{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:7X44WS3CVPX72PQWEJG3LZB7DB","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":"d278638d8553a2f0b410f7f89f588bbbd4ed293643aa18ea5d9d6ca5e914e127","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-07T21:17:31Z","title_canon_sha256":"95666e74fbe6f25b7172849c5ced2f975b287ca01f3ccbb3d702ec7b8bdb29bd"},"schema_version":"1.0","source":{"id":"1603.02300","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.02300","created_at":"2026-05-18T01:07:20Z"},{"alias_kind":"arxiv_version","alias_value":"1603.02300v3","created_at":"2026-05-18T01:07:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.02300","created_at":"2026-05-18T01:07:20Z"},{"alias_kind":"pith_short_12","alias_value":"7X44WS3CVPX7","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_16","alias_value":"7X44WS3CVPX72PQW","created_at":"2026-05-18T12:30:04Z"},{"alias_kind":"pith_short_8","alias_value":"7X44WS3C","created_at":"2026-05-18T12:30:04Z"}],"graph_snapshots":[{"event_id":"sha256:39c6c6f7fb0cbdbbca6d88b59ea8fba67c5c6061d85a6f87cdda3c2ddf518709","target":"graph","created_at":"2026-05-18T01:07:20Z","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 analytic theory for the total column density of singly ionized carbon (C+) in the optically thick photon dominated regions (PDRs) of far-UV irradiated (star-forming) molecular clouds. We derive a simple formula for the C+ column as a function of the cloud (hydrogen) density, the far-UV field intensity, and metallicity, encompassing the wide range of galaxy conditions. When assuming the typical relation between UV and density in the cold neutral medium, the C+ column becomes a function of the metallicity alone. We verify our analysis with detailed numerical PDR models. For optically ","authors_text":"Amiel Sternberg, Raanan Nordon","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-07T21:17:31Z","title":"C+/H2 Gas in Star-Forming Clouds and Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.02300","kind":"arxiv","version":3},"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:fe9d9550334291230720161ca4ca29f3539a843cc94862a12a823da89f6cd98e","target":"record","created_at":"2026-05-18T01:07:20Z","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":"d278638d8553a2f0b410f7f89f588bbbd4ed293643aa18ea5d9d6ca5e914e127","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-07T21:17:31Z","title_canon_sha256":"95666e74fbe6f25b7172849c5ced2f975b287ca01f3ccbb3d702ec7b8bdb29bd"},"schema_version":"1.0","source":{"id":"1603.02300","kind":"arxiv","version":3}},"canonical_sha256":"fdf9cb4b62abeffd3e16224db5e43f1851bcfc74b3db5c9afd5f66bf4c50a264","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fdf9cb4b62abeffd3e16224db5e43f1851bcfc74b3db5c9afd5f66bf4c50a264","first_computed_at":"2026-05-18T01:07:20.841250Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:07:20.841250Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mXS1f9FX4097EFI/Dtyfnus2udCwU+uJ4I+4l7fsjsvsUb+CLiRMpIRSOksN3aqN/OoxdqD+a0EANp1QAPnECg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:07:20.841730Z","signed_message":"canonical_sha256_bytes"},"source_id":"1603.02300","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fe9d9550334291230720161ca4ca29f3539a843cc94862a12a823da89f6cd98e","sha256:39c6c6f7fb0cbdbbca6d88b59ea8fba67c5c6061d85a6f87cdda3c2ddf518709"],"state_sha256":"8bcabb51b8d0dedb0c65fe4b0d76e857d9675df11ba5245962009af64611dc79"}