Compact stellar systems and cluster environments

Firth, P., Drinkwater, M.J. and Karick, A.M. (2008) Compact stellar systems and cluster environments. Monthly Notices of the Royal Astronomical Society, 389 4: 1539-1555. doi:10.1111/j.1365-2966.2008.13651.x

Author Firth, P.
Drinkwater, M.J.
Karick, A.M.
Title Compact stellar systems and cluster environments
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 1365-2966
Publication date 2008-06-27
Year available 2008
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2008.13651.x
Open Access Status DOI
Volume 389
Issue 4
Start page 1539
End page 1555
Total pages 17
Editor Fabian, A.C.
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Abstract We have extended the search for luminous compact stellar systems (CSSs) in the Virgo and Fornax galaxy clusters by targeting with the recently commissioned AAOmega spectrograph three cluster environments – the cluster cores around M87 and NGC 1399, intracluster space and a major galaxy merger site (NGC 1316). We have significantly increased the number of redshift-confirmed CSSs in the Virgo cluster core and located three Virgo intracluster globular clusters (IGCs) at a large distance from M87 (154–173 arcmin or ∼750– 850 kpc ) – the first isolated IGCs to be redshift confirmed. We estimate luminous CSS populations in each cluster environment, and compare their kinematic and photometric properties. We find that (1) the estimated luminous CSS population in the Virgo cluster core is half of that in Fornax, possibly reflecting the more relaxed dynamical status of the latter; (2) in both clusters the luminous CSS velocity dispersions are less than those of the cD galaxy globular cluster (GC) system or cluster dwarf elliptical (dE) galaxies, suggesting luminous CSSs have less energetic orbits; (3) Fornax has a subpopulation of cluster core luminous CSSs that are redder and presumably more metal rich than those found in Virgo; (4) no luminous CSSs were found in a 10–20 arcmin (60–130 kpc) radial arc east of the 3-Gyr-old NGC 1316 galaxy merger remnant or in the adjacent intracluster region, implying that any luminous CSSs created in the galaxy merger have not been widely dispersed.
Keyword Astronomy & Astrophysics
Astronomy & Astrophysics
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID W-7405-Eng-48
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 17 times in Scopus Article | Citations
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Created: Wed, 25 Mar 2009, 21:31:37 EST by Jo Hughes on behalf of School of Mathematics & Physics