Globular clusters with the extended horizontal-branch as remaining cores of galaxy building blocks

Details Globular clusters with the extended horizontal-branch as remaining cores of galaxy building blocks Globular clusters with the extended horizontal-branch as remaining cores of galaxy building blocks

2007-07-11

arxiv.org/abs/0707.1705v1

Astronomy and Astrophysics

Astrophysics

Invited paper presented at the conference "New Quests in Stellar Astrophysics II: Ultraviolet Properties of Evolved Stellar Po

Scientific paper

The relics of building blocks that made stellar halo and bulge are yet to be discovered unless they were completely disrupted throughout the history of the Galaxy. Here we suggest that about 25% of the Milky Way globular clusters have characteristics of the remaining cores of these early building blocks rather than genuine star clusters. They are clearly distinct from other normal globular clusters in the presence of extended horizontal-branch and multiple stellar populations, in mass (brightness), and most importantly in orbital kinematics. Based on this result, a three-stage formation picture of the Milky Way is suggested, which includes early mergers, collapse, and later accretion.

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