The End of the White Dwarf Cooling Sequence in M4: an efficient approach
L. R. Bedin (1), M. Salaris (2), G. Piotto (3), J. Anderson (1), I. R., King (4), S. Cassisi (5) ((1) STScI, (2) J.M.Univ.Liverpool, (3) Univ.PD, (4), Univ.of Washington Seattle, (5) INAF-Obs.Teramo)
TL;DR
This study uses deep ACS observations to identify the end of the white dwarf cooling sequence in M4, providing an age estimate consistent with main sequence turn-off measurements, demonstrating an efficient observational approach.
Contribution
It presents an efficient method to determine the white dwarf cooling sequence end and cluster age using deep photometry and completeness analysis.
Findings
End of white dwarf cooling sequence at magnitude m_F606W = 28.5
Cluster age estimated at 11.6 Gyr from white dwarf data
Results consistent with main sequence turn-off age of 12.0 Gyr
Abstract
We use 14 orbits of ACS 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 turn-off (12.0+/-1.4 Gyr).
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