{"paper":{"title":"ALMA observations of 99 GHz free-free and H40$\\alpha$ line emission from star formation in the centre of NGC 253","license":"http://creativecommons.org/licenses/by/3.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"C. Dickinson, G. A. Fuller, G. J. Bendo, M. J. D'Cruze, R. J. Beswick, T. W. B. Muxlow","submitted_at":"2015-04-08T22:03:00Z","abstract_excerpt":"We present Atacama Large Millimeter/submillimeter Array observations of 99.02 GHz free-free and H40$\\alpha$ emission from the centre of the nearby starburst galaxy NGC 253. We calculate electron temperatures of 3700-4500 K for the photoionized gas, which agrees with previous measurements. We measure a photoionizing photon production rate of $(3.2\\pm0.2)\\times10^{53}$ s$^{-1}$ and a star formation rate of $1.73\\pm0.12$ M$_\\odot$ yr$^{-1}$ within the central 20$\\times$10 arcsec, which fall within the broad range of measurements from previous millimetre and radio observations but which are better"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.02142","kind":"arxiv","version":1},"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"}