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We use the Green Bank Telescope (GBT) to measure $\\sim$15 Hn$\\alpha$ recombination transitions simultaneously and average these data to improve our spectral signal-to-noise ratio. We show that our data can be used to estimate the total ionizing photon flux of these two sources, and we derive their SFRs within the GBT beam: $\\Psi_{\\rm OB} = 3.46$ M$_{\\odot}$ yr$^{-1}$ for M51 and $\\Psi_{\\rm OB} = 0.56$ M$_{\\odot}$ yr$^{-"},"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":"1805.11460","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-05-29T13:41:05Z","cross_cats_sorted":[],"title_canon_sha256":"8cf6a7824725ccb06ca846643034d89da57577ad81112acd6fc3519826115c94","abstract_canon_sha256":"674531a9f72b2309cb13617199f9fd8df425fcc628ef9cb324b41e04bbf13a33"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:11:04.699586Z","signature_b64":"3BSbnAbO0vCyE/fXHbet+Axrjrufrl2QKHA6lz7zMeMHUnQrLmvd8DxF5YXHTHsO5snVobla69qfggFzvfhCAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"682c66936fe0692e9a14ec2856930a69f720c95bbef216ab10fb111ef5b9646d","last_reissued_at":"2026-05-18T00:11:04.698933Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:11:04.698933Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Hydrogen Radio Recombination Line Emission from M51 and NGC628","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Amanda A. 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