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Gerin","submitted_at":"2019-05-14T02:58:24Z","abstract_excerpt":"% context We had detected J=1-0 HCO+ absorption in 12 directions lacking detected CO emission in the outskirts of the Chamaeleon complex and on 1 sightline with integrated CO emission 2.4 K-\\kms. 8 sightlines had a much larger mean column density of dark neutral medium (DNM)-gas not represented in H I or CO emission-and were found to have much higher mean molecular column density. The 5 other sightlines had little or no DNM and were found to have much smaller but still detectable N(HCO+). % aims To determine N(CO) along previously-observed Chamaeleon sightlines and to determine why CO emission"},"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":"1905.05369","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-05-14T02:58:24Z","cross_cats_sorted":[],"title_canon_sha256":"06472625f45c3d61039f636fdc4b313384e74bc7436248bec9aa18867079f993","abstract_canon_sha256":"7f450ca91014e75fa30b592cc0e79428660113f8f94815edba16dca0b200cc97"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:41:08.646878Z","signature_b64":"rllqydlrB1vJ7yq9WL39GGN7v7NaQRauCk0u7eW+GjjoFc6M85kP1LRuaq3hqnauIyvSqiNgbhgv9JYGqferDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0cabc447fed4c290e41e726b1d214464436aac2bea2035c9ea7acc8aca6938f7","last_reissued_at":"2026-05-17T23:41:08.646252Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:41:08.646252Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Standing in the shadow of dark gas: ALMA observations of absorption from dark CO in the molecular DNM of Chamaeleon","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"H. 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