Cluster Ages to Reconstruct the Milky Way Assembly (CARMA)
Journal
Date Issued
2023
Author(s)
•
Fernando Aguado-Agelet
•
•
•
•
Sara Saracino
•
Carme Gallart
•
Tomás Ruiz-Lara
•
Emma Fernández-Alvar
•
Francisco Surot
•
Amalie Stokholm
•
Maurizio Salaris
•
•
Abstract
We present CARMA, the Cluster Ages to Reconstruct the Milky Way Assembly
project, that aims at determining precise and accurate age measurements for the
entire system of known Galactic globular clusters and at using them to trace
the most significant merger events experienced by the Milky Way. The strength
of CARMA relies on the use of homogeneous photometry, theoretical isochrones,
and statistical methods, that will enable to define a systematic-free
chronological scale for the complete sample of Milky Way globulars. In this
paper we describe the CARMA framework in detail, and present a first
application on a sample of six metal-rich globular clusters with the aim of
putting the final word on the debated origin of NGC6388 and NGC6441. Our
results demonstrate that this pair of clusters is coeval with other four
systems having a clear in-situ origin. Moreover, their location in the
age-metallicity plane matches the one occupied by in-situ field stars. Such an
accurate age comparison enabled by the CARMA methodology rules out the
possibility that NGC6388 and NGC6441 have been accreted as part of a past
merger event.
Volume
680
Start page
A20
Issn Identifier
0004-6361
Rights
open.access
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