{"paper":{"title":"The efficiency per free-fall time as a ratio of the Star Formation Rate to the gas-infall rate in collapsing cores: dependence on the core definition, accretion, and radial structure","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Aina Palau, Enrique V\\'azquez-Semadeni, Fabi\\'an Quesada-Z\\'u\\~niga, Gilberto C. G\\'omez, Javier Ballesteros-Paredes, Manuel Zamora-Avil\\'es","submitted_at":"2026-06-20T04:40:52Z","abstract_excerpt":"A parameter used to characterise star formation activity in MCs is the efficiency per free-fall time, $\\epsilon_{\\rm ff}$, although commonly referred to as an efficiency, it is formally the ratio between the star formation rate (SFR) and the gas-infall rate. Here we numerically study the collapse of cores and define $\\epsilon_{\\rm ff}\\equiv\\langle\\dot{M}_\\star\\rangle/(M_{\\rm core}/\\tau_{\\rm ff})$, where $\\langle\\dot{M}_\\star\\rangle$ is the average SFR, $M_{\\rm core}$ is the gas mass within the core (as the gas cells above a density threshold), and $\\tau_{\\rm ff}$ is the free-fall time of the c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.21878","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.21878/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}