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Clusters and the Galactic Halo

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Dynamics of Young Star Clusters and Associations

Part of the book series: Saas-Fee Advanced Course ((SAASFEE,volume 42))

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Abstract

The Galactic Halo has long ceased to be a site of active star formation, but, as the first members of the Milky Way, halo stars have played a crucial role in probing the initial stages of galaxy formation. In particular, this year sees the fiftieth anniversary of one of the seminal works in that field, an analysis of the motions of a relatively small sample of high-velocity, metal-poor stars by Olin Eggen, Donald Lynden-Bell and Allan Sandage (ELS). This chapter aims to put that analysis in context, describing the developing understanding of the nature of the halo and the subsequent impact of the ELS results for modeling galaxy formation. Globular clusters are the most prominent constituent of the halo. Long considered simple systems, the product of a single star-forming event, recent observations have shown that most, perhaps all, are multi-population systems, incorporating chemically distinct stellar components. We discuss the implications for the earliest stages of star formation in the Milky Way and other galaxies.

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Authors and Affiliations

  1. Space Telescope Science Institute, Baltimore, MD, USA

    I. Neill Reid

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  1. I. Neill Reid
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Correspondence to I. Neill Reid .

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Editors and Affiliations

  1. Institute for Astronomy,ETH, Zürich, Switzerland

    Michael R. Meyer

  2. Department of Astronomy of Geneva Univer, Geneva Observatory, Sauverny, Switzerland

    Laurent Eyer

  3. Department of Physics & Astronomy, University of Rochester, Rochester, USA

    Cameron P.M. Bell

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Reid, I.N. (2015). Clusters and the Galactic Halo. In: Meyer, M., Eyer, L., Bell, C. (eds) Dynamics of Young Star Clusters and Associations. Saas-Fee Advanced Course, vol 42. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-47290-3_18

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  • DOI: https://doi.org/10.1007/978-3-662-47290-3_18

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  • Print ISBN: 978-3-662-47289-7

  • Online ISBN: 978-3-662-47290-3

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