Bona-fide Globular Clusters or objects with galactic origin?

SESTO, LEANDRO; ESCUDERO, CARLOS; FAIFER, FAVIO; REYNALDI, VICTORIA

cordoba

Congreso; XII Friends of Friends Meeting Linking astronomy and friends in Córdoba; 2023

Instituto de Astronomía Teórica y Experimental (IATE) y Observatorio Astronómico de la Universidad Nacional de Córdoba (OAC)

Ultracompact dwarf (UCDs, Hilker+ 1999 and Drinkwater+ 2000) are a type of compact stellar system that lies in the mass-size parameter space between globularclusters (GC) and compact elliptical galaxies (cEs). Although their physical properties do not have a precise definition, we could say that in a broad sense they areobjects with Mv<-9 , stellar masses > 10 6 M☉ (Forbes+ 2020) and with effective radii between Reff = 3 and 100 pc (Wittmann+ 2016).Thus, the set of objects called UCD includes both, massive GCs (e. g. Faifer+ 2017) and nuclei of tidally stripped dwarf galaxies (e. g. Norris+ 2015), in some cases,differentiating between them is not trivial. In this work, we analyze the most relevant physical properties of two stellar clusters with signs of recent stellar formation,aiming to classify them as massive GCs, or nuclei of dwarf galaxies.