A genuine Large Magellanic Cloud age gap star cluster

ANDRES E. PIATTI

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2022

0035-8711

We confirm the existence of a second Large Magellanic Cloud (LMC) star cluster, KMHK~1592, with an age that falls in the middle of the so-called LMC star cluster age gap, a longperiod of time ($\sim$ 4 - 11 Gyr) where no star cluster had been uncovered, except ESO\,121-SC\,03.The age (8.0$\pm$0.5 Gyr) and the metallicity ([Fe/H]=-1.0$\pm$0.2 dex) of KMHK~1592 were derived from the fit of theoretical isochrones to theintrinsic star cluster colour-magnitude diagram sequences, which were unveiled using a robust star-by-star membership probability procedure. Because of the relative low brightness of the star cluster, deep GEMINI GMOS images were used. We discuss the pros and cons of three glimpsed scenarios that could explain the presence of both LMC age gap star clusters in the outskirts of the LMC, namely: in-situ star cluster formation, capture from the Small Magellanic Cloud, or accretion of a small dwarf galaxy.