Giovedi 5 Settembre 2019, h. 11:30 

 Aula L. Rosino Dipartimento di Fisica e Astronomia

Suk-Jin Yoon 

Yonsei University, South Korea

Globular Cluster Color Bimodality




The colors of globular clusters (GCs) in most large elliptical galaxies are bimodal. This has long been viewed as evidence for the presence of two GC subpopulations having different geneses within individual galaxies. However, Yoon et al. (2006, Science) showed that, because of the nonlinear nature of the metallicity-to-color transformation, a coeval group of old GCs with a unimodal metallicity spread can exhibit color bimodality. The scenario gives simple and cohesive explanations for all the key observations and could simplify theories of elliptical galaxy formation. In this talk, I review the 13-year debate on the origin of the bimodality and present 13 papers in a series of mine defending our theory. I also briefly mention other researches I have been working on with my group.




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