A Color-Magnitude Diagram for a Globular Cluster In the Giant Elliptical Galaxy NGC 5128

Abstract

The Hubble Space Telescope has been used to obtain WFPC2 (V,I) photometry for a large sample of stars in the outer halo of the giant elliptical NGC 5128 (d = 4 Mpc). The globular cluster N5128-C44, at the center of the Planetary Camera field, is well enough resolved to permit the construction of a color-magnitude diagram (CMD) for it which covers the brightest two magnitudes of the giant branch. The CMD is consistent with that of a normal old, moderately low-metallicity ([Fe/H] = -1.30 globular cluster, distinctly more metal-poor than most of the field halo stars at the same projected location (which average [Fe/H] ~ -0.5). This is the most distant globular cluster in which direct color-magnitude photometry has been achieved to date, and the first one belonging to a giant E galaxy.

12 pages, LaTeX, including 5 postscript figures; submitted to Astronomical Journal

References in corpus (5)

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• M87, Globular Clusters, and Galactic Winds: Issues in Giant Galaxy Formation
• NGC 2419, M92, and the Age Gradient in the Galactic Halo
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Cited by in corpus (12)

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• The Metallicity Distribution in the Halo Stars of NGC 5128: Implications for Galaxy Formation
• Near-infrared spectroscopy of nearby Seyfert galaxies. I. First results
• Testing Stellar Population Models with Star Clusters in the Large Magellanic Cloud
• Structural Parameters for Globular Clusters in NGC 5128
• Structure and Mass of a Young Globular Cluster in NGC 6946
• Globular Cluster Systems and the Missing Satellite Problem: Implications for Cold Dark Matter Models
• Structural Parameters for Globular Clusters in NGC 5128. II: HST/ACS Imaging and New Clusters
• The Mass of the Centaurus A Group of Galaxies
• Star formation history and evolution of gas-rich dwarf galaxies in the Centaurus A group
• A faint extended cluster in the outskirts of NGC 5128: evidence of a low mass accretion
• The Production Rate of SN Ia Events in Globular Clusters