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Our study detects high-velocity (HV) HI clouds (above 83 km/s) which coincide with W51B, but finds that the clouds are behind W51B. Both W51C and G49.2-0.35 have have similar highest-velocity absorption features at ~70 km/s. The HII region G49.1-0.38 is behind the SNR because its HI absorption spectrum has"},"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":"1305.0325","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-05-02T02:06:40Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"d85407179d079c1d3dff6524f5a7a11359ddab4ea269d4c6a609083b9c78a898","abstract_canon_sha256":"4ef307851f77da6c2b74bdb36b538b5ad93655dca22624379ebaeec0d2519318"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:50:13.416342Z","signature_b64":"gtLmga2FtsRf1CjclfsTjxMWxgips1nQwEbyzMKhAQf3zKoGLAd721E8m/t9NNXCG4le9mq0sjonc83FDUudAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bac67b6fd5277936e513189f8df070c40fa28a56a2265020e4afb5c1a45b8833","last_reissued_at":"2026-05-18T01:50:13.415709Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:50:13.415709Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"High velocity HI is not associated with TeV supernova remnant W51C","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"D.A. Leahy, W.W. Tian","submitted_at":"2013-05-02T02:06:40Z","abstract_excerpt":"The recently-detected TeV gamma-ray source HESS J1923+141 coincides with Supernova Remnant (SNR) W51C and the star forming region W51B of the W51 complex. We construct HI absorption spectra to SNR W51C, HII regions G49.2-0.35 and G49.1-0.38 in W51B, and a nearby compact extragalactic source. Our study detects high-velocity (HV) HI clouds (above 83 km/s) which coincide with W51B, but finds that the clouds are behind W51B. Both W51C and G49.2-0.35 have have similar highest-velocity absorption features at ~70 km/s. 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