Young massive star clusters
Simon Portegies Zwart (Sterrewacht Leiden), Steve McMillan (Drexel, University), Mark Gieles (ESO)

TL;DR
Young massive star clusters are dense, young stellar groups that serve as key sites for studying stellar evolution, dynamics, and exotic objects, with recent advances in observations and modeling enhancing our understanding of their properties and formation.
Contribution
This review synthesizes current knowledge on young massive star clusters, highlighting their properties, formation, and the latest observational and dynamical modeling techniques.
Findings
Known young massive clusters in the Local Group and beyond are characterized.
Observational and dynamical modeling techniques are advancing understanding.
Young massive clusters are potential nurseries for exotic stellar objects.
Abstract
Young massive clusters are dense aggregates of young stars that form the fundamental building blocks of galaxies. Several examples exist in the Milky Way Galaxy and the Local Group, but they are particularly abundant in starburst and interacting galaxies. The few young massive clusters that are close enough to resolve are of prime interest for studying the stellar mass function and the ecological interplay between stellar evolution and stellar dynamics. The distant unresolved clusters may be effectively used to study the star-cluster mass function, and they provide excellent constraints on the formation mechanisms of young cluster populations. Young massive clusters are expected to be the nurseries for many unusual objects, including a wide range of exotic stars and binaries. So far only a few such objects have been found in young massive clusters, although their older cousins, the…
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