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

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

1998-06-30

arxiv.org/abs/astro-ph/9806390v1

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1086/300651

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.

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