{"paper":{"title":"The White Dwarf Cooling Sequence of the Globular Cluster Messier 4","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Brad K. Gibson (Swinburne Univ.), Brad M. S. Hansen (UCLA/Princeton), Greg G. Fahlman (CFHT), Harvey B. Richer (UBC), James Brewer (UBC), Marco Limongi (Oss. Roma), Michael M. Shara (AMNH), Peter B. Stetson (HIA/NRC), R. Michael Rich (UCLA), Rodrigo Ibata (Obs. Strasbourg)","submitted_at":"2002-05-06T20:00:19Z","abstract_excerpt":"We present the white dwarf sequence of the globular cluster M4, based on a 123 orbit Hubble Space Telescope exposure, with limiting magnitude V = 30, I = 28. The white dwarf luminosity function rises sharply for I >25.5, consistent with the behaviour expected for a burst population. The white dwarfs of M4 extend to approximately 2.5 magnitudes fainter than the peak of the local Galactic disk white dwarf luminosity function. This demonstrates a clear and significant age difference between the Galactic disk and the halo globular cluster M4. Using the same standard white dwarf models (Hansen 1999"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0205087","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"}