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Mapping out the origins of compact stellar systems

Published online by Cambridge University Press:  31 March 2017

Aaron J. Romanowsky ,
Jean P. Brodie  and
the SAGES
Aaron J. Romanowsky
Affiliation:
Department of Physics & Astronomy, San José State University, San Jose, CA 95192, USA email: aaron.romanowsky@sjsu.edu University of California Observatories, 1156 High Street, Santa Cruz, CA 95064, USA email: jbrodie@ucsc.edu
Jean P. Brodie
Affiliation:
University of California Observatories, 1156 High Street, Santa Cruz, CA 95064, USA email: jbrodie@ucsc.edu
the SAGES
Affiliation:
http://sages.ucolick.org
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Abstract

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We present a suite of extragalactic explorations of the origins and nature of globular clusters (GCs) and ultra-compact dwarfs (UCDs), and the connections between them. An example of GC metallicity bimodality is shown to reflect underlying, distinct metal-poor and metal-rich stellar halo populations. Metallicity-matching methods are used to trace the birth sites and epochs of GCs in giant E/S0s, pointing to clumpy disk galaxies at z ~ 3 for the metal-rich GCs, and to a combination of accreted and in-situ formation modes at z ~ 5–6 for the metal-poor GCs. An increasingly diverse zoo of compact stellar systems is being discovered, including objects that bridge the gaps between UCDs and faint fuzzies, and between UCDs and compact ellipticals. Many of these have properties pointing to origins as the stripped nuclei of larger galaxies, and a smoking-gun example is presented of an ω Cen-like star cluster embedded in a tidal stream.

Keywords

galaxies: star clustersgalaxies: nucleigalaxies: halos
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 105 - 110
Copyright
Copyright © International Astronomical Union 2017 

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