{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:VGXDBN2GF2AJHMQBRGBAFS2HHW","short_pith_number":"pith:VGXDBN2G","canonical_record":{"source":{"id":"1808.07271","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-22T08:29:29Z","cross_cats_sorted":[],"title_canon_sha256":"dc5af0ce5bc7a90dedd37498368a108ffeae836cba56a746c3078361c263c501","abstract_canon_sha256":"0136e5071cc734688c035212c89c2077eb2fd2abbac775caf50fdcbb9159c201"},"schema_version":"1.0"},"canonical_sha256":"a9ae30b7462e8093b201898202cb473d9e12cbf6909e3ef6afca153531c8fc3f","source":{"kind":"arxiv","id":"1808.07271","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.07271","created_at":"2026-07-05T04:18:59Z"},{"alias_kind":"arxiv_version","alias_value":"1808.07271v2","created_at":"2026-07-05T04:18:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.07271","created_at":"2026-07-05T04:18:59Z"},{"alias_kind":"pith_short_12","alias_value":"VGXDBN2GF2AJ","created_at":"2026-07-05T04:18:59Z"},{"alias_kind":"pith_short_16","alias_value":"VGXDBN2GF2AJHMQB","created_at":"2026-07-05T04:18:59Z"},{"alias_kind":"pith_short_8","alias_value":"VGXDBN2G","created_at":"2026-07-05T04:18:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:VGXDBN2GF2AJHMQBRGBAFS2HHW","target":"record","payload":{"canonical_record":{"source":{"id":"1808.07271","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-22T08:29:29Z","cross_cats_sorted":[],"title_canon_sha256":"dc5af0ce5bc7a90dedd37498368a108ffeae836cba56a746c3078361c263c501","abstract_canon_sha256":"0136e5071cc734688c035212c89c2077eb2fd2abbac775caf50fdcbb9159c201"},"schema_version":"1.0"},"canonical_sha256":"a9ae30b7462e8093b201898202cb473d9e12cbf6909e3ef6afca153531c8fc3f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:18:59.494009Z","signature_b64":"ZskYvWrnjnuffZ/wSXYWyG1TheOc0JD5YBtDdgZEQYECW68UPWqydhFLLuqbCvvAPWRcJ8YBPQKMi+DUPAkQAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a9ae30b7462e8093b201898202cb473d9e12cbf6909e3ef6afca153531c8fc3f","last_reissued_at":"2026-07-05T04:18:59.493590Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:18:59.493590Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.07271","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":"2026-07-05T04:18:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hdi+K5JkRecFVPJVPlIjUqqp4vXaYczwUJG1keh4ozO2rXgLJU3YgiccKp4owAQecdftjLG1fbK1gsAvFegyDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T11:41:31.573346Z"},"content_sha256":"bd0d464c3a0c2761cd2815d75635f92d743c66611439f5a300ac733d1515c1e8","schema_version":"1.0","event_id":"sha256:bd0d464c3a0c2761cd2815d75635f92d743c66611439f5a300ac733d1515c1e8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:VGXDBN2GF2AJHMQBRGBAFS2HHW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The character of the warm ionised medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Marisa Geyer, Mark Walker","submitted_at":"2018-08-22T08:29:29Z","abstract_excerpt":"$\\textit{Herschel}$ observations of far infrared N$^+$ emission lines have demonstrated that dense plasma, with $n_e\\sim30\\,{\\rm cm^{-3}}$, is ubiquitous in the inner Galactic plane. By combining the information from $\\textit{Herschel}$ with other tracers of ionised gas, we build a picture of this dense plasma. We adopt a collisional ionisation model, so the analysis is not tied to a specific energisation mechanism. We find that the dense plasma is concentrated in a disk that is $130\\;{\\rm pc}$ thick, and makes a significant contribution to radio pulsar dispersion measures in the inner Galacti"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.07271","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1808.07271/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T04:18:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rTQ+/8aJeRLHUDqkzAMHD4A/2IgkxqkOmCmLaMcuGtNi9KSyYPKViVLEJ94Th3IoR9K+6UBVrqs0c3YB5Nd7AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T11:41:31.573749Z"},"content_sha256":"68673f3fc6db0f12477d401c8a402186ec66d56c6a553c80f9ff33ef6c2bc1f6","schema_version":"1.0","event_id":"sha256:68673f3fc6db0f12477d401c8a402186ec66d56c6a553c80f9ff33ef6c2bc1f6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VGXDBN2GF2AJHMQBRGBAFS2HHW/bundle.json","state_url":"https://pith.science/pith/VGXDBN2GF2AJHMQBRGBAFS2HHW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VGXDBN2GF2AJHMQBRGBAFS2HHW/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":"2026-08-06T11:41:31Z","links":{"resolver":"https://pith.science/pith/VGXDBN2GF2AJHMQBRGBAFS2HHW","bundle":"https://pith.science/pith/VGXDBN2GF2AJHMQBRGBAFS2HHW/bundle.json","state":"https://pith.science/pith/VGXDBN2GF2AJHMQBRGBAFS2HHW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VGXDBN2GF2AJHMQBRGBAFS2HHW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:VGXDBN2GF2AJHMQBRGBAFS2HHW","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":"0136e5071cc734688c035212c89c2077eb2fd2abbac775caf50fdcbb9159c201","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-22T08:29:29Z","title_canon_sha256":"dc5af0ce5bc7a90dedd37498368a108ffeae836cba56a746c3078361c263c501"},"schema_version":"1.0","source":{"id":"1808.07271","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.07271","created_at":"2026-07-05T04:18:59Z"},{"alias_kind":"arxiv_version","alias_value":"1808.07271v2","created_at":"2026-07-05T04:18:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.07271","created_at":"2026-07-05T04:18:59Z"},{"alias_kind":"pith_short_12","alias_value":"VGXDBN2GF2AJ","created_at":"2026-07-05T04:18:59Z"},{"alias_kind":"pith_short_16","alias_value":"VGXDBN2GF2AJHMQB","created_at":"2026-07-05T04:18:59Z"},{"alias_kind":"pith_short_8","alias_value":"VGXDBN2G","created_at":"2026-07-05T04:18:59Z"}],"graph_snapshots":[{"event_id":"sha256:68673f3fc6db0f12477d401c8a402186ec66d56c6a553c80f9ff33ef6c2bc1f6","target":"graph","created_at":"2026-07-05T04:18:59Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1808.07271/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"$\\textit{Herschel}$ observations of far infrared N$^+$ emission lines have demonstrated that dense plasma, with $n_e\\sim30\\,{\\rm cm^{-3}}$, is ubiquitous in the inner Galactic plane. By combining the information from $\\textit{Herschel}$ with other tracers of ionised gas, we build a picture of this dense plasma. We adopt a collisional ionisation model, so the analysis is not tied to a specific energisation mechanism. We find that the dense plasma is concentrated in a disk that is $130\\;{\\rm pc}$ thick, and makes a significant contribution to radio pulsar dispersion measures in the inner Galacti","authors_text":"Marisa Geyer, Mark Walker","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-22T08:29:29Z","title":"The character of the warm ionised medium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.07271","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:bd0d464c3a0c2761cd2815d75635f92d743c66611439f5a300ac733d1515c1e8","target":"record","created_at":"2026-07-05T04:18:59Z","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":"0136e5071cc734688c035212c89c2077eb2fd2abbac775caf50fdcbb9159c201","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-08-22T08:29:29Z","title_canon_sha256":"dc5af0ce5bc7a90dedd37498368a108ffeae836cba56a746c3078361c263c501"},"schema_version":"1.0","source":{"id":"1808.07271","kind":"arxiv","version":2}},"canonical_sha256":"a9ae30b7462e8093b201898202cb473d9e12cbf6909e3ef6afca153531c8fc3f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a9ae30b7462e8093b201898202cb473d9e12cbf6909e3ef6afca153531c8fc3f","first_computed_at":"2026-07-05T04:18:59.493590Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:18:59.493590Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZskYvWrnjnuffZ/wSXYWyG1TheOc0JD5YBtDdgZEQYECW68UPWqydhFLLuqbCvvAPWRcJ8YBPQKMi+DUPAkQAw==","signature_status":"signed_v1","signed_at":"2026-07-05T04:18:59.494009Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.07271","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bd0d464c3a0c2761cd2815d75635f92d743c66611439f5a300ac733d1515c1e8","sha256:68673f3fc6db0f12477d401c8a402186ec66d56c6a553c80f9ff33ef6c2bc1f6"],"state_sha256":"89a8b7c0e303af2b3e9ff4959da9c4e38451bc0e6a0ca57139c30ce549e7a2ee"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iyMFB/jc7GfmbZP5BgPDw5G1sE/O2rLdHFblvn3T7ilguZj53N957SwABaEToiS6CR49HVJq4dgLDYeEVFZzAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T11:41:31.577592Z","bundle_sha256":"eb58f5e35b2cacda8c7578352fee116ce945c9e921d2d5b45432baddea0f2caa"}}