Nuclear clusters in dwarf irregular galaxies and their connection to massive galactic clusters

Georgiev, Iskren Y., Hilker, Michael, Puzia, Thomas H., Goudfrooij, Paul and Baumgardt, Holger (2009). Nuclear clusters in dwarf irregular galaxies and their connection to massive galactic clusters. In: Richard de Grijs and Jacques Lépine, Star clusters: Basic galactic building blocks throughout time and space. IAU Symposium 266. Star Clusters: Basic Galactic Building Blocks Throughout Time And Space, Rio de Janeiro, Brazil, (401-401). 10-14 August 2009. doi:10.1017/S1743921309991499


Author Georgiev, Iskren Y.
Hilker, Michael
Puzia, Thomas H.
Goudfrooij, Paul
Baumgardt, Holger
Title of paper Nuclear clusters in dwarf irregular galaxies and their connection to massive galactic clusters
Conference name IAU Symposium 266. Star Clusters: Basic Galactic Building Blocks Throughout Time And Space
Conference location Rio de Janeiro, Brazil
Conference dates 10-14 August 2009
Proceedings title Star clusters: Basic galactic building blocks throughout time and space   Check publisher's open access policy
Journal name Proceedings of the International Astronomical Union   Check publisher's open access policy
Place of Publication Cambridge, U.K.
Publisher Cambridge University Press
Publication Year 2009
Sub-type Published abstract
DOI 10.1017/S1743921309991499
Open Access Status
ISBN 9780521764995
0521764998
ISSN 1743-9213
1743-9221
Editor Richard de Grijs
Jacques Lépine
Volume 5
Issue S266
Start page 401
End page 401
Total pages 1
Language eng
Formatted Abstract/Summary
We compare nuclear globular clusters (nGCs) in dwarf galaxies and Galactic GCs with extended (hot) horizontal branches (EHB–GCs) to test the suggested external origin of the latter and the conditions under which GC self-enrichment can operate. We show that the present-day escape velocity (𝑣esc) of stellar ejecta to reach the cluster tidal radius compares with those of EHB–GCs. For EHB–GCs, we find a correlation between the present-day 𝑣esc and their metallicity as well as (𝑣 − I) colour. The similar 𝑣esc and (𝑣 − I) distribution of nGCs and EHB–GCs implies that nGCs could also have complex stellar populations. The 𝑣esc–[Fe/H] relation could reflect the known relation of increasing stellar-wind velocity with metallicity, which in turn explains why more metal-poor clusters typically show more peculiarities in their stellar population than more metal-rich clusters of the same mass.
Keyword Galaxies: star clusters
Galaxies: dwarf
Galaxies: nuclei
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Publication date: 01 Aug 2009.

Document type: Conference Paper
Collections: School of Mathematics and Physics
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