Two distinct red giant branch populations in the globular cluster NGC 2419 as tracers of a merger event in the Milky Way

Young-Wook Lee, Sang-Il Han, Seok-Joo Joo +7

Recent spectroscopic observations of the outer halo globular cluster (GC) NGC 2419 show that it is unique among GCs, in terms of chemical abundance patterns, and some suggest that…