a5d49a4869e5","schema_version":"1.0","event_id":"sha256:6aa878e20374bff1fe6f66c1fc4ee17b16311b36443f1d6422d0a5d49a4869e5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OPKASH5PMNTQDCFNQVMJ5TM2VP/bundle.json","state_url":"https://pith.science/pith/OPKASH5PMNTQDCFNQVMJ5TM2VP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OPKASH5PMNTQDCFNQVMJ5TM2VP/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":"2026-05-25T15:41:59Z","links":{"resolver":"https://pith.science/pith/OPKASH5PMNTQDCFNQVMJ5TM2VP","bundle":"https://pith.science/pith/OPKASH5PMNTQDCFNQVMJ5TM2VP/bundle.json","state":"https://pith.science/pith/OPKASH5PMNTQDCFNQVMJ5TM2VP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OPKASH5PMNTQDCFNQVMJ5TM2VP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:OPKASH5PMNTQDCFNQVMJ5TM2VP","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":"040f86f88916d5589d384338fc15e530c299af8da13d88b4566ea2f66cccd616","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-24T20:00:05Z","title_canon_sha256":"37d6de4427f9e2899935881358ffcab8940206521a36c816d806a614c9f62c87"},"schema_version":"1.0","source":{"id":"1008.4132","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.4132","created_at":"2026-05-18T02:05:43Z"},{"alias_kind":"arxiv_version","alias_value":"1008.4132v1","created_at":"2026-05-18T02:05:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.4132","created_at":"2026-05-18T02:05:43Z"},{"alias_kind":"pith_short_12","alias_value":"OPKASH5PMNTQ","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"OPKASH5PMNTQDCFN","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"OPKASH5P","created_at":"2026-05-18T12:26:12Z"}],"graph_snapshots":[{"event_id":"sha256:6aa878e20374bff1fe6f66c1fc4ee17b16311b36443f1d6422d0a5d49a4869e5","target":"graph","created_at":"2026-05-18T02:05:43Z","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 estimate the He II to H I column density ratio, \\eta = N(He II)/N(H I), in the intergalactic medium towards the high redshift (z_{em} = 2.885) bright quasar QSO HE 2347-4342 using Voigt-profile fitting of the H I transitions in the Lyman series and the He II Lyman-$\\alpha$ transition as observed by the FUSE satellite. In agreement with previous studies, we find that $\\eta > 50$ in most of the Lyman-$\\alpha$ forest except in four regions where it is much smaller ($\\eta \\sim 10-20$) and therefore inconsistent with photo-ionization by the UV background flux. We detect O VI and C IV absorption ","authors_text":"Paris), Patrick Petitjean (IAP, Pune), Raghunathan Srianand (IUCAA, Sowgat Muzahid (IUCAA","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-24T20:00:05Z","title":"Revisiting the He II to H I ratio in the Intergalactic Medium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.4132","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:b78ad2bfbff8af9e30e384aa44d00d419391af5e91100494017995d0d352be13","target":"record","created_at":"2026-05-18T02:05:43Z","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":"040f86f88916d5589d384338fc15e530c299af8da13d88b4566ea2f66cccd616","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-08-24T20:00:05Z","title_canon_sha256":"37d6de4427f9e2899935881358ffcab8940206521a36c816d806a614c9f62c87"},"schema_version":"1.0","source":{"id":"1008.4132","kind":"arxiv","version":1}},"canonical_sha256":"73d4091faf63670188ad85589ecd9aabc68698c0bb63410273674402d7049806","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"73d4091faf63670188ad85589ecd9aabc68698c0bb63410273674402d7049806","first_computed_at":"2026-05-18T02:05:43.119225Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:43.119225Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bBkXzELmLnQMpVQvk7i2X0zW416UfZ85S11H3HSoaTkqllap2/lCJNidEArC0m1wSnV9URIMoKiHaP3LvfleAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:43.119854Z","signed_message":"canonical_sha256_bytes"},"source_id":"1008.4132","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b78ad2bfbff8af9e30e384aa44d00d419391af5e91100494017995d0d352be13","sha256:6aa878e20374bff1fe6f66c1fc4ee17b16311b36443f1d6422d0a5d49a4869e5"],"state_sha256":"a33f1ce511006913a2ba02c111a79120e23ab8622d10aab94eda92d56dcce5bc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zuftovQ05T0xKYyrNQGdyeHOOyTNZQIoWnwRbWHcntkvLMT6VaKKacZTQpd9nd0sTCTHwXUDu+dDlgs6XLi9Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T15:41:59.877244Z","bundle_sha256":"a4a5a879172dfe237d8d745cc157511c4769a0045c088d4425c93c757917732a"}}