{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:BERR3BFGG6URLCVE37UYIBJA5I","short_pith_number":"pith:BERR3BFG","schema_version":"1.0","canonical_sha256":"09231d84a637a9158aa4dfe9840520ea2cf0fcd1e003dd27590efa63c2591bce","source":{"kind":"arxiv","id":"1911.03856","version":3},"attestation_state":"computed","paper":{"title":"The hydroxyl satellite-line `flip' as a tracer of expanding HII regions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Anita Petzler, Joanne R Dawson, Mark Wardle","submitted_at":"2019-11-10T05:24:32Z","abstract_excerpt":"Observations of the four $^{2}\\Pi_{3/2},~J = 3/2$~ground state transitions of the hydroxyl radical (OH) have emerged as an informative tracer of molecular gas in the Galactic ISM. We discuss an OH spectral feature known as the `flip', in which the satellite lines at 1612 and 1720\\,MHz flip -- one from emission to absorption and the other the reverse -- across a closely blended double feature. We highlight 30 examples of the flip from the literature, 27 of which exhibit the same orientation with respect to velocity: the 1720\\,MHz line is seen in emission at more negative velocities. These same "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1911.03856","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-11-10T05:24:32Z","cross_cats_sorted":[],"title_canon_sha256":"f56a925a4f207bf8b6c0a618cd321f858a125de1fc1a1ecf69aa2d51914be886","abstract_canon_sha256":"7d19fbcdfce979c3a3584ce40f1f97fc27f3a6aae72bde46ee09de4c7a4b4c97"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:26:06.773636Z","signature_b64":"vPWkSB9rc0lxLoKAypHqrYt74BzLixJr2fhmdfdIHGuI/+vTBqn3/mx3+7YHwLttSnkTk2DdBDSV3jLNXMSeBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"09231d84a637a9158aa4dfe9840520ea2cf0fcd1e003dd27590efa63c2591bce","last_reissued_at":"2026-07-05T01:26:06.773174Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:26:06.773174Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The hydroxyl satellite-line `flip' as a tracer of expanding HII regions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Anita Petzler, Joanne R Dawson, Mark Wardle","submitted_at":"2019-11-10T05:24:32Z","abstract_excerpt":"Observations of the four $^{2}\\Pi_{3/2},~J = 3/2$~ground state transitions of the hydroxyl radical (OH) have emerged as an informative tracer of molecular gas in the Galactic ISM. We discuss an OH spectral feature known as the `flip', in which the satellite lines at 1612 and 1720\\,MHz flip -- one from emission to absorption and the other the reverse -- across a closely blended double feature. We highlight 30 examples of the flip from the literature, 27 of which exhibit the same orientation with respect to velocity: the 1720\\,MHz line is seen in emission at more negative velocities. These same "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1911.03856","kind":"arxiv","version":3},"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/1911.03856/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1911.03856","created_at":"2026-07-05T01:26:06.773230+00:00"},{"alias_kind":"arxiv_version","alias_value":"1911.03856v3","created_at":"2026-07-05T01:26:06.773230+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1911.03856","created_at":"2026-07-05T01:26:06.773230+00:00"},{"alias_kind":"pith_short_12","alias_value":"BERR3BFGG6UR","created_at":"2026-07-05T01:26:06.773230+00:00"},{"alias_kind":"pith_short_16","alias_value":"BERR3BFGG6URLCVE","created_at":"2026-07-05T01:26:06.773230+00:00"},{"alias_kind":"pith_short_8","alias_value":"BERR3BFG","created_at":"2026-07-05T01:26:06.773230+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/BERR3BFGG6URLCVE37UYIBJA5I","json":"https://pith.science/pith/BERR3BFGG6URLCVE37UYIBJA5I.json","graph_json":"https://pith.science/api/pith-number/BERR3BFGG6URLCVE37UYIBJA5I/graph.json","events_json":"https://pith.science/api/pith-number/BERR3BFGG6URLCVE37UYIBJA5I/events.json","paper":"https://pith.science/paper/BERR3BFG"},"agent_actions":{"view_html":"https://pith.science/pith/BERR3BFGG6URLCVE37UYIBJA5I","download_json":"https://pith.science/pith/BERR3BFGG6URLCVE37UYIBJA5I.json","view_paper":"https://pith.science/paper/BERR3BFG","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1911.03856&json=true","fetch_graph":"https://pith.science/api/pith-number/BERR3BFGG6URLCVE37UYIBJA5I/graph.json","fetch_events":"https://pith.science/api/pith-number/BERR3BFGG6URLCVE37UYIBJA5I/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/BERR3BFGG6URLCVE37UYIBJA5I/action/timestamp_anchor","attest_storage":"https://pith.science/pith/BERR3BFGG6URLCVE37UYIBJA5I/action/storage_attestation","attest_author":"https://pith.science/pith/BERR3BFGG6URLCVE37UYIBJA5I/action/author_attestation","sign_citation":"https://pith.science/pith/BERR3BFGG6URLCVE37UYIBJA5I/action/citation_signature","submit_replication":"https://pith.science/pith/BERR3BFGG6URLCVE37UYIBJA5I/action/replication_record"}},"created_at":"2026-07-05T01:26:06.773230+00:00","updated_at":"2026-07-05T01:26:06.773230+00:00"}