{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:FQQRLWAHHCHXNJKKZGHHOVDZAR","short_pith_number":"pith:FQQRLWAH","canonical_record":{"source":{"id":"1907.02067","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-03T18:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"9778842ed68761ed240b408fd276bbafb5fec87daa95db3a28ad092ce6d52f60","abstract_canon_sha256":"759303846e492b9e2e8bb7f69d049e0bd9553a75eef4ea338076f556cdb82c9d"},"schema_version":"1.0"},"canonical_sha256":"2c2115d807388f76a54ac98e775479047f55a7db71581193de69989b59bd3ebf","source":{"kind":"arxiv","id":"1907.02067","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.02067","created_at":"2026-05-17T23:41:07Z"},{"alias_kind":"arxiv_version","alias_value":"1907.02067v1","created_at":"2026-05-17T23:41:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.02067","created_at":"2026-05-17T23:41:07Z"},{"alias_kind":"pith_short_12","alias_value":"FQQRLWAHHCHX","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"FQQRLWAHHCHXNJKK","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"FQQRLWAH","created_at":"2026-05-18T12:33:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:FQQRLWAHHCHXNJKKZGHHOVDZAR","target":"record","payload":{"canonical_record":{"source":{"id":"1907.02067","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-03T18:00:00Z","cross_cats_sorted":[],"title_canon_sha256":"9778842ed68761ed240b408fd276bbafb5fec87daa95db3a28ad092ce6d52f60","abstract_canon_sha256":"759303846e492b9e2e8bb7f69d049e0bd9553a75eef4ea338076f556cdb82c9d"},"schema_version":"1.0"},"canonical_sha256":"2c2115d807388f76a54ac98e775479047f55a7db71581193de69989b59bd3ebf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:41:07.046568Z","signature_b64":"tmiXwyvEk0+jv+0LfvjYpqP2aqoTNA2F77QPDRwM4c/o1wEPujxzNpgikjMPgS9PNt6bciX6qE5WO+IOQNtkDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c2115d807388f76a54ac98e775479047f55a7db71581193de69989b59bd3ebf","last_reissued_at":"2026-05-17T23:41:07.045974Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:41:07.045974Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.02067","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":"2026-05-17T23:41:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9Mm9zLXBMl71xOz/PeRTtYY3U/cYgagC4CB9/c78QXC2sSlpJHIS0sRslzUk32f+mx+fgARXZDBx3IwGaCBOBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T10:43:16.061539Z"},"content_sha256":"18526ed088db4bbe5f6159c9d037da7aeeed973cc2680876c0e432dea0b3c41b","schema_version":"1.0","event_id":"sha256:18526ed088db4bbe5f6159c9d037da7aeeed973cc2680876c0e432dea0b3c41b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:FQQRLWAHHCHXNJKKZGHHOVDZAR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Radiation hydrodynamics simulations of the evolution of the diffuse ionized gas in disc galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Bert Vandenbroucke, Kenneth Wood","submitted_at":"2019-07-03T18:00:00Z","abstract_excerpt":"There is strong evidence that the diffuse ionized gas (DIG) in disc galaxies is photoionized by radiation from UV luminous O and B stars in the galactic disc, both from observations and detailed numerical models. However, it is still not clear what mechanism is responsible for providing the necessary pressure support for a diffuse gas layer at kpc-scale above the disc. In this work we investigate if the pressure increase caused by photoionization can provide this support. We run self-consistent radiation hydrodynamics models of a gaseous disc in an external potential. We find that photoionizat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.02067","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":"2026-05-17T23:41:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rtxROLvIE/Gw6lv1NlbDhTyAMzotu0dzgpwzqn4ObhMB6B99W187xusNeMYhbOsTQ5OyhXUE6qqJILmZuResCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T10:43:16.062228Z"},"content_sha256":"b4a87f9ecc0f240d3253abb14ac66e544d76c8607a8a632e7067c9cf6e0d5963","schema_version":"1.0","event_id":"sha256:b4a87f9ecc0f240d3253abb14ac66e544d76c8607a8a632e7067c9cf6e0d5963"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FQQRLWAHHCHXNJKKZGHHOVDZAR/bundle.json","state_url":"https://pith.science/pith/FQQRLWAHHCHXNJKKZGHHOVDZAR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FQQRLWAHHCHXNJKKZGHHOVDZAR/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":"2026-05-26T10:43:16Z","links":{"resolver":"https://pith.science/pith/FQQRLWAHHCHXNJKKZGHHOVDZAR","bundle":"https://pith.science/pith/FQQRLWAHHCHXNJKKZGHHOVDZAR/bundle.json","state":"https://pith.science/pith/FQQRLWAHHCHXNJKKZGHHOVDZAR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FQQRLWAHHCHXNJKKZGHHOVDZAR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:FQQRLWAHHCHXNJKKZGHHOVDZAR","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":"759303846e492b9e2e8bb7f69d049e0bd9553a75eef4ea338076f556cdb82c9d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-03T18:00:00Z","title_canon_sha256":"9778842ed68761ed240b408fd276bbafb5fec87daa95db3a28ad092ce6d52f60"},"schema_version":"1.0","source":{"id":"1907.02067","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.02067","created_at":"2026-05-17T23:41:07Z"},{"alias_kind":"arxiv_version","alias_value":"1907.02067v1","created_at":"2026-05-17T23:41:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.02067","created_at":"2026-05-17T23:41:07Z"},{"alias_kind":"pith_short_12","alias_value":"FQQRLWAHHCHX","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"FQQRLWAHHCHXNJKK","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"FQQRLWAH","created_at":"2026-05-18T12:33:15Z"}],"graph_snapshots":[{"event_id":"sha256:b4a87f9ecc0f240d3253abb14ac66e544d76c8607a8a632e7067c9cf6e0d5963","target":"graph","created_at":"2026-05-17T23:41:07Z","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":"There is strong evidence that the diffuse ionized gas (DIG) in disc galaxies is photoionized by radiation from UV luminous O and B stars in the galactic disc, both from observations and detailed numerical models. However, it is still not clear what mechanism is responsible for providing the necessary pressure support for a diffuse gas layer at kpc-scale above the disc. In this work we investigate if the pressure increase caused by photoionization can provide this support. We run self-consistent radiation hydrodynamics models of a gaseous disc in an external potential. We find that photoionizat","authors_text":"Bert Vandenbroucke, Kenneth Wood","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-03T18:00:00Z","title":"Radiation hydrodynamics simulations of the evolution of the diffuse ionized gas in disc galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.02067","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":"sha256:18526ed088db4bbe5f6159c9d037da7aeeed973cc2680876c0e432dea0b3c41b","target":"record","created_at":"2026-05-17T23:41:07Z","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":"759303846e492b9e2e8bb7f69d049e0bd9553a75eef4ea338076f556cdb82c9d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-03T18:00:00Z","title_canon_sha256":"9778842ed68761ed240b408fd276bbafb5fec87daa95db3a28ad092ce6d52f60"},"schema_version":"1.0","source":{"id":"1907.02067","kind":"arxiv","version":1}},"canonical_sha256":"2c2115d807388f76a54ac98e775479047f55a7db71581193de69989b59bd3ebf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2c2115d807388f76a54ac98e775479047f55a7db71581193de69989b59bd3ebf","first_computed_at":"2026-05-17T23:41:07.045974Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:41:07.045974Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tmiXwyvEk0+jv+0LfvjYpqP2aqoTNA2F77QPDRwM4c/o1wEPujxzNpgikjMPgS9PNt6bciX6qE5WO+IOQNtkDA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:41:07.046568Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.02067","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:18526ed088db4bbe5f6159c9d037da7aeeed973cc2680876c0e432dea0b3c41b","sha256:b4a87f9ecc0f240d3253abb14ac66e544d76c8607a8a632e7067c9cf6e0d5963"],"state_sha256":"6715365ff8cb7e3b8fb008daee25f723c71a905d2d7ef706f42528ab298300eb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m9HGfDqQB3pvt2AI9rzu96j4zA5N464QR7Y3/R3om3ofbpCht/PK6Rx/xp/bh/+oxkuy8qtI39Mc7w/elsvrBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T10:43:16.066182Z","bundle_sha256":"b9667de18b08d2f63b2221a7842034ff4b9555a48a1d9e0d067f777cee20a53c"}}