Journal Article

The globular cluster system of the Sagittarius dwarf spheroidal galaxy: the age of Terzan 8

P. Montegriffo, M. Bellazzini, F. R. Ferraro, D. Martins, A. Sarajedini and F. Fusi Pecci

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 294, issue 2, pages 315-326
Published in print February 1998 | ISSN: 0035-8711
Published online February 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-8711.1998.01211.x
The globular cluster system of the Sagittarius dwarf spheroidal galaxy: the age of Terzan 8

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Abstract

We present deep V- and I-band CCD photometry of the globular cluster Terzan 8, recently found to be a member of the globular cluster system of the Sagittarius dwarf spheroidal galaxy. We accurately estimate the metallicity of Terzan 8, and provide the first direct determination of the colour excess toward this cluster. Our robust age estimate confirms that this cluster is indeed coeval with typical Galactic globulars of comparable metal content, and thus it is probably significantly older than at least two other Sagittarius clusters, Terzan 7 and Arp 2. The implications of this result on the star formation history of the Sagittarius galaxy are briefly discussed.

Keywords: globular clusters: individual: Terzan 8; Galaxy: halo; galaxies: individual: Sagittarius dwarf spheroidal; Local Group; galaxies: star clusters

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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