Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-19
Astrophys.J. 585 (2003) 767-774
Astronomy and Astrophysics
Astrophysics
19 pages, including 6 figures and 3 tables. Accepted for publication in ApJ
Scientific paper
10.1086/346219
We present spectroscopy for globular clusters (GCs) in the elliptical galaxy NGC 4365, obtained with the LRIS spectrograph on the Keck I telescope. Previous studies have shown that the optical color distribution of GCs in NGC 4365 lacks the bimodal structure that is common in globular cluster systems, showing only a single broad peak. Measurements of Balmer line indices (Hbeta, Hgamma and Hdelta) on the GC spectra support recent suggestions by Puzia et al., based on optical and near-infrared photometry, that some of the clusters in NGC 4365 are intermediate-age (2-5 Gyrs) and metal-rich (-0.4<[Z/H]<0) rather than old (~10-15 Gyrs) and metal-poor. We also find some genuinely metal-poor, old clusters, suggesting that the ages and metallicities of the two populations conspire to produce the single broad distribution observed in optical colors.
Beasley Matthew A.
Brodie Jean P.
Forbes Duncan A.
Kissler-Patig Markus
Kuntschner Harald
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