Stellar populations in the transition region of nuclear star cluster and nuclear stellar disc

ABSTRACT The Milky Way nuclear star cluster (NSC) is located within the stellar disc (NSD) in Galactic Centre. It not fully understood if formation and evolution of these two components are connected, how they influence each other. We study populations transition region NSC NSD. observed ?4.3 pc2 fields with integral-field spectrograph KMOS (VLT), at r ? 20 pc (>4 Re) to East West NSC. extract analyse medium-resolution spectra >200 stars per field. data contain total nine young candidates. use photometry estimate masses, effective temperatures, spectral types stars. consistent an age 4–6 Myr, may have formed inside Quintuplet cluster, but were dispersed dynamical interactions. Most red giant stars, we measure their metallicities [M/H] using full fitting. compare our distributions NSD, from literature, find that overall metallicity decreases central NSC, over region, steep decrease dominated by NSD indicates distinct histories.