No anomalous energy loss is seen in the red-giant tips of 27 globular clusters, yielding g_ae < 3.8e-14 at 95% confidence, the strongest bound for axion-electron coupling below about 1 keV.
Origin of the system of globular clusters in the Milky Way -- Gaia eDR3 edition
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abstract
In this research note I update the associations between globular clusters and their putative galaxy progenitors determined in Massari et al. (2019), based on the kinematic measurements from the Gaia early data release 3 (eDR3, Gaia Collaboration et al. 2021). The table with the associations is available at https://www.oas.inaf.it/en/research/m2-en/carma-en/, and will be kept up-to-date whenever improved data become available. The same table will also provide updated age estimates from the CARMA project (see Massari et al. 2023). Please cite this Note alongside Massari, Koppelman & Helmi 2019, eDR3 edition.
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Isochrone fitting of Galactic globular clusters - IX. Tip of the red-giant branch for 27 clusters and constraints on new particle physics
No anomalous energy loss is seen in the red-giant tips of 27 globular clusters, yielding g_ae < 3.8e-14 at 95% confidence, the strongest bound for axion-electron coupling below about 1 keV.