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

Young Wook Lee, Hansung B. Gim, Chul Chung

Research output: Contribution to journalConference articlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)129-133
Number of pages5
JournalAstrophysics and Space Science Proceedings
Issue number202439
DOIs
Publication statusPublished - 2009
EventInternational Conference on Ultraviolet Properties of Evolved Stellar Populations, 2007 - Puerto Vallarta, Mexico
Duration: 2007 Apr 162007 Apr 20

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Computer Science Applications
  • Spectroscopy
  • Space and Planetary Science
  • Nuclear and High Energy Physics

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