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Date and Time of the Query: 2019-08-17 T15:54:31 PDT
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For refcode 2003ApJ...585..767L:
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Copyright by American Astronomical Society. Reproduced by permission
2003ApJ...585..767L Evidence for an Intermediate-Age, Metal-rich Population of Globular Clusters in NGC 43651 Soren S. Larsen and Jean P. Brodie, Michael A. Beasley and Duncan A. Forbes, Markus Kissler-Patig and Harald Kuntschner and Thomas H. Puzia Received 2002 July 24; accepted 2002 November 20 ABSTRACT We present spectroscopy for globular clusters (GCs) in the elliptical galaxy NGC 4365, obtained with the Low-Resolution Imaging 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 (H{beta}, H{gamma}, and H{delta}) on the GC spectra support recent suggestions by Puzia et al. on the basis of optical and near-infrared photometry that some of the clusters in NGC 4365 are intermediate-age (2-5 Gyr) and metal-rich (-0.4 <~ [Z/H] <~ 0) rather than old (~10-15 Gyr) 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. Subject headings: galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: individual (NGC 4365) - globular clusters: general
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