Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/69747

Title

A color-magnitude diagram for a globular cluster in the giant elliptical galaxy NGC 5128

Author(s)

Harris, Gretchen L. H.;  Poole, G. B.;  Harris, William E.

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 similar or equal to 4 Mpc). The target region is located at a projected distance 21 kpc from the center of NGC 5128. 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 that covers the brightest 2 mag of the giant branch. The CMD is consistent with that of a normal old, intermediate-metallicity ([Fe/H]D[1.3) globular cluster, distinctly more metal poor than most of the field halo stars at the same projected location (which average [Fe/H]D[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.

Publication type

Journal article

Source

Astronomical Journal, Vol. 116 (Dec 1998), pp. 2866-2872

Publication year

1998

Keyword(s)

Elliptical galaxies;  Lenticular galaxies;  Star clusters

Publisher

University of Chicago Press

ISSN

0004-6256

Publisher URL

http://dx.doi.org/10.1086/300651

Copyright

Copyright © 1998 The American Astronomical Society. All rights reserved. The American Astronomical Society does not allow institutions to archive either the accepted manuscript or the published version of the article. However, you can find an earlier version of the full text here: http://arxiv.org/abs/astro-ph/9806390.

Peer reviewed