First detection of the RGB-bump in the Sagittarius dSph

Details First detection of the RGB-bump in the Sagittarius dSph First detection of the RGB-bump in the Sagittarius dSph

2002-08-30

arxiv.org/abs/astro-ph/0208581v1

Astrophys.J.578:L47-L50,2002

Astronomy and Astrophysics

Astrophysics

14 pages, 4 figures, accepted by ApJ Letters

Scientific paper

10.1086/344503

We present V, I photometry of the Sagittarius Dwarf Spheroidal galaxy (Sgr) for a region of ~ 1^{circ} times 1^{circ}, centered on the globular cluster M 54. This catalog is the largest database of stars (~500,000) ever obtained for this galaxy. The wide area covered allows us to measure for the first time the position of the RGB-bump, a feature that has been identified in most Galactic globular clusters and only recently in a few galaxies of the Local Group. The presence of a single-peaked bump in the RGB differential Luminosity Function confirms that there is a dominant population in Sgr (Pop A). The photometric properties of the Pop A RGB and the position of the RGB bump have been used to constrain the range of possible ages and metallicities of this population. The most likely solution lies in the range -0.6 < [M/H] <= -0.4 and 4 Gyr <= age <= 8 Gyr.

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