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Bedin, Luigi R; Salaris, Maurizio; Piotto, Giampaolo; Anderson, Jay; King, Ivan R; Cassisi, Santi
The Astrophysical journal, 06/2009, Letnik: 697, Številka: 2Journal Article
We use 14 orbits of Advanced Camera for Surveys observations to reach the end of the white dwarf cooling sequence in the globular cluster M4. Our photometry and completeness tests show that the end is located at magnitude m F606W = 28.5 - 0.1, which implies an age of 11.6 - 0.6 Gyr (internal errors only). This is consistent with the age from fits to the main-sequence turnoff (12.0 - 1.4 Gyr).
