Koposov, Sergey; Gilmore, Gerard; Walker, Matthew; Belokurov, V; Wyn Evans, N; Fellhauer, M; Gieren, W; Geisler, D; Monaco, L; Norris, John; Okamoto, S; Penarrubia, J; Walker, M; Monaco, Lorenzo
We develop, implement, and characterize an enhanced data reduction approach which delivers precise, accurate, radial velocities from moderate resolution spectroscopy with the fiber-fed VLT/FLAMES+GIRAFFE facility. This facility, with appropriate care, delivers radial velocities adequate to resolve the intrinsic velocity dispersions of the very faint dwarf spheroidal (dSph) galaxies. Importantly, repeated measurements let us reliably calibrate our individual velocity errors (0.2 kms-1 ≤ δV ≤...[Show more]
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