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28 March 2024
 
  » arxiv » astro-ph/0211434

 Article overview


Evidence for An Intermediate-Age, Metal-rich Population of Globular Clusters in NGC 4365
S. S. Larsen ; J. P. Brodie ; M. A. Beasley ; D. A. Forbes ; M. Kissler-Patig ; H. Kuntschner ; T. H. Puzia ;
Date 19 Nov 2002
Journal Astrophys.J. 585 (2003) 767-774
Subject astro-ph
Affiliation UCO / Lick Observatory, Swinburne University, ESO, Sternwarte Munich
AbstractWe 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.
Source arXiv, astro-ph/0211434
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