{"paper":{"title":"The Onset of Thermally Unstable Cooling from the Hot Atmospheres of Giant Galaxies in Clusters - Constraints on Feedback Models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. C. Edge, A. N. Vantyghem, B. R. McNamara, F. Pulido, H. R. Russell, Iu. Babyk, M. McDonald, M. T. Hogan (University of Waterloo, P. E. J. Nulsen, Perimeter Institute), R. A. Main","submitted_at":"2017-03-31T18:00:05Z","abstract_excerpt":"We present accurate mass and thermodynamic profiles for a sample of 56 galaxy clusters observed with the Chandra X-ray Observatory. We investigate the effects of local gravitational acceleration in central cluster galaxies, and we explore the role of the local free-fall time (t$_{\\rm ff}$) in thermally unstable cooling. We find that the local cooling time (t$_{\\rm cool}$) is as effective an indicator of cold gas, traced through its nebular emission, as the ratio of t$_{\\rm cool}$/t$_{\\rm ff}$. Therefore, t$_{\\rm cool}$ alone apparently governs the onset of thermally unstable cooling in hot atm"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1704.00011","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"}