oMEGACat III. Multi-band photometry and metallicities reveal spatially well-mixed populations within ω Centauri's half-light radius
arxiv(2024)
摘要
ω Centauri, the most massive globular cluster in the Milky Way, has
long been suspected to be the stripped nucleus of a dwarf galaxy that fell into
the Galaxy a long time ago. There is considerable evidence for this scenario
including a large spread in metallicity and an unusually large number of
distinct sub-populations seen in photometric studies. In this work, we use new
MUSE spectroscopic and HST photometric catalogs to investigate the underlying
metallicity distributions as well as the spatial variations of the populations
within the cluster up to its half-light radius. Based on 11,050 member stars,
the [M/H] distribution has a median of (-1.614 ± 0.003) dex and a large
spread of ∼ 1.37 dex reaching from -0.67 dex to -2.04 dex for 99.7
of the stars. In addition, we show the chromosome map of the cluster, which
separates the red giant branch stars into different sub-populations, and
analyze the sub-populations of the metal-poorest component. Finally, we do not
find any metallicity gradient within the half-light radius, and the different
sub-populations are well mixed.
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