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Gerin","submitted_at":"2018-07-06T00:51:44Z","abstract_excerpt":"%context More gas is inferred to be present in molecular cloud complexes than can be accounted for by HI and CO emission, a phenomenon known as dark neutral medium (DNM) or CO-dark gas for the molecules. %aims To see if molecular gas can be detected in Chamaeleon when gas column densities in the DNM were inferred and CO emission was not detected. % methods We took 3mm absorption profiles of HCO+ and other molecules toward quasars across Chamaeleon, 1 of which had detectable CO emission. We derived N(H2) assuming N(HC+)/N(H2) = 3x10^{-9}. %results With the possible exception of 1 weak continuum"},"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":"1807.02210","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-06T00:51:44Z","cross_cats_sorted":[],"title_canon_sha256":"e17d1e359558e17730b23a453defed11f31ddd233c81106562e2b7107bf212c3","abstract_canon_sha256":"0f6d1c699afebd02a6ad48db25572032ed300428ea4829e8d2913cf8b2a13cee"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:05:30.502106Z","signature_b64":"oBRBTG2swXDDkXZpNCm/CVq9YkEScn2l6ETFte6Og9aI7jIGSODAy3OXA3SZk8VNieOvFmn9YycTlJQmdDZzAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"30494191e59bc0f6f0f7934de1416acaae27d4bdd08292ec1d6c23f5f58fa3a4","last_reissued_at":"2026-05-18T00:05:30.501688Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:05:30.501688Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Molecular Gas and Dark Neutral Medium in the Outskirts 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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