{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:DCUZJJQV4V7VODO4VWPFAAR2KO","short_pith_number":"pith:DCUZJJQV","canonical_record":{"source":{"id":"1203.0517","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-03-02T16:33:21Z","cross_cats_sorted":[],"title_canon_sha256":"dbb72f6e05ae0fe559a671e511efab1ad7a3e2b78e126ccc1e46dd2fac0bc5ac","abstract_canon_sha256":"e6d3a23113a150ffafb8868503e54dd9e1146ad9723a1b15ca1f0cf3577334e9"},"schema_version":"1.0"},"canonical_sha256":"18a994a615e57f570ddcad9e50023a53a551c89e19199e79dd70e1edc791358b","source":{"kind":"arxiv","id":"1203.0517","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.0517","created_at":"2026-05-18T01:58:15Z"},{"alias_kind":"arxiv_version","alias_value":"1203.0517v2","created_at":"2026-05-18T01:58:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.0517","created_at":"2026-05-18T01:58:15Z"},{"alias_kind":"pith_short_12","alias_value":"DCUZJJQV4V7V","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"DCUZJJQV4V7VODO4","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"DCUZJJQV","created_at":"2026-05-18T12:27:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:DCUZJJQV4V7VODO4VWPFAAR2KO","target":"record","payload":{"canonical_record":{"source":{"id":"1203.0517","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-03-02T16:33:21Z","cross_cats_sorted":[],"title_canon_sha256":"dbb72f6e05ae0fe559a671e511efab1ad7a3e2b78e126ccc1e46dd2fac0bc5ac","abstract_canon_sha256":"e6d3a23113a150ffafb8868503e54dd9e1146ad9723a1b15ca1f0cf3577334e9"},"schema_version":"1.0"},"canonical_sha256":"18a994a615e57f570ddcad9e50023a53a551c89e19199e79dd70e1edc791358b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:58:15.562821Z","signature_b64":"9/9O3Yte2o6ukd5jFhhecEMvnce/01ygLPve8MFrXj2v5EVcaBs3R8A1x9qwuyWiQBMIqd6RYLg+M3b30NnrDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"18a994a615e57f570ddcad9e50023a53a551c89e19199e79dd70e1edc791358b","last_reissued_at":"2026-05-18T01:58:15.562132Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:58:15.562132Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1203.0517","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:58:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ykz9bHpS8HyJishpAER6HA6LCFTjPbHbPm46RBy4uINTLf/pMXql6xIFJKxcB2usbktn7MZZgnwjAJ2i3vnNDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T06:16:57.371255Z"},"content_sha256":"f57dfb1f61bd0cb85c077beed9cee1083a244eaaa8cac52ebf2b8a6af9791394","schema_version":"1.0","event_id":"sha256:f57dfb1f61bd0cb85c077beed9cee1083a244eaaa8cac52ebf2b8a6af9791394"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:DCUZJJQV4V7VODO4VWPFAAR2KO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Prospects of observing a quasar HII region during the Epoch of Reionization with redshifted 21cm","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Garrelt Mellema, Ilian T. Iliev, Kanan K. Datta, Martina M. Friedrich, Paul R. Shapiro","submitted_at":"2012-03-02T16:33:21Z","abstract_excerpt":"We present a study of the impact of a bright quasar on the redshifted 21cm signal during the Epoch of Reionization (EoR). Using three different cosmological radiative transfer simulations, we investigate if quasars are capable of substantially changing the size and morphology of the H II regions they are born in. We choose stellar and quasar luminosities in a way that is favourable to seeing such an effect. We find that even the most luminous of our quasar models is not able to increase the size of its native H II region substantially beyond those of large H II regions produced by clustered st"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.0517","kind":"arxiv","version":2},"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":"2026-05-18T01:58:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YPcVao6QIlk7DSW1yjnLOXbCPRLj+EJMEmVZhWlVZUOHt9ubziT+zuxNphu7AXlCbploWzg+A4/57daj5lkGCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T06:16:57.371715Z"},"content_sha256":"b78f66550db63d64db51ac1717c1d2f5826bb1dcd28245a274e83f1c110f4d6c","schema_version":"1.0","event_id":"sha256:b78f66550db63d64db51ac1717c1d2f5826bb1dcd28245a274e83f1c110f4d6c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DCUZJJQV4V7VODO4VWPFAAR2KO/bundle.json","state_url":"https://pith.science/pith/DCUZJJQV4V7VODO4VWPFAAR2KO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DCUZJJQV4V7VODO4VWPFAAR2KO/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":"2026-05-31T06:16:57Z","links":{"resolver":"https://pith.science/pith/DCUZJJQV4V7VODO4VWPFAAR2KO","bundle":"https://pith.science/pith/DCUZJJQV4V7VODO4VWPFAAR2KO/bundle.json","state":"https://pith.science/pith/DCUZJJQV4V7VODO4VWPFAAR2KO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DCUZJJQV4V7VODO4VWPFAAR2KO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:DCUZJJQV4V7VODO4VWPFAAR2KO","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":"e6d3a23113a150ffafb8868503e54dd9e1146ad9723a1b15ca1f0cf3577334e9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-03-02T16:33:21Z","title_canon_sha256":"dbb72f6e05ae0fe559a671e511efab1ad7a3e2b78e126ccc1e46dd2fac0bc5ac"},"schema_version":"1.0","source":{"id":"1203.0517","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.0517","created_at":"2026-05-18T01:58:15Z"},{"alias_kind":"arxiv_version","alias_value":"1203.0517v2","created_at":"2026-05-18T01:58:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.0517","created_at":"2026-05-18T01:58:15Z"},{"alias_kind":"pith_short_12","alias_value":"DCUZJJQV4V7V","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"DCUZJJQV4V7VODO4","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"DCUZJJQV","created_at":"2026-05-18T12:27:01Z"}],"graph_snapshots":[{"event_id":"sha256:b78f66550db63d64db51ac1717c1d2f5826bb1dcd28245a274e83f1c110f4d6c","target":"graph","created_at":"2026-05-18T01:58:15Z","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"},"paper":{"abstract_excerpt":"We present a study of the impact of a bright quasar on the redshifted 21cm signal during the Epoch of Reionization (EoR). Using three different cosmological radiative transfer simulations, we investigate if quasars are capable of substantially changing the size and morphology of the H II regions they are born in. We choose stellar and quasar luminosities in a way that is favourable to seeing such an effect. We find that even the most luminous of our quasar models is not able to increase the size of its native H II region substantially beyond those of large H II regions produced by clustered st","authors_text":"Garrelt Mellema, Ilian T. Iliev, Kanan K. Datta, Martina M. Friedrich, Paul R. Shapiro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-03-02T16:33:21Z","title":"Prospects of observing a quasar HII region during the Epoch of Reionization with redshifted 21cm"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.0517","kind":"arxiv","version":2},"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:f57dfb1f61bd0cb85c077beed9cee1083a244eaaa8cac52ebf2b8a6af9791394","target":"record","created_at":"2026-05-18T01:58:15Z","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":"e6d3a23113a150ffafb8868503e54dd9e1146ad9723a1b15ca1f0cf3577334e9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-03-02T16:33:21Z","title_canon_sha256":"dbb72f6e05ae0fe559a671e511efab1ad7a3e2b78e126ccc1e46dd2fac0bc5ac"},"schema_version":"1.0","source":{"id":"1203.0517","kind":"arxiv","version":2}},"canonical_sha256":"18a994a615e57f570ddcad9e50023a53a551c89e19199e79dd70e1edc791358b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"18a994a615e57f570ddcad9e50023a53a551c89e19199e79dd70e1edc791358b","first_computed_at":"2026-05-18T01:58:15.562132Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:58:15.562132Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9/9O3Yte2o6ukd5jFhhecEMvnce/01ygLPve8MFrXj2v5EVcaBs3R8A1x9qwuyWiQBMIqd6RYLg+M3b30NnrDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:58:15.562821Z","signed_message":"canonical_sha256_bytes"},"source_id":"1203.0517","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f57dfb1f61bd0cb85c077beed9cee1083a244eaaa8cac52ebf2b8a6af9791394","sha256:b78f66550db63d64db51ac1717c1d2f5826bb1dcd28245a274e83f1c110f4d6c"],"state_sha256":"dc3c4b26c673e857999fd8cc591dfe4bd9251ae9c18d1cbd68d566549651afb4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sG1OkLNFwcWasnUtHPRogjI/Tj/4PMnZX/sj5M2OzJ87zdvZjAKa8GGdTjiIB2dW7gH93b5T8SVHZ6nBrP0jDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T06:16:57.375404Z","bundle_sha256":"5b240847dbe0750ab56b5be532e08a2e6f2368df81a96c55a00b55401bc51124"}}