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We analyze H$_2$O 557 GHz line profiles observed with HIFI toward four positions in two infrared-dark cloud clumps . By comparison with ground-based C$^{17}$O, N$_2$H$^+$, CH$_3$OH and NH$_3$ line observations, we constrain the volume density and kinetic temperature of the gas and estimate the column density and abundance of H$_2$O and N$_2$H$^+$.\n  Results. The observed water lines are "},"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":"1408.1515","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2014-08-07T08:54:49Z","cross_cats_sorted":[],"title_canon_sha256":"a6206b17530b6871c6ebfa84ee9dff4223455f187ec10060e9ae476d06e809a3","abstract_canon_sha256":"f7837a07efd644a7445104fc2aa9cce5fdeb33cd83fe3892e922646109ee6ef1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:40:09.994649Z","signature_b64":"/3e7B4xhYJ3rpBTZzY7hdngOrW8CqzGeKwdp9F7M4DKih8x/c4efCD8SFrAzW1ddBmkkM3fZqGevzIJLMnzxBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fd8b1ea05c771701ab9fa627f2a0123bbbe889a9f1e32bd5026d7a4e1b62bea4","last_reissued_at":"2026-05-18T02:40:09.994225Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:40:09.994225Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The physical conditions in IRDC clumps from Herschel HIFI observations of H2O","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Fabrice Herpin, Floris F.S van der Tak, Friedrich Wyrowski, Russell F. Shipman, Wilfred Frieswijk","submitted_at":"2014-08-07T08:54:49Z","abstract_excerpt":"Context. The earliest phases of high-mass star formation are poorly understood.\n  Aims. Our goal is to determine the physical conditions and kinematic structure of massive star-forming cloud clumps.\n  Methods. We analyze H$_2$O 557 GHz line profiles observed with HIFI toward four positions in two infrared-dark cloud clumps . By comparison with ground-based C$^{17}$O, N$_2$H$^+$, CH$_3$OH and NH$_3$ line observations, we constrain the volume density and kinetic temperature of the gas and estimate the column density and abundance of H$_2$O and N$_2$H$^+$.\n  Results. The observed water lines are "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.1515","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":""},"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":"1408.1515","created_at":"2026-05-18T02:40:09.994290+00:00"},{"alias_kind":"arxiv_version","alias_value":"1408.1515v2","created_at":"2026-05-18T02:40:09.994290+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.1515","created_at":"2026-05-18T02:40:09.994290+00:00"},{"alias_kind":"pith_short_12","alias_value":"7WFR5IC4O4LQ","created_at":"2026-05-18T12:28:19.803747+00:00"},{"alias_kind":"pith_short_16","alias_value":"7WFR5IC4O4LQDK47","created_at":"2026-05-18T12:28:19.803747+00:00"},{"alias_kind":"pith_short_8","alias_value":"7WFR5IC4","created_at":"2026-05-18T12:28:19.803747+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/7WFR5IC4O4LQDK47UYT7FIASHO","json":"https://pith.science/pith/7WFR5IC4O4LQDK47UYT7FIASHO.json","graph_json":"https://pith.science/api/pith-number/7WFR5IC4O4LQDK47UYT7FIASHO/graph.json","events_json":"https://pith.science/api/pith-number/7WFR5IC4O4LQDK47UYT7FIASHO/events.json","paper":"https://pith.science/paper/7WFR5IC4"},"agent_actions":{"view_html":"https://pith.science/pith/7WFR5IC4O4LQDK47UYT7FIASHO","download_json":"https://pith.science/pith/7WFR5IC4O4LQDK47UYT7FIASHO.json","view_paper":"https://pith.science/paper/7WFR5IC4","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1408.1515&json=true","fetch_graph":"https://pith.science/api/pith-number/7WFR5IC4O4LQDK47UYT7FIASHO/graph.json","fetch_events":"https://pith.science/api/pith-number/7WFR5IC4O4LQDK47UYT7FIASHO/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/7WFR5IC4O4LQDK47UYT7FIASHO/action/timestamp_anchor","attest_storage":"https://pith.science/pith/7WFR5IC4O4LQDK47UYT7FIASHO/action/storage_attestation","attest_author":"https://pith.science/pith/7WFR5IC4O4LQDK47UYT7FIASHO/action/author_attestation","sign_citation":"https://pith.science/pith/7WFR5IC4O4LQDK47UYT7FIASHO/action/citation_signature","submit_replication":"https://pith.science/pith/7WFR5IC4O4LQDK47UYT7FIASHO/action/replication_record"}},"created_at":"2026-05-18T02:40:09.994290+00:00","updated_at":"2026-05-18T02:40:09.994290+00:00"}