Keck Spectroscopy of Red Giant Stars in the Vicinity of M31's Massive Globular Cluster G1

Details Keck Spectroscopy of Red Giant Stars in the Vicinity of M31's Massive Globular Cluster G1 Keck Spectroscopy of Red Giant Stars in the Vicinity of M31's Massive Globular Cluster G1

2003-09-10

arxiv.org/abs/astro-ph/0309295v3

Astronomy and Astrophysics

Astrophysics

11 pages, 2 figures, accepted for publication in the AJ

Scientific paper

10.1086/382517

We present results from a Keck spectroscopic survey of red giants in a field near M31's major axis, ~34kpc in projection from the nucleus, near the globular cluster G1. We use multislit LRIS spectroscopy to measure the CaII triplet in 41 stars with apparent mags 20=-0.8 for these potential M31 outer disk stars. Six of the 23 M31 members v and [Fe/H] values consistent with those of G1 (after accounting forits intrinsic spread in both): one of these stars lies within G1's projected tidal radius and is a likely member; the remaining 5 stars are not physically close to G1 but may represent its tidal debris. More data are needed to confirm the nature of these 5 stars as it is likely that they represent M31's smooth halo population. We might have expected to detect tidal debris if G1 were the remnant core of a dwarf galaxy being accreted by M31; instead, the majority of M31 giants in this field are metal-rich and belong to what is evidently the outer disk of M31, and only a small fraction (<~20%) could possibly have originated in G1.

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